{"id":1371,"date":"2024-06-02T22:25:11","date_gmt":"2024-06-02T22:25:11","guid":{"rendered":""},"modified":"2024-06-05T03:09:46","modified_gmt":"2024-06-04T19:09:46","slug":"underscore-%e7%b3%bb%e5%88%97%e4%b9%8b%e5%a6%82%e4%bd%95%e5%86%99%e8%87%aa%e5%b7%b1%e7%9a%84-underscore","status":"publish","type":"post","link":"https:\/\/www.lccc.top\/?p=1371","title":{"rendered":"underscore \u7cfb\u5217\u4e4b\u5982\u4f55\u5199\u81ea\u5df1\u7684 underscore"},"content":{"rendered":"\n

\u524d\u8a00<\/h2>\n

\u5728 \u300aJavaScript \u4e13\u9898\u7cfb\u5217\u300b<\/a> \u4e2d\uff0c\u6211\u4eec\u5199\u4e86\u5f88\u591a\u7684\u529f\u80fd\u51fd\u6570\uff0c\u6bd4\u5982\u9632\u6296\u3001\u8282\u6d41\u3001\u53bb\u91cd\u3001\u7c7b\u578b\u5224\u65ad\u3001\u6241\u5e73\u6570\u7ec4\u3001\u6df1\u6d45\u62f7\u8d1d\u3001\u67e5\u627e\u6570\u7ec4\u5143\u7d20\u3001\u901a\u7528\u904d\u5386\u3001\u67ef\u91cc\u5316\u3001\u51fd\u6570\u7ec4\u5408\u3001\u51fd\u6570\u8bb0\u5fc6\u3001\u4e71\u5e8f\u7b49\uff0c\u53ef\u4ee5\u6211\u4eec\u8be5\u5982\u4f55\u7ec4\u7ec7\u8fd9\u4e9b\u51fd\u6570\uff0c\u5f62\u6210\u81ea\u5df1\u7684\u4e00\u4e2a\u5de5\u5177\u51fd\u6570\u5e93\u5462\uff1f\u8fd9\u4e2a\u65f6\u5019\uff0c\u6211\u4eec\u5c31\u8981\u501f\u9274 underscore \u662f\u600e\u4e48\u505a\u7684\u4e86\u3002<\/p>\n

\u81ea\u5df1\u5b9e\u73b0<\/h2>\n

\u5982\u679c\u662f\u6211\u4eec\u81ea\u5df1\u53bb\u7ec4\u7ec7\u8fd9\u4e9b\u51fd\u6570\uff0c\u6211\u4eec\u8be5\u600e\u4e48\u505a\u5462\uff1f\u6211\u60f3\u6211\u4f1a\u8fd9\u6837\u505a\uff1a<\/p>\n

<\/p>\n
(<\/span>function<\/span>(<\/span>)<\/span>{<\/span>\n    var<\/span> root<\/span> =<\/span> this<\/span>;<\/span>\n\n    var<\/span> _<\/span> =<\/span> {<\/span>}<\/span>;<\/span>\n\n    root<\/span>.<\/span>_<\/span> =<\/span> _<\/span>;<\/span>\n\n    \/\/ \u5728\u8fd9\u91cc\u6dfb\u52a0\u81ea\u5df1\u7684\u65b9\u6cd5<\/span>\n    _<\/span>.<\/span>reverse<\/span> =<\/span> function<\/span>(<\/span>string<\/span>)<\/span>{<\/span>\n        return<\/span> string<\/span>.<\/span>split<\/span>(<\/span>''<\/span>)<\/span>.<\/span>reverse<\/span>(<\/span>)<\/span>.<\/span>join<\/span>(<\/span>''<\/span>)<\/span>;<\/span>\n    }<\/span>\n\n}<\/span>)<\/span>(<\/span>)<\/span>\n\n_<\/span>.<\/span>reverse<\/span>(<\/span>'hello'<\/span>)<\/span>;<\/span>\n=><\/span> 'olleh'<\/span><\/pre>\n<\/div>\n
\u6211\u4eec\u5c06\u6240\u6709\u7684\u65b9\u6cd5\u6dfb\u52a0\u5230\u4e00\u4e2a\u540d\u4e3a _<\/code> \u7684\u5bf9\u8c61\u4e0a\uff0c\u7136\u540e\u5c06\u8be5\u5bf9\u8c61\u6302\u8f7d\u5230\u5168\u5c40\u5bf9\u8c61\u4e0a\u3002<\/p>\n
\u4e4b\u6240\u4ee5\u4e0d\u76f4\u63a5 window._ = _<\/code> \u662f\u56e0\u4e3a\u6211\u4eec\u5199\u7684\u662f\u4e00\u4e2a\u5de5\u5177\u51fd\u6570\u5e93\uff0c\u4e0d\u4ec5\u8981\u6c42\u53ef\u4ee5\u8fd0\u884c\u5728\u6d4f\u89c8\u5668\u7aef\uff0c\u8fd8\u53ef\u4ee5\u8fd0\u884c\u5728\u8bf8\u5982 Node \u7b49\u73af\u5883\u4e2d\u3002<\/p>\n
root<\/h2>\n
\u7136\u800c underscore \u53ef\u4e0d\u4f1a\u5199\u5f97\u5982\u6b64\u7b80\u5355\uff0c\u6211\u4eec\u4ece var root = this<\/code> \u5f00\u59cb\u8bf4\u8d77\u3002<\/p>\n
\u4e4b\u6240\u4ee5\u5199\u8fd9\u4e00\u53e5\uff0c\u662f\u56e0\u4e3a\u6211\u4eec\u8981\u901a\u8fc7 this \u83b7\u5f97\u5168\u5c40\u5bf9\u8c61\uff0c\u7136\u540e\u5c06 _<\/code> \u5bf9\u8c61\uff0c\u6302\u8f7d\u4e0a\u53bb\u3002<\/p>\n
\u7136\u800c\u5728\u4e25\u683c\u6a21\u5f0f\u4e0b\uff0cthis \u8fd4\u56de undefined\uff0c\u800c\u4e0d\u662f\u6307\u5411 Window\uff0c\u5e78\u8fd0\u7684\u662f underscore \u5e76\u6ca1\u6709\u91c7\u7528\u4e25\u683c\u6a21\u5f0f\uff0c\u53ef\u662f\u5373\u4fbf\u5982\u6b64\uff0c\u4e5f\u4e0d\u80fd\u907f\u514d\uff0c\u56e0\u4e3a\u5728 ES6 \u4e2d\u6a21\u5757\u811a\u672c\u81ea\u52a8\u91c7\u7528\u4e25\u683c\u6a21\u5f0f\uff0c\u4e0d\u7ba1\u6709\u6ca1\u6709\u58f0\u660e use strict<\/code>\u3002<\/p>\n
\u5982\u679c this \u8fd4\u56de undefined\uff0c\u4ee3\u7801\u5c31\u4f1a\u62a5\u9519\uff0c\u6240\u4ee5\u6211\u4eec\u7684\u601d\u8def\u662f\u5bf9\u73af\u5883\u8fdb\u884c\u68c0\u6d4b\uff0c\u7136\u540e\u6302\u8f7d\u5230\u6b63\u786e\u7684\u5bf9\u8c61\u4e0a\u3002\u6211\u4eec\u4fee\u6539\u4e00\u4e0b\u4ee3\u7801\uff1a<\/p>\n
<\/p>\n
var<\/span> root<\/span> =<\/span> (<\/span>typeof<\/span> window<\/span> ==<\/span> 'object'<\/span> &&<\/span> window<\/span>.<\/span>window<\/span> ==<\/span> window<\/span> &&<\/span> window<\/span>)<\/span> ||<\/span>\n           (<\/span>typeof<\/span> global<\/span> ==<\/span> 'object'<\/span> &&<\/span> global<\/span>.<\/span>global<\/span> ==<\/span> global<\/span> &&<\/span> global<\/span>)<\/span>;<\/span><\/pre>\n<\/div>\n
\u5728\u8fd9\u6bb5\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u5224\u65ad\u4e86\u6d4f\u89c8\u5668\u548c Node \u73af\u5883\uff0c\u53ef\u662f\u53ea\u6709\u8fd9\u4e24\u4e2a\u73af\u5883\u5417\uff1f\u90a3\u6211\u4eec\u6765\u770b\u770b Web Worker\u3002<\/p>\n
Web Worker<\/h2>\n
Web Worker \u5c5e\u4e8e HTML5 \u4e2d\u7684\u5185\u5bb9\uff0c\u5f15\u7528\u300aJavaScript\u6743\u5a01\u6307\u5357\u300b\u4e2d\u7684\u8bdd\u5c31\u662f\uff1a<\/p>\n
\n
\u5728 Web Worker \u6807\u51c6\u4e2d\uff0c\u5b9a\u4e49\u4e86\u89e3\u51b3\u5ba2\u6237\u7aef JavaScript \u65e0\u6cd5\u591a\u7ebf\u7a0b\u7684\u95ee\u9898\u3002\u5176\u4e2d\u5b9a\u4e49\u7684 \u201cworker\u201d \u662f\u6307\u6267\u884c\u4ee3\u7801\u7684\u5e76\u884c\u8fc7\u7a0b\u3002\u4e0d\u8fc7\uff0cWeb Worker \u5904\u5728\u4e00\u4e2a\u81ea\u5305\u542b\u7684\u6267\u884c\u73af\u5883\u4e2d\uff0c\u65e0\u6cd5\u8bbf\u95ee Window \u5bf9\u8c61\u548c Document \u5bf9\u8c61\uff0c\u548c\u4e3b\u7ebf\u7a0b\u4e4b\u95f4\u7684\u901a\u4fe1\u4e1a\u53ea\u80fd\u901a\u8fc7\u5f02\u6b65\u6d88\u606f\u4f20\u9012\u673a\u5236\u6765\u5b9e\u73b0\u3002<\/p>\n<\/blockquote>\n
\u4e3a\u4e86\u6f14\u793a Web Worker \u7684\u6548\u679c\uff0c\u6211\u5199\u4e86\u4e00\u4e2a demo\uff0c\u67e5\u770b\u4ee3\u7801<\/a>\u3002<\/p>\n
\u5728 Web Worker \u4e2d\uff0c\u662f\u65e0\u6cd5\u8bbf\u95ee Window \u5bf9\u8c61\u7684\uff0c\u6240\u4ee5 typeof window<\/code> \u548c typeof global<\/code> \u7684\u7ed3\u679c\u90fd\u662f undefined<\/code>\uff0c\u6240\u4ee5\u6700\u7ec8 root \u7684\u503c\u4e3a false\uff0c\u5c06\u4e00\u4e2a\u57fa\u672c\u7c7b\u578b\u7684\u503c\u50cf\u5bf9\u8c61\u4e00\u6837\u6dfb\u52a0\u5c5e\u6027\u548c\u65b9\u6cd5\uff0c\u81ea\u7136\u662f\u4f1a\u62a5\u9519\u7684\u3002<\/p>\n
\u90a3\u4e48\u6211\u4eec\u8be5\u600e\u4e48\u529e\u5462\uff1f<\/p>\n
\u867d\u7136\u5728 Web Worker \u4e2d\u4e0d\u80fd\u8bbf\u95ee\u5230 Window \u5bf9\u8c61\uff0c\u4f46\u662f\u6211\u4eec\u5374\u80fd\u901a\u8fc7 self \u8bbf\u95ee\u5230 Worker \u73af\u5883\u4e2d\u7684\u5168\u5c40\u5bf9\u8c61\u3002\u6211\u4eec\u53ea\u662f\u8981\u627e\u5168\u5c40\u53d8\u91cf\u6302\u8f7d\u800c\u5df2\uff0c\u6240\u4ee5\u5b8c\u5168\u53ef\u4ee5\u6302\u5230 self \u4e2d\u561b\u3002<\/p>\n
\u800c\u4e14\u5728\u6d4f\u89c8\u5668\u4e2d\uff0c\u9664\u4e86 window \u5c5e\u6027\uff0c\u6211\u4eec\u4e5f\u53ef\u4ee5\u901a\u8fc7 self \u5c5e\u6027\u76f4\u63a5\u8bbf\u95ee\u5230 Winow \u5bf9\u8c61\u3002<\/p>\n
<\/p>\n
console<\/span>.<\/span>log<\/span>(<\/span>window<\/span>.<\/span>window<\/span> ===<\/span> window<\/span>)<\/span>;<\/span> \/\/ true<\/span>\nconsole<\/span>.<\/span>log<\/span>(<\/span>window<\/span>.<\/span>self<\/span> ===<\/span> window<\/span>)<\/span>;<\/span> \/\/ true<\/span><\/pre>\n<\/div>\n
\u8003\u8651\u5230\u4f7f\u7528 self \u8fd8\u53ef\u4ee5\u989d\u5916\u652f\u6301 Web Worker\uff0c\u6211\u4eec\u76f4\u63a5\u5c06\u4ee3\u7801\u6539\u6210 self\uff1a<\/p>\n
<\/p>\n
var<\/span> root<\/span> =<\/span> (<\/span>typeof<\/span> self<\/span> ==<\/span> 'object'<\/span> &&<\/span> self<\/span>.<\/span>self<\/span> ==<\/span> self<\/span> &&<\/span> self<\/span>)<\/span> ||<\/span>\n           (<\/span>typeof<\/span> global<\/span> ==<\/span> 'object'<\/span> &&<\/span> global<\/span>.<\/span>global<\/span> ==<\/span> global<\/span> &&<\/span> global<\/span>)<\/span>;<\/span><\/pre>\n<\/div>\n
node vm<\/h2>\n
\u5230\u4e86\u8fd9\u91cc\uff0c\u4f9d\u7136\u6ca1\u5b8c\uff0c\u8ba9\u4f60\u60f3\u4e0d\u5230\u7684\u662f\uff0c\u5728 node \u7684 vm \u6a21\u5757\u4e2d\uff0c\u4e5f\u5c31\u662f\u6c99\u76d2\u6a21\u5757\uff0crunInContext \u65b9\u6cd5\u4e2d\uff0c\u662f\u4e0d\u5b58\u5728 window\uff0c\u4e5f\u4e0d\u5b58\u5728 global \u53d8\u91cf\u7684\uff0c\u67e5\u770b\u4ee3\u7801<\/a>\u3002<\/p>\n
\u4f46\u662f\u6211\u4eec\u5374\u53ef\u4ee5\u901a\u8fc7 this \u8bbf\u95ee\u5230\u5168\u5c40\u5bf9\u8c61\uff0c\u6240\u4ee5\u5c31\u6709\u4eba\u53d1\u8d77\u4e86\u4e00\u4e2a PR\uff0c\u4ee3\u7801\u6539\u6210\u4e86\uff1a<\/p>\n
<\/p>\n
var<\/span> root<\/span> =<\/span> (<\/span>typeof<\/span> self<\/span> ==<\/span> 'object'<\/span> &&<\/span> self<\/span>.<\/span>self<\/span> ==<\/span> self<\/span> &&<\/span> self<\/span>)<\/span> ||<\/span>\n           (<\/span>typeof<\/span> global<\/span> ==<\/span> 'object'<\/span> &&<\/span> global<\/span>.<\/span>global<\/span> ==<\/span> global<\/span> &&<\/span> global<\/span>)<\/span> ||<\/span>\n           this<\/span>;<\/span><\/pre>\n<\/div>\n
\u5fae\u4fe1\u5c0f\u7a0b\u5e8f<\/h2>\n
\u5230\u4e86\u8fd9\u91cc\uff0c\u8fd8\u662f\u6ca1\u5b8c\uff0c\u8f6e\u5230\u5fae\u4fe1\u5c0f\u7a0b\u5e8f\u767b\u573a\u4e86\u3002<\/p>\n
\u56e0\u4e3a\u5728\u5fae\u4fe1\u5c0f\u7a0b\u5e8f\u4e2d\uff0cwindow \u548c global \u90fd\u662f undefined\uff0c\u52a0\u4e0a\u53c8\u5f3a\u5236\u4f7f\u7528\u4e25\u683c\u6a21\u5f0f\uff0cthis \u4e3a undefined\uff0c\u6302\u8f7d\u5c31\u4f1a\u53d1\u751f\u9519\u8bef\uff0c\u6240\u4ee5\u5c31\u6709\u4eba\u53c8\u53d1\u4e86\u4e00\u4e2a PR\uff0c\u4ee3\u7801\u53d8\u6210\u4e86\uff1a<\/p>\n
<\/p>\n
var<\/span> root<\/span> =<\/span> (<\/span>typeof<\/span> self<\/span> ==<\/span> 'object'<\/span> &&<\/span> self<\/span>.<\/span>self<\/span> ==<\/span> self<\/span> &&<\/span> self<\/span>)<\/span> ||<\/span>\n           (<\/span>typeof<\/span> global<\/span> ==<\/span> 'object'<\/span> &&<\/span> global<\/span>.<\/span>global<\/span> ==<\/span> global<\/span> &&<\/span> global<\/span>)<\/span> ||<\/span>\n           this<\/span> ||<\/span>\n           {<\/span>}<\/span>;<\/span><\/pre>\n<\/div>\n
\u8fd9\u5c31\u662f\u73b0\u5728 v1.8.3 \u7684\u6837\u5b50\u3002<\/p>\n
\u867d\u7136\u4f5c\u8005\u53ef\u4ee5\u76f4\u63a5\u8bb2\u89e3\u6700\u7ec8\u7684\u4ee3\u7801\uff0c\u4f46\u662f\u4f5c\u8005\u66f4\u5e0c\u671b\u5e26\u7740\u5927\u5bb6\u770b\u770b\u8fd9\u770b\u4f3c\u666e\u901a\u7684\u4ee3\u7801\u662f\u5982\u4f55\u4e00\u6b65\u6b65\u6f14\u53d8\u6210\u8fd9\u6837\u7684\uff0c\u4e5f\u5e0c\u671b\u544a\u8bc9\u5927\u5bb6\uff0c\u4ee3\u7801\u7684\u5065\u58ee\u6027\uff0c\u5e76\u975e\u4e00\u8e74\u800c\u5c31\uff0c\u800c\u662f\u6c47\u96c6\u4e86\u5f88\u591a\u4eba\u7684\u7ecf\u9a8c\uff0c\u8003\u8651\u5230\u4e86\u5f88\u591a\u6211\u4eec\u610f\u60f3\u4e0d\u5230\u7684\u5730\u65b9\uff0c\u8fd9\u4e5f\u662f\u5f00\u6e90\u9879\u76ee\u7684\u597d\u5904\u5427\u3002<\/p>\n
\u51fd\u6570\u5bf9\u8c61<\/h2>\n
\u73b0\u5728\u6211\u4eec\u8bb2\u7b2c\u4e8c\u53e5 var _ = {};<\/code>\u3002<\/p>\n
\u5982\u679c\u4ec5\u4ec5\u8bbe\u7f6e _ \u4e3a\u4e00\u4e2a\u7a7a\u5bf9\u8c61\uff0c\u6211\u4eec\u8c03\u7528\u65b9\u6cd5\u7684\u65f6\u5019\uff0c\u53ea\u80fd\u4f7f\u7528 _.reverse('hello')<\/code> \u7684\u65b9\u5f0f\uff0c\u5b9e\u9645\u4e0a\uff0cunderscore \u4e5f\u652f\u6301\u7c7b\u4f3c\u9762\u5411\u5bf9\u8c61\u7684\u65b9\u5f0f\u8c03\u7528\uff0c\u5373\uff1a<\/p>\n
\n
_<\/span>(<\/span>'hello'<\/span>)<\/span>.<\/span>reverse<\/span>(<\/span>)<\/span>;<\/span> \/\/ 'olleh'<\/span><\/pre>\n<\/div>\n
\u518d\u4e3e\u4e2a\u4f8b\u5b50\u6bd4\u8f83\u4e0b\u4e24\u79cd\u8c03\u7528\u65b9\u5f0f\uff1a<\/p>\n
<\/p>\n
\/\/ \u51fd\u6570\u5f0f\u98ce\u683c<\/span>\n_<\/span>.<\/span>each<\/span>(<\/span>[<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>]<\/span>,<\/span> function<\/span>(<\/span>item<\/span>)<\/span>{<\/span>\n    console<\/span>.<\/span>log<\/span>(<\/span>item<\/span>)<\/span>\n}<\/span>)<\/span>;<\/span>\n\n\/\/ \u9762\u5411\u5bf9\u8c61\u98ce\u683c<\/span>\n_<\/span>(<\/span>[<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>]<\/span>)<\/span>.<\/span>each<\/span>(<\/span>function<\/span>(<\/span>item<\/span>)<\/span>{<\/span>\n    console<\/span>.<\/span>log<\/span>(<\/span>item<\/span>)<\/span>\n}<\/span>)<\/span>;<\/span><\/pre>\n<\/div>\n
\u53ef\u662f\u8be5\u5982\u4f55\u5b9e\u73b0\u5462\uff1f<\/p>\n
\u65e2\u7136\u4ee5 _([1, 2, 3])<\/code> \u7684\u5f62\u5f0f\u53ef\u4ee5\u6267\u884c\uff0c\u5c31\u8868\u660e _<\/code> \u4e0d\u662f\u4e00\u4e2a\u5b57\u9762\u91cf\u5bf9\u8c61\uff0c\u800c\u662f\u4e00\u4e2a\u51fd\u6570\uff01<\/p>\n
\u5e78\u8fd0\u7684\u662f\uff0c\u5728 JavaScript \u4e2d\uff0c\u51fd\u6570\u4e5f\u662f\u4e00\u79cd\u5bf9\u8c61\uff0c\u6211\u4eec\u4e3e\u4e2a\u4f8b\u5b50\uff1a<\/p>\n
<\/p>\n
var<\/span> _<\/span> =<\/span> function<\/span>(<\/span>)<\/span> {<\/span>}<\/span>;<\/span>\n_<\/span>.<\/span>value<\/span> =<\/span> 1<\/span>;<\/span>\n_<\/span>.<\/span>log<\/span> =<\/span> function<\/span>(<\/span>)<\/span> {<\/span> return<\/span> this<\/span>.<\/span>value<\/span> +<\/span> 1<\/span> }<\/span>;<\/span>\n\nconsole<\/span>.<\/span>log<\/span>(<\/span>_<\/span>.<\/span>value<\/span>)<\/span>;<\/span> \/\/ 1<\/span>\nconsole<\/span>.<\/span>log<\/span>(<\/span>_<\/span>.<\/span>log<\/span>(<\/span>)<\/span>)<\/span>;<\/span> \/\/ 2<\/span><\/pre>\n<\/div>\n
\u6211\u4eec\u5b8c\u5168\u53ef\u4ee5\u5c06\u81ea\u5b9a\u4e49\u7684\u51fd\u6570\u5b9a\u4e49\u5728 _<\/code> \u51fd\u6570\u4e0a\uff01<\/p>\n
\u76ee\u524d\u7684\u5199\u6cd5\u4e3a\uff1a<\/p>\n
<\/p>\n
var<\/span> root<\/span> =<\/span> (<\/span>typeof<\/span> self<\/span> ==<\/span> 'object'<\/span> &&<\/span> self<\/span>.<\/span>self<\/span> ==<\/span> self<\/span> &&<\/span> self<\/span>)<\/span> ||<\/span>\n           (<\/span>typeof<\/span> global<\/span> ==<\/span> 'object'<\/span> &&<\/span> global<\/span>.<\/span>global<\/span> ==<\/span> global<\/span> &&<\/span> global<\/span>)<\/span> ||<\/span>\n           this<\/span> ||<\/span>\n           {<\/span>}<\/span>;<\/span>\n\nvar<\/span> _<\/span> =<\/span> function<\/span>(<\/span>)<\/span> {<\/span>}<\/span>\n\nroot<\/span>.<\/span>_<\/span> =<\/span> _<\/span>;<\/span><\/pre>\n<\/div>\n
\u5982\u4f55\u505a\u5230 _([1, 2, 3]).each(...)<\/code>\u5462\uff1f\u5373 _ \u51fd\u6570\u8fd4\u56de\u4e00\u4e2a\u5bf9\u8c61\uff0c\u8fd9\u4e2a\u5bf9\u8c61\uff0c\u5982\u4f55\u8c03\u7528\u6302\u5728 _ \u51fd\u6570\u4e0a\u7684\u65b9\u6cd5\u5462\uff1f<\/p>\n
\u6211\u4eec\u770b\u770b underscore \u662f\u5982\u4f55\u5b9e\u73b0\u7684\uff1a<\/p>\n
<\/p>\n
var<\/span> _<\/span> =<\/span> function<\/span>(<\/span>obj<\/span>)<\/span> {<\/span>\n    if<\/span> (<\/span>!<\/span>(<\/span>this<\/span> instanceof<\/span> _<\/span>)<\/span>)<\/span> return<\/span> new<\/span> _<\/span>(<\/span>obj<\/span>)<\/span>;<\/span>\n    this<\/span>.<\/span>_wrapped<\/span> =<\/span> obj<\/span>;<\/span>\n}<\/span>;<\/span>\n\n_<\/span>(<\/span>[<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>]<\/span>)<\/span>;<\/span><\/pre>\n<\/div>\n
\u6211\u4eec\u5206\u6790\u4e0b _([1, 2, 3])<\/code> \u7684\u6267\u884c\u8fc7\u7a0b\uff1a<\/p>\n
    \n
  1. \u6267\u884c this instanceof _<\/code>\uff0cthis \u6307\u5411 window \uff0cwindow instanceof _<\/code> \u4e3a false\uff0c!<\/code>\u64cd\u4f5c\u7b26\u53d6\u53cd\uff0c\u6240\u4ee5\u6267\u884c new _(obj)<\/code>\u3002<\/li>\n
  2. new _(obj)<\/code> \u4e2d\uff0cthis \u6307\u5411\u5b9e\u4f8b\u5bf9\u8c61\uff0cthis instanceof _<\/code> \u4e3a true\uff0c\u53d6\u53cd\u540e\uff0c\u4ee3\u7801\u63a5\u7740\u6267\u884c<\/li>\n
  3. \u6267\u884c this._wrapped = obj<\/code>\uff0c \u51fd\u6570\u6267\u884c\u7ed3\u675f<\/li>\n
  4. \u603b\u7ed3\uff0c_([1, 2, 3])<\/code> \u8fd4\u56de\u4e00\u4e2a\u5bf9\u8c61\uff0c\u4e3a {_wrapped: [1, 2, 3]}<\/code>\uff0c\u8be5\u5bf9\u8c61\u7684\u539f\u578b\u6307\u5411 _.prototype<\/li>\n<\/ol>\n
    \u793a\u610f\u56fe\u5982\u4e0b\uff1a<\/p>\n
    \"_()\u793a\u610f\u56fe\"<\/a><\/p>\n
    \u7136\u540e\u95ee\u9898\u6765\u4e86\uff0c\u6211\u4eec\u662f\u5c06\u65b9\u6cd5\u6302\u8f7d\u5230 _ \u51fd\u6570\u5bf9\u8c61\u4e0a\uff0c\u5e76\u6ca1\u6709\u6302\u5230\u51fd\u6570\u7684\u539f\u578b\u4e0a\u5450\uff0c\u6240\u4ee5\u8fd4\u56de\u4e86\u7684\u5b9e\u4f8b\uff0c\u5176\u5b9e\u662f\u65e0\u6cd5\u8c03\u7528 _ \u51fd\u6570\u5bf9\u8c61\u4e0a\u7684\u65b9\u6cd5\u7684\uff01<\/p>\n
    \u6211\u4eec\u5199\u4e2a\u4f8b\u5b50\uff1a<\/p>\n
    <\/p>\n
    (<\/span>function<\/span>(<\/span>)<\/span>{<\/span>\n    var<\/span> root<\/span> =<\/span> (<\/span>typeof<\/span> self<\/span> ==<\/span> 'object'<\/span> &&<\/span> self<\/span>.<\/span>self<\/span> ==<\/span> self<\/span> &&<\/span> self<\/span>)<\/span> ||<\/span>\n               (<\/span>typeof<\/span> global<\/span> ==<\/span> 'object'<\/span> &&<\/span> global<\/span>.<\/span>global<\/span> ==<\/span> global<\/span> &&<\/span> global<\/span>)<\/span> ||<\/span>\n               this<\/span> ||<\/span>\n               {<\/span>}<\/span>;<\/span>\n\n    var<\/span> _<\/span> =<\/span> function<\/span>(<\/span>obj<\/span>)<\/span> {<\/span>\n        if<\/span> (<\/span>!<\/span>(<\/span>this<\/span> instanceof<\/span> _<\/span>)<\/span>)<\/span> return<\/span> new<\/span> _<\/span>(<\/span>obj<\/span>)<\/span>;<\/span>\n        this<\/span>.<\/span>_wrapped<\/span> =<\/span> obj<\/span>;<\/span>\n    }<\/span>\n\n    root<\/span>.<\/span>_<\/span> =<\/span> _<\/span>;<\/span>\n\n    _<\/span>.<\/span>log<\/span> =<\/span> function<\/span>(<\/span>)<\/span>{<\/span>\n        console<\/span>.<\/span>log<\/span>(<\/span>1<\/span>)<\/span>\n    }<\/span>\n\n}<\/span>)<\/span>(<\/span>)<\/span>\n\n_<\/span>(<\/span>)<\/span>.<\/span>log<\/span>(<\/span>)<\/span>;<\/span> \/\/ _(...).log is not a function<\/span><\/pre>\n<\/div>\n
    \u786e\u5b9e\u6709\u8fd9\u4e2a\u95ee\u9898\uff0c\u6240\u4ee5\u6211\u4eec\u8fd8\u9700\u8981\u4e00\u4e2a\u65b9\u6cd5\u5c06 _ \u4e0a\u7684\u65b9\u6cd5\u590d\u5236\u5230 _.prototype<\/code> \u4e0a\uff0c\u8fd9\u4e2a\u65b9\u6cd5\u5c31\u662f _.mixin<\/code>\u3002<\/p>\n
    _.functions<\/h2>\n
    \u4e3a\u4e86\u5c06 _ \u4e0a\u7684\u65b9\u6cd5\u590d\u5236\u5230\u539f\u578b\u4e0a\uff0c\u9996\u5148\u6211\u4eec\u8981\u83b7\u5f97 _ \u4e0a\u7684\u65b9\u6cd5\uff0c\u6240\u4ee5\u6211\u4eec\u5148\u5199\u4e2a _.functions<\/code> \u65b9\u6cd5\u3002<\/p>\n
    <\/p>\n
    _<\/span>.<\/span>functions<\/span> =<\/span> function<\/span>(<\/span>obj<\/span>)<\/span> {<\/span>\n    var<\/span> names<\/span> =<\/span> [<\/span>]<\/span>;<\/span>\n    for<\/span> (<\/span>var<\/span> key<\/span> in<\/span> obj<\/span>)<\/span> {<\/span>\n        if<\/span> (<\/span>_<\/span>.<\/span>isFunction<\/span>(<\/span>obj<\/span>[<\/span>key<\/span>]<\/span>)<\/span>)<\/span> names<\/span>.<\/span>push<\/span>(<\/span>key<\/span>)<\/span>;<\/span>\n    }<\/span>\n    return<\/span> names<\/span>.<\/span>sort<\/span>(<\/span>)<\/span>;<\/span>\n}<\/span>;<\/span><\/pre>\n<\/div>\n
    isFunction \u51fd\u6570\u53ef\u4ee5\u53c2\u8003 \u300aJavaScript\u4e13\u9898\u4e4b\u7c7b\u578b\u5224\u65ad(\u4e0b)\u300b<\/a><\/p>\n
    mixin<\/h2>\n
    \u73b0\u5728\u6211\u4eec\u53ef\u4ee5\u5199 mixin \u65b9\u6cd5\u4e86\u3002<\/p>\n
    <\/p>\n
    var<\/span> ArrayProto<\/span> =<\/span> Array<\/span>.<\/span>prototype<\/span>;<\/span>\nvar<\/span> push<\/span> =<\/span> ArrayProto<\/span>.<\/span>push<\/span>;<\/span>\n\n_<\/span>.<\/span>mixin<\/span> =<\/span> function<\/span>(<\/span>obj<\/span>)<\/span> {<\/span>\n    _<\/span>.<\/span>each<\/span>(<\/span>_<\/span>.<\/span>functions<\/span>(<\/span>obj<\/span>)<\/span>,<\/span> function<\/span>(<\/span>name<\/span>)<\/span> {<\/span>\n        var<\/span> func<\/span> =<\/span> _<\/span>[<\/span>name<\/span>]<\/span> =<\/span> obj<\/span>[<\/span>name<\/span>]<\/span>;<\/span>\n        _<\/span>.<\/span>prototype<\/span>[<\/span>name<\/span>]<\/span> =<\/span> function<\/span>(<\/span>)<\/span> {<\/span>\n            var<\/span> args<\/span> =<\/span> [<\/span>this<\/span>.<\/span>_wrapped<\/span>]<\/span>;<\/span>\n            push<\/span>.<\/span>apply<\/span>(<\/span>args<\/span>,<\/span> arguments<\/span>)<\/span>;<\/span>\n            return<\/span> func<\/span>.<\/span>apply<\/span>(<\/span>_<\/span>,<\/span> args<\/span>)<\/span>;<\/span>\n        }<\/span>;<\/span>\n    }<\/span>)<\/span>;<\/span>\n    return<\/span> _<\/span>;<\/span>\n}<\/span>;<\/span>\n\n_<\/span>.<\/span>mixin<\/span>(<\/span>_<\/span>)<\/span>;<\/span><\/pre>\n<\/div>\n
    each \u65b9\u6cd5\u53ef\u4ee5\u53c2\u8003 \u300aJavaScript\u4e13\u9898jQuery\u901a\u7528\u904d\u5386\u65b9\u6cd5each\u7684\u5b9e\u73b0\u300b<\/a><\/p>\n
    \u503c\u5f97\u6ce8\u610f\u7684\u662f\uff1a\u56e0\u4e3a _[name] = obj[name]<\/code> \u7684\u7f18\u6545\uff0c\u6211\u4eec\u53ef\u4ee5\u7ed9 underscore \u62d3\u5c55\u81ea\u5b9a\u4e49\u7684\u65b9\u6cd5:<\/p>\n
    <\/p>\n
    _<\/span>.<\/span>mixin<\/span>(<\/span>{<\/span>\n  addOne<\/span>: function<\/span>(<\/span>num<\/span>)<\/span> {<\/span>\n    return<\/span> num<\/span> +<\/span> 1<\/span>;<\/span>\n  }<\/span>\n}<\/span>)<\/span>;<\/span>\n\n_<\/span>(<\/span>2<\/span>)<\/span>.<\/span>addOne<\/span>(<\/span>)<\/span>;<\/span> \/\/ 3<\/span><\/pre>\n<\/div>\n
    \u81f3\u6b64\uff0c\u6211\u4eec\u7b97\u662f\u5b9e\u73b0\u4e86\u540c\u65f6\u652f\u6301\u9762\u5411\u5bf9\u8c61\u98ce\u683c\u548c\u51fd\u6570\u98ce\u683c\u3002<\/p>\n
    \u5bfc\u51fa<\/h2>\n
    \u7ec8\u4e8e\u5230\u4e86\u8bb2\u6700\u540e\u4e00\u6b65 root._ = _<\/code>\uff0c\u6211\u4eec\u76f4\u63a5\u770b\u6e90\u7801\uff1a<\/p>\n
    <\/p>\n
    if<\/span> (<\/span>typeof<\/span> exports<\/span> !=<\/span> 'undefined'<\/span> &&<\/span> !<\/span>exports<\/span>.<\/span>nodeType<\/span>)<\/span> {<\/span>\n    if<\/span> (<\/span>typeof<\/span> module<\/span> !=<\/span> 'undefined'<\/span> &&<\/span> !<\/span>module<\/span>.<\/span>nodeType<\/span> &&<\/span> module<\/span>.<\/span>exports<\/span>)<\/span> {<\/span>\n        exports<\/span> =<\/span> module<\/span>.<\/span>exports<\/span> =<\/span> _<\/span>;<\/span>\n    }<\/span>\n    exports<\/span>.<\/span>_<\/span> =<\/span> _<\/span>;<\/span>\n}<\/span> else<\/span> {<\/span>\n    root<\/span>.<\/span>_<\/span> =<\/span> _<\/span>;<\/span>\n}<\/span><\/pre>\n<\/div>\n
    \u4e3a\u4e86\u652f\u6301\u6a21\u5757\u5316\uff0c\u6211\u4eec\u9700\u8981\u5c06 _ \u5728\u5408\u9002\u7684\u73af\u5883\u4e2d\u4f5c\u4e3a\u6a21\u5757\u5bfc\u51fa\uff0c\u4f46\u662f nodejs \u6a21\u5757\u7684 API \u66fe\u7ecf\u53d1\u751f\u8fc7\u6539\u53d8\uff0c\u6bd4\u5982\u5728\u65e9\u671f\u7248\u672c\u4e2d\uff1a<\/p>\n
    <\/p>\n
    \/\/ add.js<\/span>\nexports<\/span>.<\/span>addOne<\/span> =<\/span> function<\/span>(<\/span>num<\/span>)<\/span> {<\/span>\n  return<\/span> num<\/span> +<\/span> 1<\/span>\n}<\/span>\n\n\/\/ index.js<\/span>\nvar<\/span> add<\/span> =<\/span> require<\/span>(<\/span>'.\/add'<\/span>)<\/span>;<\/span>\nadd<\/span>.<\/span>addOne<\/span>(<\/span>2<\/span>)<\/span>;<\/span><\/pre>\n<\/div>\n
    \u5728\u65b0\u7248\u672c\u4e2d\uff1a<\/p>\n
    <\/p>\n
    \/\/ add.js<\/span>\nmodule<\/span>.<\/span>exports<\/span> =<\/span> function<\/span>(<\/span>1<\/span>)<\/span>{<\/span>\n    return<\/span> num<\/span> +<\/span> 1<\/span>\n}<\/span>\n\n\/\/ index.js<\/span>\nvar<\/span> addOne<\/span> =<\/span> require<\/span>(<\/span>'.\/add.js'<\/span>)<\/span>\naddOne<\/span>(<\/span>2<\/span>)<\/span><\/pre>\n<\/div>\n
    \u6240\u4ee5\u6211\u4eec\u6839\u636e exports \u548c module \u662f\u5426\u5b58\u5728\u6765\u9009\u62e9\u4e0d\u540c\u7684\u5bfc\u51fa\u65b9\u5f0f\uff0c\u90a3\u4e3a\u4ec0\u4e48\u5728\u65b0\u7248\u672c\u4e2d\uff0c\u6211\u4eec\u8fd8\u8981\u4f7f\u7528 exports = module.exports = _<\/code> \u5462\uff1f<\/p>\n
    \u8fd9\u662f\u56e0\u4e3a\u5728 nodejs \u4e2d\uff0cexports \u662f module.exports \u7684\u4e00\u4e2a\u5f15\u7528\uff0c\u5f53\u4f60\u4f7f\u7528\u4e86 module.exports = function(){}\uff0c\u5b9e\u9645\u4e0a\u8986\u76d6\u4e86 module.exports\uff0c\u4f46\u662f exports \u5e76\u672a\u53d1\u751f\u6539\u53d8\uff0c\u4e3a\u4e86\u907f\u514d\u540e\u9762\u518d\u4fee\u6539 exports \u800c\u5bfc\u81f4\u4e0d\u80fd\u6b63\u786e\u8f93\u51fa\uff0c\u5c31\u5199\u6210\u8fd9\u6837\uff0c\u5c06\u4e24\u8005\u4fdd\u6301\u7edf\u4e00\u3002<\/p>\n
    \u5199\u4e2a demo \u5427\uff1a<\/p>\n
    <\/p>\n
    \/\/ exports \u662f module.exports \u7684\u4e00\u4e2a\u5f15\u7528<\/span>\nmodule<\/span>.<\/span>exports<\/span>.<\/span>num<\/span> =<\/span> '1'<\/span>\n\nconsole<\/span>.<\/span>log<\/span>(<\/span>exports<\/span>.<\/span>num<\/span>)<\/span> \/\/ 1<\/span>\n\nexports<\/span>.<\/span>num<\/span> =<\/span> '2'<\/span>\n\nconsole<\/span>.<\/span>log<\/span>(<\/span>module<\/span>.<\/span>exports<\/span>.<\/span>num<\/span>)<\/span> \/\/ 2<\/span><\/pre>\n<\/div>\n
    <\/p>\n
    \/\/ addOne.js<\/span>\nmodule<\/span>.<\/span>exports<\/span> =<\/span> function<\/span>(<\/span>num<\/span>)<\/span>{<\/span>\n    return<\/span> num<\/span> +<\/span> 1<\/span>\n}<\/span>\n\nexports<\/span>.<\/span>num<\/span> =<\/span> '3'<\/span>\n\n\/\/ result.js \u4e2d\u5f15\u5165 addOne.js<\/span>\nvar<\/span> addOne<\/span> =<\/span> require<\/span>(<\/span>'.\/addOne.js'<\/span>)<\/span>;<\/span>\n\nconsole<\/span>.<\/span>log<\/span>(<\/span>addOne<\/span>(<\/span>1<\/span>)<\/span>)<\/span> \/\/ 2<\/span>\nconsole<\/span>.<\/span>log<\/span>(<\/span>addOne<\/span>.<\/span>num<\/span>)<\/span> \/\/ undefined<\/span><\/pre>\n<\/div>\n
    <\/p>\n
    \/\/ addOne.js<\/span>\nexports<\/span> =<\/span> module<\/span>.<\/span>exports<\/span> =<\/span> function<\/span>(<\/span>num<\/span>)<\/span>{<\/span>\n    return<\/span> num<\/span> +<\/span> 1<\/span>\n}<\/span>\n\nexports<\/span>.<\/span>num<\/span> =<\/span> '3'<\/span>\n\n\/\/ result.js \u4e2d\u5f15\u5165 addOne.js<\/span>\nvar<\/span> addOne<\/span> =<\/span> require<\/span>(<\/span>'.\/addOne.js'<\/span>)<\/span>;<\/span>\n\nconsole<\/span>.<\/span>log<\/span>(<\/span>addOne<\/span>(<\/span>1<\/span>)<\/span>)<\/span> \/\/ 2<\/span>\nconsole<\/span>.<\/span>log<\/span>(<\/span>addOne<\/span>.<\/span>num<\/span>)<\/span> \/\/ 3<\/span><\/pre>\n<\/div>\n
    \u6700\u540e\u4e3a\u4ec0\u4e48\u8981\u8fdb\u884c\u4e00\u4e2a exports.nodeType \u5224\u65ad\u5462\uff1f\u8fd9\u662f\u56e0\u4e3a\u5982\u679c\u4f60\u5728 HTML \u9875\u9762\u4e2d\u52a0\u5165\u4e00\u4e2a id \u4e3a exports \u7684\u5143\u7d20\uff0c\u6bd4\u5982<\/p>\n
    \n
    <<\/span>div<\/span> id<\/span>=\"exports<\/span>\"><\/span><\/<\/span>div<\/span>><\/span><\/pre>\n<\/div>\n
    \u5c31\u4f1a\u751f\u6210\u4e00\u4e2a window.exports \u5168\u5c40\u53d8\u91cf\uff0c\u4f60\u53ef\u4ee5\u76f4\u63a5\u5728\u6d4f\u89c8\u5668\u547d\u4ee4\u884c\u4e2d\u6253\u5370\u8be5\u53d8\u91cf\u3002<\/p>\n
    \u6b64\u65f6\u5728\u6d4f\u89c8\u5668\u4e2d\uff0ctypeof exports != 'undefined'<\/code> \u7684\u5224\u65ad\u5c31\u4f1a\u751f\u6548\uff0c\u7136\u540e exports._ = _<\/code>\uff0c\u7136\u800c\u5728\u6d4f\u89c8\u5668\u4e2d\uff0c\u6211\u4eec\u9700\u8981\u5c06 _ \u6302\u8f7d\u5230\u5168\u5c40\u53d8\u91cf\u4e0a\u5450\uff0c\u6240\u4ee5\u5728\u8fd9\u91cc\uff0c\u6211\u4eec\u8fd8\u9700\u8981\u8fdb\u884c\u4e00\u4e2a\u662f\u5426\u662f DOM \u8282\u70b9\u7684\u5224\u65ad\u3002<\/p>\n
    \u6e90\u7801<\/h2>\n
    \u6700\u7ec8\u7684\u4ee3\u7801\u5982\u4e0b\uff0c\u6709\u4e86\u8fd9\u4e2a\u57fa\u672c\u7ed3\u6784\uff0c\u4f60\u53ef\u4ee5\u81ea\u7531\u6dfb\u52a0\u4f60\u9700\u8981\u4f7f\u7528\u5230\u7684\u51fd\u6570\u4e86\uff1a<\/p>\n
    <\/p>\n
    (<\/span>function<\/span>(<\/span>)<\/span> {<\/span>\n\n    var<\/span> root<\/span> =<\/span> (<\/span>typeof<\/span> self<\/span> ==<\/span> 'object'<\/span> &&<\/span> self<\/span>.<\/span>self<\/span> ==<\/span> self<\/span> &&<\/span> self<\/span>)<\/span> ||<\/span>\n        (<\/span>typeof<\/span> global<\/span> ==<\/span> 'object'<\/span> &&<\/span> global<\/span>.<\/span>global<\/span> ==<\/span> global<\/span> &&<\/span> global<\/span>)<\/span> ||<\/span>\n        this<\/span> ||<\/span> {<\/span>}<\/span>;<\/span>\n\n    var<\/span> ArrayProto<\/span> =<\/span> Array<\/span>.<\/span>prototype<\/span>;<\/span>\n\n    var<\/span> push<\/span> =<\/span> ArrayProto<\/span>.<\/span>push<\/span>;<\/span>\n\n    var<\/span> _<\/span> =<\/span> function<\/span>(<\/span>obj<\/span>)<\/span> {<\/span>\n        if<\/span> (<\/span>obj<\/span> instanceof<\/span> _<\/span>)<\/span> return<\/span> obj<\/span>;<\/span>\n        if<\/span> (<\/span>!<\/span>(<\/span>this<\/span> instanceof<\/span> _<\/span>)<\/span>)<\/span> return<\/span> new<\/span> _<\/span>(<\/span>obj<\/span>)<\/span>;<\/span>\n        this<\/span>.<\/span>_wrapped<\/span> =<\/span> obj<\/span>;<\/span>\n    }<\/span>;<\/span>\n\n    if<\/span> (<\/span>typeof<\/span> exports<\/span> !=<\/span> 'undefined'<\/span> &&<\/span> !<\/span>exports<\/span>.<\/span>nodeType<\/span>)<\/span> {<\/span>\n        if<\/span> (<\/span>typeof<\/span> module<\/span> !=<\/span> 'undefined'<\/span> &&<\/span> !<\/span>module<\/span>.<\/span>nodeType<\/span> &&<\/span> module<\/span>.<\/span>exports<\/span>)<\/span> {<\/span>\n            exports<\/span> =<\/span> module<\/span>.<\/span>exports<\/span> =<\/span> _<\/span>;<\/span>\n        }<\/span>\n        exports<\/span>.<\/span>_<\/span> =<\/span> _<\/span>;<\/span>\n    }<\/span> else<\/span> {<\/span>\n        root<\/span>.<\/span>_<\/span> =<\/span> _<\/span>;<\/span>\n    }<\/span>\n\n    _<\/span>.<\/span>VERSION<\/span> =<\/span> '0.1'<\/span>;<\/span>\n\n    var<\/span> MAX_ARRAY_INDEX<\/span> =<\/span> Math<\/span>.<\/span>pow<\/span>(<\/span>2<\/span>,<\/span> 53<\/span>)<\/span> -<\/span> 1<\/span>;<\/span>\n\n    var<\/span> isArrayLike<\/span> =<\/span> function<\/span>(<\/span>collection<\/span>)<\/span> {<\/span>\n        var<\/span> length<\/span> =<\/span> collection<\/span>.<\/span>length<\/span>;<\/span>\n        return<\/span> typeof<\/span> length<\/span> ==<\/span> 'number'<\/span> &&<\/span> length<\/span> >=<\/span> 0<\/span> &&<\/span> length<\/span> <=<\/span> MAX_ARRAY_INDEX<\/span>;<\/span>\n    }<\/span>;<\/span>\n\n    _<\/span>.<\/span>each<\/span> =<\/span> function<\/span>(<\/span>obj<\/span>,<\/span> callback<\/span>)<\/span> {<\/span>\n        var<\/span> length<\/span>,<\/span> i<\/span> =<\/span> 0<\/span>;<\/span>\n\n        if<\/span> (<\/span>isArrayLike<\/span>(<\/span>obj<\/span>)<\/span>)<\/span> {<\/span>\n            length<\/span> =<\/span> obj<\/span>.<\/span>length<\/span>;<\/span>\n            for<\/span> (<\/span>;<\/span> i<\/span> <<\/span> length<\/span>;<\/span> i<\/span>++<\/span>)<\/span> {<\/span>\n                if<\/span> (<\/span>callback<\/span>.<\/span>call<\/span>(<\/span>obj<\/span>[<\/span>i<\/span>]<\/span>,<\/span> obj<\/span>[<\/span>i<\/span>]<\/span>,<\/span> i<\/span>)<\/span> ===<\/span> false<\/span>)<\/span> {<\/span>\n                    break<\/span>;<\/span>\n                }<\/span>\n            }<\/span>\n        }<\/span> else<\/span> {<\/span>\n            for<\/span> (<\/span>i<\/span> in<\/span> obj<\/span>)<\/span> {<\/span>\n                if<\/span> (<\/span>callback<\/span>.<\/span>call<\/span>(<\/span>obj<\/span>[<\/span>i<\/span>]<\/span>,<\/span> obj<\/span>[<\/span>i<\/span>]<\/span>,<\/span> i<\/span>)<\/span> ===<\/span> false<\/span>)<\/span> {<\/span>\n                    break<\/span>;<\/span>\n                }<\/span>\n            }<\/span>\n        }<\/span>\n\n        return<\/span> obj<\/span>;<\/span>\n    }<\/span>\n\n    _<\/span>.<\/span>isFunction<\/span> =<\/span> function<\/span>(<\/span>obj<\/span>)<\/span> {<\/span>\n        return<\/span> typeof<\/span> obj<\/span> ==<\/span> 'function'<\/span> ||<\/span> false<\/span>;<\/span>\n    }<\/span>;<\/span>\n\n    _<\/span>.<\/span>functions<\/span> =<\/span> function<\/span>(<\/span>obj<\/span>)<\/span> {<\/span>\n        var<\/span> names<\/span> =<\/span> [<\/span>]<\/span>;<\/span>\n        for<\/span> (<\/span>var<\/span> key<\/span> in<\/span> obj<\/span>)<\/span> {<\/span>\n            if<\/span> (<\/span>_<\/span>.<\/span>isFunction<\/span>(<\/span>obj<\/span>[<\/span>key<\/span>]<\/span>)<\/span>)<\/span> names<\/span>.<\/span>push<\/span>(<\/span>key<\/span>)<\/span>;<\/span>\n        }<\/span>\n        return<\/span> names<\/span>.<\/span>sort<\/span>(<\/span>)<\/span>;<\/span>\n    }<\/span>;<\/span>\n\n    \/**<\/span>\n     * \u5728 _.mixin(_) \u524d\u6dfb\u52a0\u81ea\u5df1\u5b9a\u4e49\u7684\u65b9\u6cd5<\/span>\n     *\/<\/span>\n    _<\/span>.<\/span>reverse<\/span> =<\/span> function<\/span>(<\/span>string<\/span>)<\/span>{<\/span>\n        return<\/span> string<\/span>.<\/span>split<\/span>(<\/span>''<\/span>)<\/span>.<\/span>reverse<\/span>(<\/span>)<\/span>.<\/span>join<\/span>(<\/span>''<\/span>)<\/span>;<\/span>\n    }<\/span>\n\n    _<\/span>.<\/span>mixin<\/span> =<\/span> function<\/span>(<\/span>obj<\/span>)<\/span> {<\/span>\n        _<\/span>.<\/span>each<\/span>(<\/span>_<\/span>.<\/span>functions<\/span>(<\/span>obj<\/span>)<\/span>,<\/span> function<\/span>(<\/span>name<\/span>)<\/span> {<\/span>\n            var<\/span> func<\/span> =<\/span> _<\/span>[<\/span>name<\/span>]<\/span> =<\/span> obj<\/span>[<\/span>name<\/span>]<\/span>;<\/span>\n            _<\/span>.<\/span>prototype<\/span>[<\/span>name<\/span>]<\/span> =<\/span> function<\/span>(<\/span>)<\/span> {<\/span>\n                var<\/span> args<\/span> =<\/span> [<\/span>this<\/span>.<\/span>_wrapped<\/span>]<\/span>;<\/span>\n\n                push<\/span>.<\/span>apply<\/span>(<\/span>args<\/span>,<\/span> arguments<\/span>)<\/span>;<\/span>\n\n                return<\/span> func<\/span>.<\/span>apply<\/span>(<\/span>_<\/span>,<\/span> args<\/span>)<\/span>;<\/span>\n            }<\/span>;<\/span>\n        }<\/span>)<\/span>;<\/span>\n        return<\/span> _<\/span>;<\/span>\n    }<\/span>;<\/span>\n\n    _<\/span>.<\/span>mixin<\/span>(<\/span>_<\/span>)<\/span>;<\/span>\n\n}<\/span>)<\/span>(<\/span>)<\/span><\/pre>\n<\/div>\n
    \u76f8\u5173\u94fe\u63a5<\/h2>\n
      \n
    1. \n
      \u300aJavaScript\u4e13\u9898\u4e4b\u7c7b\u578b\u5224\u65ad(\u4e0b)\u300b<\/a><\/p>\n<\/li>\n
    2. \n
      \u300aJavaScript\u4e13\u9898jQuery\u901a\u7528\u904d\u5386\u65b9\u6cd5each\u7684\u5b9e\u73b0\u300b<\/a><\/p>\n<\/li>\n<\/ol>\n
      underscore \u7cfb\u5217<\/h2>\n
      underscore \u7cfb\u5217\u76ee\u5f55\u5730\u5740\uff1ahttps:\/\/github.com\/mqyqingfeng\/Blog<\/a>\u3002<\/p>\n
      underscore \u7cfb\u5217\u9884\u8ba1\u5199\u516b\u7bc7\u5de6\u53f3\uff0c\u91cd\u70b9\u4ecb\u7ecd underscore \u4e2d\u7684\u4ee3\u7801\u67b6\u6784\u3001\u94fe\u5f0f\u8c03\u7528\u3001\u5185\u90e8\u51fd\u6570\u3001\u6a21\u677f\u5f15\u64ce\u7b49\u5185\u5bb9\uff0c\u65e8\u5728\u5e2e\u52a9\u5927\u5bb6\u9605\u8bfb\u6e90\u7801\uff0c\u4ee5\u53ca\u5199\u51fa\u81ea\u5df1\u7684 undercore\u3002<\/p>\n
      \u5982\u679c\u6709\u9519\u8bef\u6216\u8005\u4e0d\u4e25\u8c28\u7684\u5730\u65b9\uff0c\u8bf7\u52a1\u5fc5\u7ed9\u4e88\u6307\u6b63\uff0c\u5341\u5206\u611f\u8c22\u3002\u5982\u679c\u559c\u6b22\u6216\u8005\u6709\u6240\u542f\u53d1\uff0c\u6b22\u8fcestar\uff0c\u5bf9\u4f5c\u8005\u4e5f\u662f\u4e00\u79cd\u9f13\u52b1\u3002<\/p>\n<\/td>\n
      \u6587\u7ae0\u8f6c\u8f7d\u81eahttps:\/\/github.com\/mqyqingfeng\/Blog\/issues\/56<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
      \u524d\u8a00 \u5728 \u300aJavaScript \u4e13\u9898\u7cfb\u5217\u300b \u4e2d\uff0c\u6211\u4eec\u5199\u4e86\u5f88\u591a\u7684\u529f\u80fd\u51fd\u6570\uff0c\u6bd4\u5982\u9632\u6296\u3001\u8282\u6d41\u3001\u53bb\u91cd\u3001\u7c7b\u578b\u5224\u65ad\u3001\u6241\u5e73\u6570\u7ec4\u3001\u6df1\u6d45\u62f7\u8d1d\u3001\u67e5\u627e\u6570\u7ec4\u5143\u7d20\u3001\u901a\u7528\u904d\u5386\u3001\u67ef\u91cc\u5316\u3001\u51fd…<\/p>\n
       Read More  Read More<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1371","post","type-post","status-publish","format-standard","hentry","category-learn"],"_links":{"self":[{"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/posts\/1371"}],"collection":[{"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.lccc.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1371"}],"version-history":[{"count":1,"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/posts\/1371\/revisions"}],"predecessor-version":[{"id":1470,"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/posts\/1371\/revisions\/1470"}],"wp:attachment":[{"href":"https:\/\/www.lccc.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1371"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.lccc.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1371"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.lccc.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1371"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}