{"id":1377,"date":"2024-06-02T22:28:51","date_gmt":"2024-06-02T22:28:51","guid":{"rendered":""},"modified":"2024-06-05T03:09:46","modified_gmt":"2024-06-04T19:09:46","slug":"javascript%e4%b8%93%e9%a2%98%e4%b9%8b%e4%bb%8e%e9%9b%b6%e5%ae%9e%e7%8e%b0jquery%e7%9a%84extend","status":"publish","type":"post","link":"https:\/\/www.lccc.top\/?p=1377","title":{"rendered":"JavaScript\u4e13\u9898\u4e4b\u4ece\u96f6\u5b9e\u73b0jQuery\u7684extend"},"content":{"rendered":"\n

\u524d\u8a00<\/h2>\n

jQuery \u7684 extend \u662f jQuery \u4e2d\u5e94\u7528\u975e\u5e38\u591a\u7684\u4e00\u4e2a\u51fd\u6570\uff0c\u4eca\u5929\u6211\u4eec\u4e00\u8fb9\u770b jQuery \u7684 extend \u7684\u7279\u6027\uff0c\u4e00\u8fb9\u5b9e\u73b0\u4e00\u4e2a extend!<\/p>\n

extend \u57fa\u672c\u7528\u6cd5<\/h2>\n

\u5148\u6765\u770b\u770b extend \u7684\u529f\u80fd\uff0c\u5f15\u7528 jQuery \u5b98\u7f51\uff1a<\/p>\n

\n

Merge the contents of two or more objects together into the first object.<\/p>\n<\/blockquote>\n

\u7ffb\u8bd1\u8fc7\u6765\u5c31\u662f\uff0c\u5408\u5e76\u4e24\u4e2a\u6216\u8005\u66f4\u591a\u7684\u5bf9\u8c61\u7684\u5185\u5bb9\u5230\u7b2c\u4e00\u4e2a\u5bf9\u8c61\u4e2d\u3002<\/p>\n

\u8ba9\u6211\u4eec\u770b\u770b extend \u7684\u7528\u6cd5\uff1a<\/p>\n

\n
jQuery<\/span>.<\/span>extend<\/span>(<\/span> target<\/span> [<\/span>,<\/span> object1<\/span> ]<\/span> [<\/span>,<\/span> objectN<\/span> ]<\/span> )<\/span><\/pre>\n<\/div>\n
\u7b2c\u4e00\u4e2a\u53c2\u6570 target\uff0c\u8868\u793a\u8981\u62d3\u5c55\u7684\u76ee\u6807\uff0c\u6211\u4eec\u5c31\u79f0\u5b83\u4e3a\u76ee\u6807\u5bf9\u8c61\u5427\u3002<\/p>\n
\u540e\u9762\u7684\u53c2\u6570\uff0c\u90fd\u4f20\u5165\u5bf9\u8c61\uff0c\u5185\u5bb9\u90fd\u4f1a\u590d\u5236\u5230\u76ee\u6807\u5bf9\u8c61\u4e2d\uff0c\u6211\u4eec\u5c31\u79f0\u5b83\u4eec\u4e3a\u5f85\u590d\u5236\u5bf9\u8c61\u5427\u3002<\/p>\n
\u4e3e\u4e2a\u4f8b\u5b50\uff1a<\/p>\n
<\/p>\n
var<\/span> obj1<\/span> =<\/span> {<\/span>\n    a<\/span>: 1<\/span>,<\/span>\n    b<\/span>: {<\/span> b1<\/span>: 1<\/span>,<\/span> b2<\/span>: 2<\/span> }<\/span>\n}<\/span>;<\/span>\n\nvar<\/span> obj2<\/span> =<\/span> {<\/span>\n    b<\/span>: {<\/span> b1<\/span>: 3<\/span>,<\/span> b3<\/span>: 4<\/span> }<\/span>,<\/span>\n    c<\/span>: 3<\/span>\n}<\/span>;<\/span>\n\nvar<\/span> obj3<\/span> =<\/span> {<\/span>\n    d<\/span>: 4<\/span>\n}<\/span>\n\nconsole<\/span>.<\/span>log<\/span>(<\/span>$<\/span>.<\/span>extend<\/span>(<\/span>obj1<\/span>,<\/span> obj2<\/span>,<\/span> obj3<\/span>)<\/span>)<\/span>;<\/span>\n\n\/\/ {<\/span>\n\/\/    a: 1,<\/span>\n\/\/    b: { b1: 3, b3: 4 },<\/span>\n\/\/    c: 3,<\/span>\n\/\/    d: 4<\/span>\n\/\/ }<\/span><\/pre>\n<\/div>\n
\u5f53\u4e24\u4e2a\u5bf9\u8c61\u51fa\u73b0\u76f8\u540c\u5b57\u6bb5\u7684\u65f6\u5019\uff0c\u540e\u8005\u4f1a\u8986\u76d6\u524d\u8005\uff0c\u800c\u4e0d\u4f1a\u8fdb\u884c\u6df1\u5c42\u6b21\u7684\u8986\u76d6\u3002<\/p>\n
extend \u7b2c\u4e00\u7248<\/h2>\n
\u7ed3\u5408\u7740\u4e0a\u7bc7\u5199\u5f97 \u300aJavaScript\u4e13\u9898\u4e4b\u6df1\u6d45\u62f7\u8d1d\u300b<\/a>\uff0c\u6211\u4eec\u5c1d\u8bd5\u7740\u81ea\u5df1\u5199\u4e00\u4e2a extend \u51fd\u6570\uff1a<\/p>\n
<\/p>\n
\/\/ \u7b2c\u4e00\u7248<\/span>\nfunction<\/span> extend<\/span>(<\/span>)<\/span> {<\/span>\n    var<\/span> name<\/span>,<\/span> options<\/span>,<\/span> copy<\/span>;<\/span>\n    var<\/span> length<\/span> =<\/span> arguments<\/span>.<\/span>length<\/span>;<\/span>\n    var<\/span> i<\/span> =<\/span> 1<\/span>;<\/span>\n    var<\/span> target<\/span> =<\/span> arguments<\/span>[<\/span>0<\/span>]<\/span>;<\/span>\n\n    for<\/span> (<\/span>;<\/span> i<\/span> <<\/span> length<\/span>;<\/span> i<\/span>++<\/span>)<\/span> {<\/span>\n        options<\/span> =<\/span> arguments<\/span>[<\/span>i<\/span>]<\/span>;<\/span>\n        if<\/span> (<\/span>options<\/span> !=<\/span> null<\/span>)<\/span> {<\/span>\n            for<\/span> (<\/span>name<\/span> in<\/span> options<\/span>)<\/span> {<\/span>\n                copy<\/span> =<\/span> options<\/span>[<\/span>name<\/span>]<\/span>;<\/span>\n                if<\/span> (<\/span>copy<\/span> !==<\/span> undefined<\/span>)<\/span>{<\/span>\n                    target<\/span>[<\/span>name<\/span>]<\/span> =<\/span> copy<\/span>;<\/span>\n                }<\/span>\n            }<\/span>\n        }<\/span>\n    }<\/span>\n\n    return<\/span> target<\/span>;<\/span>\n}<\/span>;<\/span><\/pre>\n<\/div>\n
extend \u6df1\u62f7\u8d1d<\/h2>\n
\u90a3\u5982\u4f55\u8fdb\u884c\u6df1\u5c42\u6b21\u7684\u590d\u5236\u5462\uff1fjQuery v1.1.4 \u52a0\u5165\u4e86\u4e00\u4e2a\u65b0\u7684\u7528\u6cd5\uff1a<\/p>\n
\n
jQuery<\/span>.<\/span>extend<\/span>(<\/span> [<\/span>deep<\/span>]<\/span>,<\/span> target<\/span>,<\/span> object1<\/span> [<\/span>,<\/span> objectN<\/span> ]<\/span> )<\/span><\/pre>\n<\/div>\n
\u4e5f\u5c31\u662f\u8bf4\uff0c\u51fd\u6570\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\u53ef\u4ee5\u4f20\u4e00\u4e2a\u5e03\u5c14\u503c\uff0c\u5982\u679c\u4e3a true\uff0c\u6211\u4eec\u5c31\u4f1a\u8fdb\u884c\u6df1\u62f7\u8d1d\uff0cfalse \u4f9d\u7136\u5f53\u505a\u6d45\u62f7\u8d1d\uff0c\u8fd9\u4e2a\u65f6\u5019\uff0ctarget \u5c31\u5f80\u540e\u79fb\u52a8\u5230\u7b2c\u4e8c\u4e2a\u53c2\u6570\u3002<\/p>\n
\u8fd8\u662f\u4e3e\u8fd9\u4e2a\u4f8b\u5b50\uff1a<\/p>\n
<\/p>\n
var<\/span> obj1<\/span> =<\/span> {<\/span>\n    a<\/span>: 1<\/span>,<\/span>\n    b<\/span>: {<\/span> b1<\/span>: 1<\/span>,<\/span> b2<\/span>: 2<\/span> }<\/span>\n}<\/span>;<\/span>\n\nvar<\/span> obj2<\/span> =<\/span> {<\/span>\n    b<\/span>: {<\/span> b1<\/span>: 3<\/span>,<\/span> b3<\/span>: 4<\/span> }<\/span>,<\/span>\n    c<\/span>: 3<\/span>\n}<\/span>;<\/span>\n\nvar<\/span> obj3<\/span> =<\/span> {<\/span>\n    d<\/span>: 4<\/span>\n}<\/span>\n\nconsole<\/span>.<\/span>log<\/span>(<\/span>$<\/span>.<\/span>extend<\/span>(<\/span>true<\/span>,<\/span> obj1<\/span>,<\/span> obj2<\/span>,<\/span> obj3<\/span>)<\/span>)<\/span>;<\/span>\n\n\/\/ {<\/span>\n\/\/    a: 1,<\/span>\n\/\/    b: { b1: 3, b2: 2, b3: 4 },<\/span>\n\/\/    c: 3,<\/span>\n\/\/    d: 4<\/span>\n\/\/ }<\/span><\/pre>\n<\/div>\n
\u56e0\u4e3a\u91c7\u7528\u4e86\u6df1\u62f7\u8d1d\uff0c\u4f1a\u904d\u5386\u5230\u66f4\u6df1\u7684\u5c42\u6b21\u8fdb\u884c\u6dfb\u52a0\u548c\u8986\u76d6\u3002<\/p>\n
extend \u7b2c\u4e8c\u7248<\/h2>\n
\u6211\u4eec\u6765\u5b9e\u73b0\u6df1\u62f7\u8d1d\u7684\u529f\u80fd\uff0c\u503c\u5f97\u6ce8\u610f\u7684\u662f\uff1a<\/p>\n
    \n
  1. \u9700\u8981\u6839\u636e\u7b2c\u4e00\u4e2a\u53c2\u6570\u7684\u7c7b\u578b\uff0c\u786e\u5b9a target \u548c\u8981\u5408\u5e76\u7684\u5bf9\u8c61\u7684\u4e0b\u6807\u8d77\u59cb\u503c\u3002<\/li>\n
  2. \u5982\u679c\u662f\u6df1\u62f7\u8d1d\uff0c\u6839\u636e copy \u7684\u7c7b\u578b\u9012\u5f52 extend\u3002<\/li>\n<\/ol>\n
    <\/p>\n
    \/\/ \u7b2c\u4e8c\u7248<\/span>\nfunction<\/span> extend<\/span>(<\/span>)<\/span> {<\/span>\n    \/\/ \u9ed8\u8ba4\u4e0d\u8fdb\u884c\u6df1\u62f7\u8d1d<\/span>\n    var<\/span> deep<\/span> =<\/span> false<\/span>;<\/span>\n    var<\/span> name<\/span>,<\/span> options<\/span>,<\/span> src<\/span>,<\/span> copy<\/span>;<\/span>\n    var<\/span> length<\/span> =<\/span> arguments<\/span>.<\/span>length<\/span>;<\/span>\n    \/\/ \u8bb0\u5f55\u8981\u590d\u5236\u7684\u5bf9\u8c61\u7684\u4e0b\u6807<\/span>\n    var<\/span> i<\/span> =<\/span> 1<\/span>;<\/span>\n    \/\/ \u7b2c\u4e00\u4e2a\u53c2\u6570\u4e0d\u4f20\u5e03\u5c14\u503c\u7684\u60c5\u51b5\u4e0b\uff0ctarget\u9ed8\u8ba4\u662f\u7b2c\u4e00\u4e2a\u53c2\u6570<\/span>\n    var<\/span> target<\/span> =<\/span> arguments<\/span>[<\/span>0<\/span>]<\/span> ||<\/span> {<\/span>}<\/span>;<\/span>\n    \/\/ \u5982\u679c\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u5e03\u5c14\u503c\uff0c\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u624d\u662ftarget<\/span>\n    if<\/span> (<\/span>typeof<\/span> target<\/span> ==<\/span> 'boolean'<\/span>)<\/span> {<\/span>\n        deep<\/span> =<\/span> target<\/span>;<\/span>\n        target<\/span> =<\/span> arguments<\/span>[<\/span>i<\/span>]<\/span> ||<\/span> {<\/span>}<\/span>;<\/span>\n        i<\/span>++<\/span>;<\/span>\n    }<\/span>\n    \/\/ \u5982\u679ctarget\u4e0d\u662f\u5bf9\u8c61\uff0c\u6211\u4eec\u662f\u65e0\u6cd5\u8fdb\u884c\u590d\u5236\u7684\uff0c\u6240\u4ee5\u8bbe\u4e3a{}<\/span>\n    if<\/span> (<\/span>typeof<\/span> target<\/span> !==<\/span> 'object'<\/span>)<\/span> {<\/span>\n        target<\/span> =<\/span> {<\/span>}<\/span>\n    }<\/span>\n\n    \/\/ \u5faa\u73af\u904d\u5386\u8981\u590d\u5236\u7684\u5bf9\u8c61\u4eec<\/span>\n    for<\/span> (<\/span>;<\/span> i<\/span> <<\/span> length<\/span>;<\/span> i<\/span>++<\/span>)<\/span> {<\/span>\n        \/\/ \u83b7\u53d6\u5f53\u524d\u5bf9\u8c61<\/span>\n        options<\/span> =<\/span> arguments<\/span>[<\/span>i<\/span>]<\/span>;<\/span>\n        \/\/ \u8981\u6c42\u4e0d\u80fd\u4e3a\u7a7a \u907f\u514dextend(a,,b)\u8fd9\u79cd\u60c5\u51b5<\/span>\n        if<\/span> (<\/span>options<\/span> !=<\/span> null<\/span>)<\/span> {<\/span>\n            for<\/span> (<\/span>name<\/span> in<\/span> options<\/span>)<\/span> {<\/span>\n                \/\/ \u76ee\u6807\u5c5e\u6027\u503c<\/span>\n                src<\/span> =<\/span> target<\/span>[<\/span>name<\/span>]<\/span>;<\/span>\n                \/\/ \u8981\u590d\u5236\u7684\u5bf9\u8c61\u7684\u5c5e\u6027\u503c<\/span>\n                copy<\/span> =<\/span> options<\/span>[<\/span>name<\/span>]<\/span>;<\/span>\n\n                if<\/span> (<\/span>deep<\/span> &&<\/span> copy<\/span> &&<\/span> typeof<\/span> copy<\/span> ==<\/span> 'object'<\/span>)<\/span> {<\/span>\n                    \/\/ \u9012\u5f52\u8c03\u7528<\/span>\n                    target<\/span>[<\/span>name<\/span>]<\/span> =<\/span> extend<\/span>(<\/span>deep<\/span>,<\/span> src<\/span>,<\/span> copy<\/span>)<\/span>;<\/span>\n                }<\/span>\n                else<\/span> if<\/span> (<\/span>copy<\/span> !==<\/span> undefined<\/span>)<\/span>{<\/span>\n                    target<\/span>[<\/span>name<\/span>]<\/span> =<\/span> copy<\/span>;<\/span>\n                }<\/span>\n            }<\/span>\n        }<\/span>\n    }<\/span>\n\n    return<\/span> target<\/span>;<\/span>\n}<\/span>;<\/span><\/pre>\n<\/div>\n
    \u5728\u5b9e\u73b0\u4e0a\uff0c\u6838\u5fc3\u7684\u90e8\u5206\u8fd8\u662f\u8ddf\u4e0a\u7bc7\u5b9e\u73b0\u7684\u6df1\u6d45\u62f7\u8d1d\u51fd\u6570\u4e00\u81f4\uff0c\u5982\u679c\u8981\u590d\u5236\u7684\u5bf9\u8c61\u7684\u5c5e\u6027\u503c\u662f\u4e00\u4e2a\u5bf9\u8c61\uff0c\u5c31\u9012\u5f52\u8c03\u7528 extend\u3002\u4e0d\u8fc7 extend \u7684\u5b9e\u73b0\u4e2d\uff0c\u591a\u4e86\u5f88\u591a\u7ec6\u8282\u4e0a\u7684\u5224\u65ad\uff0c\u6bd4\u5982\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u5426\u662f\u5e03\u5c14\u503c\uff0ctarget \u662f\u5426\u662f\u4e00\u4e2a\u5bf9\u8c61\uff0c\u4e0d\u4f20\u53c2\u6570\u65f6\u7684\u9ed8\u8ba4\u503c\u7b49\u3002<\/p>\n
    \u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u770b\u51e0\u4e2a jQuery \u7684 extend \u4f7f\u7528\u6548\u679c\uff1a<\/p>\n
    target \u662f\u51fd\u6570<\/h2>\n
    \u5728\u6211\u4eec\u7684\u5b9e\u73b0\u4e2d\uff0ctypeof target<\/code> \u5fc5\u987b\u7b49\u4e8e object<\/code>\uff0c\u6211\u4eec\u624d\u4f1a\u5728\u8fd9\u4e2a target<\/code> \u57fa\u7840\u4e0a\u8fdb\u884c\u62d3\u5c55\uff0c\u7136\u800c\u6211\u4eec\u7528 typeof<\/code> \u5224\u65ad\u4e00\u4e2a\u51fd\u6570\u65f6\uff0c\u4f1a\u8fd4\u56defunction<\/code>\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u6211\u4eec\u65e0\u6cd5\u5728\u4e00\u4e2a\u51fd\u6570\u4e0a\u8fdb\u884c\u62d3\u5c55\uff01<\/p>\n
    \u4ec0\u4e48\uff0c\u6211\u4eec\u8fd8\u80fd\u5728\u4e00\u4e2a\u51fd\u6570\u4e0a\u8fdb\u884c\u62d3\u5c55\uff01\uff01<\/p>\n
    \u5f53\u7136\u5566\uff0c\u6bd5\u7adf\u51fd\u6570\u4e5f\u662f\u4e00\u79cd\u5bf9\u8c61\u561b\uff0c\u8ba9\u6211\u4eec\u770b\u4e2a\u4f8b\u5b50\uff1a<\/p>\n
    <\/p>\n
    function<\/span> a<\/span>(<\/span>)<\/span> {<\/span>}<\/span>\n\na<\/span>.<\/span>target<\/span> =<\/span> 'b'<\/span>;<\/span>\n\nconsole<\/span>.<\/span>log<\/span>(<\/span>a<\/span>.<\/span>target<\/span>)<\/span>;<\/span> \/\/ b<\/span><\/pre>\n<\/div>\n
    \u5b9e\u9645\u4e0a\uff0c\u5728 underscore \u7684\u5b9e\u73b0\u4e2d\uff0cunderscore \u7684\u5404\u79cd\u65b9\u6cd5\u4fbf\u662f\u6302\u5728\u4e86\u51fd\u6570\u4e0a\uff01<\/p>\n
    \u6240\u4ee5\u5728\u8fd9\u91cc\u6211\u4eec\u8fd8\u8981\u5224\u65ad\u662f\u4e0d\u662f\u51fd\u6570\uff0c\u8fd9\u65f6\u5019\u6211\u4eec\u4fbf\u53ef\u4ee5\u4f7f\u7528\u300aJavaScript\u4e13\u9898\u4e4b\u7c7b\u578b\u5224\u65ad(\u4e0a)\u300b<\/a>\u4e2d\u5199\u5f97 isFunction \u51fd\u6570<\/p>\n
    \u6211\u4eec\u8fd9\u6837\u4fee\u6539\uff1a<\/p>\n
    <\/p>\n
    if<\/span> (<\/span>typeof<\/span> target<\/span> !==<\/span> \"object\"<\/span> &&<\/span> !<\/span>isFunction<\/span>(<\/span>target<\/span>)<\/span>)<\/span> {<\/span>\n    target<\/span> =<\/span> {<\/span>}<\/span>;<\/span>\n}<\/span><\/pre>\n<\/div>\n
    \u7c7b\u578b\u4e0d\u4e00\u81f4<\/h2>\n
    \u5176\u5b9e\u6211\u4eec\u5b9e\u73b0\u7684\u65b9\u6cd5\u6709\u4e2a\u5c0f bug \uff0c\u4e0d\u4fe1\u6211\u4eec\u5199\u4e2a demo:<\/p>\n
    <\/p>\n
    var<\/span> obj1<\/span> =<\/span> {<\/span>\n    a<\/span>: 1<\/span>,<\/span>\n    b<\/span>: {<\/span>\n        c<\/span>: 2<\/span>\n    }<\/span>\n}<\/span>\n\nvar<\/span> obj2<\/span> =<\/span> {<\/span>\n    b<\/span>: {<\/span>\n        c<\/span>: [<\/span>5<\/span>]<\/span>,<\/span>\n\n    }<\/span>\n}<\/span>\n\nvar<\/span> d<\/span> =<\/span> extend<\/span>(<\/span>true<\/span>,<\/span> obj1<\/span>,<\/span> obj2<\/span>)<\/span>\nconsole<\/span>.<\/span>log<\/span>(<\/span>d<\/span>)<\/span>;<\/span><\/pre>\n<\/div>\n
    \u6211\u4eec\u9884\u671f\u4f1a\u8fd4\u56de\u8fd9\u6837\u4e00\u4e2a\u5bf9\u8c61\uff1a<\/p>\n
    <\/p>\n
    {<\/span>\n    a<\/span>: 1<\/span>,<\/span>\n    b<\/span>: {<\/span>\n        c<\/span>: [<\/span>5<\/span>]<\/span>\n    }<\/span>\n}<\/span><\/pre>\n<\/div>\n
    \u7136\u800c\u8fd4\u56de\u4e86\u8fd9\u6837\u4e00\u4e2a\u5bf9\u8c61:<\/p>\n
    <\/p>\n
    {<\/span>\n    a<\/span>: 1<\/span>,<\/span>\n    b<\/span>: {<\/span>\n        c<\/span>: {<\/span>\n            0<\/span>: 5<\/span>\n        }<\/span>\n    }<\/span>\n}<\/span><\/pre>\n<\/div>\n
    \u8ba9\u6211\u4eec\u7ec6\u7ec6\u5206\u6790\u4e3a\u4ec0\u4e48\u4f1a\u5bfc\u81f4\u8fd9\u79cd\u60c5\u51b5\uff1a<\/p>\n
    \u9996\u5148\u6211\u4eec\u5728\u51fd\u6570\u7684\u5f00\u59cb\u5199\u4e00\u4e2a console \u51fd\u6570\u6bd4\u5982\uff1aconsole.log(1)\uff0c\u7136\u540e\u4ee5\u4e0a\u9762\u8fd9\u4e2a demo \u4e3a\u4f8b\uff0c\u6267\u884c\u4e00\u4e0b\uff0c\u6211\u4eec\u4f1a\u53d1\u73b0 1 \u6253\u5370\u4e86\u4e09\u6b21\uff0c\u8fd9\u5c31\u662f\u8bf4 extend \u51fd\u6570\u6267\u884c\u4e86\u4e09\u904d\uff0c\u8ba9\u6211\u4eec\u634b\u4e00\u634b\u8fd9\u4e09\u904d\u4f20\u5165\u7684\u53c2\u6570\uff1a<\/p>\n
    \u7b2c\u4e00\u904d\u6267\u884c\u5230\u9012\u5f52\u8c03\u7528\u65f6\uff1a<\/p>\n
    <\/p>\n
    var<\/span> src<\/span> =<\/span> {<\/span> c<\/span>: 2<\/span> }<\/span>;<\/span>\nvar<\/span> copy<\/span> =<\/span> {<\/span> c<\/span>: [<\/span>5<\/span>]<\/span>}<\/span>;<\/span>\n\ntarget<\/span>[<\/span>name<\/span>]<\/span> =<\/span> extend<\/span>(<\/span>true<\/span>,<\/span> src<\/span>,<\/span> copy<\/span>)<\/span>;<\/span><\/pre>\n<\/div>\n
    \u7b2c\u4e8c\u904d\u6267\u884c\u5230\u9012\u5f52\u8c03\u7528\u65f6\uff1a<\/p>\n
    <\/p>\n
    var<\/span> src<\/span> =<\/span> 2<\/span>;<\/span>\nvar<\/span> copy<\/span> =<\/span> [<\/span>5<\/span>]<\/span>;<\/span>\n\ntarget<\/span>[<\/span>name<\/span>]<\/span> =<\/span> extend<\/span>(<\/span>true<\/span>,<\/span> src<\/span>,<\/span> copy<\/span>)<\/span>;<\/span><\/pre>\n<\/div>\n
    \u7b2c\u4e09\u904d\u8fdb\u884c\u6700\u7ec8\u7684\u8d4b\u503c\uff0c\u56e0\u4e3a src \u662f\u4e00\u4e2a\u57fa\u672c\u7c7b\u578b\uff0c\u6211\u4eec\u9ed8\u8ba4\u4f7f\u7528\u4e00\u4e2a\u7a7a\u5bf9\u8c61\u4f5c\u4e3a\u76ee\u6807\u503c\uff0c\u6240\u4ee5\u6700\u7ec8\u7684\u7ed3\u679c\u5c31\u53d8\u6210\u4e86\u5bf9\u8c61\u7684\u5c5e\u6027\uff01<\/p>\n
    \u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u6211\u4eec\u9700\u8981\u5bf9\u76ee\u6807\u5c5e\u6027\u503c\u548c\u5f85\u590d\u5236\u5bf9\u8c61\u7684\u5c5e\u6027\u503c\u8fdb\u884c\u5224\u65ad\uff1a<\/p>\n
    \u5224\u65ad\u76ee\u6807\u5c5e\u6027\u503c\u8ddf\u8981\u590d\u5236\u7684\u5bf9\u8c61\u7684\u5c5e\u6027\u503c\u7c7b\u578b\u662f\u5426\u4e00\u81f4:<\/p>\n