{"id":1352,"date":"2024-06-02T22:21:17","date_gmt":"2024-06-02T22:21:17","guid":{"rendered":""},"modified":"2024-06-05T03:08:19","modified_gmt":"2024-06-04T19:08:19","slug":"react-%e4%b9%8b-createelement-%e6%ba%90%e7%a0%81%e8%a7%a3%e8%af%bb","status":"publish","type":"post","link":"https:\/\/www.lccc.top\/?p=1352","title":{"rendered":"React \u4e4b createElement \u6e90\u7801\u89e3\u8bfb"},"content":{"rendered":"\n

React \u4e0e Babel<\/h2>\n

\u5143\u7d20\u6807\u7b7e\u8f6c\u8bd1<\/h3>\n

\u7528\u8fc7 React \u7684\u540c\u5b66\u90fd\u77e5\u9053\uff0c\u5f53\u6211\u4eec\u8fd9\u6837\u5199\u65f6\uff1a<\/p>\n

\n
<<\/span>div<\/span> id<\/span>=<\/span>\"foo\"<\/span>><\/span>bar<<\/span>\/<\/span>div<\/span>><\/span><\/pre>\n<\/div>\n
Babel \u4f1a\u5c06\u5176\u8f6c\u8bd1\u4e3a\uff1a<\/p>\n
\n
React<\/span>.<\/span>createElement<\/span>(<\/span>\"div\"<\/span>,<\/span> {<\/span>id<\/span>: \"foo\"<\/span>}<\/span>,<\/span> \"bar\"<\/span>)<\/span>;<\/span><\/pre>\n<\/div>\n
\u6211\u4eec\u4f1a\u53d1\u73b0\uff0ccreateElement<\/code> \u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u5143\u7d20\u7c7b\u578b\uff0c\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u5143\u7d20\u5c5e\u6027\uff0c\u7b2c\u4e09\u4e2a\u53c2\u6570\u662f\u5b50\u5143\u7d20<\/p>\n
\u7ec4\u4ef6\u8f6c\u8bd1<\/h3>\n
\u5982\u679c\u6211\u4eec\u7528\u7684\u662f\u4e00\u4e2a\u7ec4\u4ef6\u5462\uff1f<\/p>\n
<\/p>\n
function<\/span> Foo<\/span>(<\/span>{<\/span>id}<\/span>)<\/span> {<\/span>\n  return<\/span> <<\/span>div<\/span> id<\/span>=<\/span>{<\/span>id<\/span>}<\/span>><\/span>foo<<\/span>\/<\/span>div<\/span>><\/span>\n}<\/span>\n\n<<\/span>Foo<\/span> id<\/span>=<\/span>\"foo\"<\/span>><\/span>\n  <<\/span>div<\/span> id<\/span>=<\/span>\"bar\"<\/span>><\/span>bar<<\/span>\/<\/span>div<\/span>><\/span>\n<<\/span>\/<\/span>Foo<\/span>><\/span><\/pre>\n<\/div>\n
Babel \u5219\u4f1a\u5c06\u5176\u8f6c\u8bd1\u4e3a\uff1a<\/p>\n
<\/p>\n
function<\/span> Foo<\/span>(<\/span>{<\/span>id}<\/span>)<\/span> {<\/span>\n  return<\/span> React<\/span>.<\/span>createElement<\/span>(<\/span>\"div\"<\/span>,<\/span> {<\/span>id<\/span>: id<\/span>}<\/span>,<\/span> \"foo\"<\/span>)<\/span>}<\/span>\n\nReact<\/span>.<\/span>createElement<\/span>(<\/span>Foo<\/span>,<\/span> {<\/span>id<\/span>: \"foo\"<\/span>}<\/span>,<\/span>\n  React<\/span>.<\/span>createElement<\/span>(<\/span>\"div\"<\/span>,<\/span> {<\/span>id<\/span>: \"bar\"<\/span>}<\/span>,<\/span> \"bar\"<\/span>)<\/span>\n)<\/span>;<\/span><\/pre>\n<\/div>\n
\u6211\u4eec\u4f1a\u53d1\u73b0\uff0ccreateElement<\/code> \u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\u4f20\u5165\u7684\u662f\u53d8\u91cf Foo<\/code><\/p>\n
\u5b50\u5143\u7d20\u8f6c\u8bd1<\/h3>\n
\u5982\u679c\u6211\u4eec\u6709\u591a\u4e2a\u5b50\u5143\u7d20\u5462\uff1f<\/p>\n
<\/p>\n
<<\/span>div<\/span> id<\/span>=<\/span>\"foo\"<\/span>><\/span>\n  <<\/span>div<\/span> id<\/span>=<\/span>\"bar\"<\/span>><\/span>bar<<\/span>\/<\/span>div<\/span>><\/span>\n\t<<\/span>div<\/span> id<\/span>=<\/span>\"baz\"<\/span>><\/span>baz<<\/span>\/<\/span>div<\/span>><\/span>\n  <<\/span>div<\/span> id<\/span>=<\/span>\"qux\"<\/span>><\/span>qux<<\/span>\/<\/span>div<\/span>><\/span>\n<<\/span>\/<\/span>div<\/span>><\/span><\/pre>\n<\/div>\n
Babel \u5219\u4f1a\u5c06\u5176\u8f6c\u8bd1\u4e3a\uff1a<\/p>\n
<\/p>\n
React<\/span>.<\/span>createElement<\/span>(<\/span>\"div\"<\/span>,<\/span> {<\/span> id<\/span>: \"foo\"<\/span>}<\/span>,<\/span> \n  React<\/span>.<\/span>createElement<\/span>(<\/span>\"div\"<\/span>,<\/span> {<\/span>id<\/span>: \"bar\"<\/span>}<\/span>,<\/span> \"bar\"<\/span>)<\/span>,<\/span> \n  React<\/span>.<\/span>createElement<\/span>(<\/span>\"div\"<\/span>,<\/span> {<\/span>id<\/span>: \"baz\"<\/span>}<\/span>,<\/span> \"baz\"<\/span>)<\/span>,<\/span>\n  React<\/span>.<\/span>createElement<\/span>(<\/span>\"div\"<\/span>,<\/span> {<\/span>id<\/span>: \"qux\"<\/span>}<\/span>,<\/span> \"qux\"<\/span>)<\/span>\n)<\/span>;<\/span><\/pre>\n<\/div>\n
\u6211\u4eec\u4f1a\u53d1\u73b0\uff0c\u5b50\u5143\u7d20\u5176\u5b9e\u662f\u4f5c\u4e3a\u53c2\u6570\u4e0d\u65ad\u8ffd\u52a0\u4f20\u5165\u5230\u51fd\u6570\u4e2d<\/p>\n
createElement<\/h2>\n
\u90a3 React.createElement \u5230\u5e95\u505a\u4e86\u4ec0\u4e48\u5462\uff1f<\/p>\n
\u6e90\u7801<\/h3>\n
\u6211\u4eec\u67e5\u770b React \u7684 GitHub \u4ed3\u5e93\uff1ahttps:\/\/github.com\/facebook\/react<\/a>\uff0c\u67e5\u770b pacakges\/react\/index.js<\/code>\u6587\u4ef6\uff0c\u53ef\u4ee5\u770b\u5230 createElement<\/code> \u7684\u5b9a\u4e49\u5728 .\/src\/React<\/code>\u6587\u4ef6\uff1a<\/p>\n
<\/p>\n
\/\/ \u7b80\u5316\u540e<\/span>\nexport<\/span> {<\/span>createElement<\/span>}<\/span> from<\/span> '.\/src\/React'<\/span>;<\/span><\/pre>\n<\/div>\n
\u6211\u4eec\u6253\u5f00  .\/src\/React.js<\/code>\u6587\u4ef6\uff1a<\/p>\n
<\/p>\n
import<\/span> {<\/span>\n  createElement<\/span> as<\/span> createElementProd<\/span>\n}<\/span> from<\/span> '.\/ReactElement'<\/span>;<\/span>\n\nconst<\/span> createElement<\/span> =<\/span> __DEV__<\/span>\n  ? createElementWithValidation<\/span>\n  : createElementProd<\/span>;<\/span>\n\nexport<\/span> {<\/span> createElement<\/span> }<\/span>;<\/span><\/pre>\n<\/div>\n
\u7ee7\u7eed\u67e5\u770b .\/ReactElement.js<\/code>\u6587\u4ef6\uff0c\u5728\u8fd9\u91cc\u7ec8\u4e8e\u627e\u5230\u6700\u7ec8\u7684\u5b9a\u4e49\uff0c\u9274\u4e8e\u8fd9\u91cc\u4ee3\u7801\u8f83\u957f\uff0c\u6211\u4eec\u5c06\u4ee3\u7801\u6781\u5ea6\u7b80\u5316\u4e00\u4e0b\uff1a<\/p>\n
<\/p>\n
const<\/span> RESERVED_PROPS<\/span> =<\/span> {<\/span>\n  key<\/span>: true<\/span>,<\/span>\n  ref<\/span>: true<\/span>,<\/span>\n  __self<\/span>: true<\/span>,<\/span>\n  __source<\/span>: true<\/span>,<\/span>\n}<\/span>;<\/span>\n\nexport<\/span> function<\/span> createElement<\/span>(<\/span>type<\/span>,<\/span> config<\/span>,<\/span> ...children<\/span>)<\/span> {<\/span>\n  let<\/span> propName<\/span>;<\/span>\n\n  \/\/ Reserved names are extracted<\/span>\n  const<\/span> props<\/span> =<\/span> {<\/span>}<\/span>;<\/span>\n\n  \/\/ \u7b2c\u4e00\u6bb5<\/span>\n  let<\/span> key<\/span> =<\/span> ''<\/span> +<\/span> config<\/span>.<\/span>key<\/span>;<\/span>\n  let<\/span> ref<\/span> =<\/span> config<\/span>.<\/span>ref<\/span>;<\/span>\n  let<\/span> self<\/span> =<\/span> config<\/span>.<\/span>__self<\/span>;<\/span>\n  let<\/span> source<\/span> =<\/span> config<\/span>.<\/span>__source<\/span>;<\/span>\n\n  \/\/ \u7b2c\u4e8c\u6bb5<\/span>\n  for<\/span> (<\/span>propName<\/span> in<\/span> config<\/span>)<\/span> {<\/span>\n    if<\/span> (<\/span>config<\/span>.<\/span>hasOwnProperty<\/span>(<\/span>propName<\/span>)<\/span> &&<\/span> !<\/span>RESERVED_PROPS<\/span>.<\/span>hasOwnProperty<\/span>(<\/span>propName<\/span>)<\/span>)<\/span> {<\/span>\n      props<\/span>[<\/span>propName<\/span>]<\/span> =<\/span> config<\/span>[<\/span>propName<\/span>]<\/span>;<\/span>\n    }<\/span>\n  }<\/span>\n\n  \/\/ \u7b2c\u4e09\u6bb5<\/span>\n  props<\/span>.<\/span>children<\/span> =<\/span> children<\/span>;<\/span>\n\n  \/\/ \u7b2c\u56db\u6bb5<\/span>\n  if<\/span> (<\/span>type<\/span> &&<\/span> type<\/span>.<\/span>defaultProps<\/span>)<\/span> {<\/span>\n    const<\/span> defaultProps<\/span> =<\/span> type<\/span>.<\/span>defaultProps<\/span>;<\/span>\n    for<\/span> (<\/span>propName<\/span> in<\/span> defaultProps<\/span>)<\/span> {<\/span>\n      if<\/span> (<\/span>props<\/span>[<\/span>propName<\/span>]<\/span> ===<\/span> undefined<\/span>)<\/span> {<\/span>\n        props<\/span>[<\/span>propName<\/span>]<\/span> =<\/span> defaultProps<\/span>[<\/span>propName<\/span>]<\/span>;<\/span>\n      }<\/span>\n    }<\/span>\n  }<\/span>\n\n  \/\/ \u7b2c\u4e94\u6bb5<\/span>\n  return<\/span> ReactElement<\/span>(<\/span>\n    type<\/span>,<\/span>\n    key<\/span>,<\/span>\n    ref<\/span>,<\/span>\n    self<\/span>,<\/span>\n    source<\/span>,<\/span>\n    ReactCurrentOwner<\/span>.<\/span>current<\/span>,<\/span>\n    props<\/span>,<\/span>\n  )<\/span>;<\/span>\n}<\/span><\/pre>\n<\/div>\n
\u8fd9\u91cc\u53ef\u4ee5\u770b\u51fa\uff0ccreateElement<\/code> \u51fd\u6570\u4e3b\u8981\u662f\u505a\u4e86\u4e00\u4e2a\u9884\u5904\u7406\uff0c\u7136\u540e\u5c06\u5904\u7406\u597d\u7684\u6570\u636e\u4f20\u5165 ReactElement<\/code> \u51fd\u6570\u4e2d\uff0c\u6211\u4eec\u5148\u5206\u6790\u4e0b createElement \u505a\u4e86\u4ec0\u4e48\u3002<\/p>\n
\u51fd\u6570\u5165\u53c2<\/h3>\n
\u6211\u4eec\u4ee5\u6700\u4e00\u5f00\u59cb\u7684\u4f8b\u5b50\u4e3a\u4f8b\uff1a<\/p>\n
<\/p>\n
<<\/span>div<\/span> id<\/span>=<\/span>\"foo\"<\/span>><\/span>bar<<\/span>\/<\/span>div<\/span>><\/span>\n\/\/ \u8f6c\u8bd1\u4e3a<\/span>\nReact<\/span>.<\/span>createElement<\/span>(<\/span>\"div\"<\/span>,<\/span> {<\/span>id<\/span>: \"foo\"<\/span>}<\/span>,<\/span> \"bar\"<\/span>)<\/span>;<\/span><\/pre>\n<\/div>\n
\u5bf9\u4e8ecreateElement<\/code> \u7684\u4e09\u4e2a\u5f62\u53c2\uff0c\u5176\u4e2dtype<\/code> \u8868\u793a\u7c7b\u578b\uff0c\u65e2\u53ef\u4ee5\u662f\u6807\u7b7e\u540d\u5b57\u7b26\u4e32\uff08\u5982 div \u6216 span\uff09\uff0c\u4e5f\u53ef\u4ee5\u662f React \u7ec4\u4ef6\uff08\u5982 Foo\uff09<\/p>\n
config<\/code> \u8868\u793a\u4f20\u5165\u7684\u5c5e\u6027\uff0cchildren<\/code> \u8868\u793a\u5b50\u5143\u7d20<\/p>\n
\u7b2c\u4e00\u6bb5\u4ee3\u7801 __self \u548c __source<\/h3>\n
\u73b0\u5728\u6211\u4eec\u5f00\u59cb\u770b\u7b2c\u4e00\u6bb5\u4ee3\u7801\uff1a<\/p>\n
<\/p>\n
  \/\/ \u7b2c\u4e00\u6bb5<\/span>\n  let<\/span> key<\/span> =<\/span> ''<\/span> +<\/span> config<\/span>.<\/span>key<\/span>;<\/span>\n  let<\/span> ref<\/span> =<\/span> config<\/span>.<\/span>ref<\/span>;<\/span>\n  let<\/span> self<\/span> =<\/span> config<\/span>.<\/span>__self<\/span>;<\/span>\n  let<\/span> source<\/span> =<\/span> config<\/span>.<\/span>__source<\/span>;<\/span><\/pre>\n<\/div>\n
\u53ef\u4ee5\u770b\u5230\u5728 createElement<\/code> \u51fd\u6570\u5185\u90e8\uff0ckey<\/code>\u3001ref<\/code>\u3001__self<\/code>\u3001__source<\/code> \u8fd9\u56db\u4e2a\u53c2\u6570\u662f\u5355\u72ec\u83b7\u53d6\u5e76\u5904\u7406\u7684\uff0ckey<\/code> \u548c ref<\/code> \u5f88\u597d\u7406\u89e3\uff0c__self<\/code> \u548c __source<\/code> \u662f\u505a\u4ec0\u4e48\u7528\u7684\u5462\uff1f<\/p>\n
\u901a\u8fc7\u8fd9\u4e2a issue<\/a>\uff0c\u6211\u4eec\u4e86\u89e3\u5230\uff0c__self<\/code> \u548c __source<\/code> \u662f babel-preset-react<\/code>\u6ce8\u5165\u7684\u8c03\u8bd5\u4fe1\u606f\uff0c\u53ef\u4ee5\u63d0\u4f9b\u66f4\u6709\u7528\u7684\u9519\u8bef\u4fe1\u606f\u3002<\/p>\n
\u6211\u4eec\u67e5\u770b babel-preset-react \u7684\u6587\u6863<\/a>\uff0c\u53ef\u4ee5\u770b\u5230\uff1a<\/p>\n
\n
development<\/strong><\/p>\n
boolean \u7c7b\u578b\uff0c\u9ed8\u8ba4\u503c\u4e3a false.
\n\u8fd9\u53ef\u4ee5\u7528\u4e8e\u5f00\u542f\u7279\u5b9a\u4e8e\u5f00\u53d1\u73af\u5883\u7684\u67d0\u4e9b\u884c\u4e3a\uff0c\u4f8b\u5982\u6dfb\u52a0 __source \u548c __self\u3002
\n\u5728\u4e0e env \u53c2\u6570 \u914d\u7f6e\u6216 js \u914d\u7f6e\u6587\u4ef6 \u914d\u5408\u4f7f\u7528\u65f6\uff0c\u6b64\u529f\u80fd\u5f88\u6709\u7528\u3002<\/p>\n<\/blockquote>\n
\u5982\u679c\u6211\u4eec\u8bd5\u7740\u5f00\u542f development<\/code> \u53c2\u6570\uff0c\u5c31\u4f1a\u770b\u5230 __self<\/code> \u548c __source<\/code> \u53c2\u6570\uff0c\u4f9d\u7136\u4ee5 <div id=\"foo\">bar<\/div><\/code> \u4e3a\u4f8b\uff0c\u4f1a\u88ab Babel \u8f6c\u8bd1\u6210\uff1a<\/p>\n
<\/p>\n
var<\/span> _jsxFileName<\/span> =<\/span> \"\/Users\/kevin\/Desktop\/react-app\/src\/index.js\"<\/span>;<\/span>\nReact<\/span>.<\/span>createElement<\/span>(<\/span>\"div\"<\/span>,<\/span> {<\/span>\n  id<\/span>: \"foo\"<\/span>,<\/span>\n  __self<\/span>: this<\/span>,<\/span>\n  __source<\/span>: {<\/span>\n    fileName<\/span>: _jsxFileName<\/span>,<\/span>\n    lineNumber<\/span>: 5<\/span>,<\/span>\n    columnNumber<\/span>: 13<\/span>\n  }<\/span>\n}<\/span>,<\/span> \"bar\"<\/span>)<\/span>;<\/span><\/pre>\n<\/div>\n
\u7b2c\u4e8c\u6bb5\u4ee3\u7801 props \u5bf9\u8c61<\/h3>\n
\u73b0\u5728\u6211\u4eec\u770b\u7b2c\u4e8c\u6bb5\u4ee3\u7801\uff1a<\/p>\n
<\/p>\n
\/\/ \u7b2c\u4e8c\u6bb5<\/span>\nfor<\/span> (<\/span>propName<\/span> in<\/span> config<\/span>)<\/span> {<\/span>\n    if<\/span> (<\/span>config<\/span>.<\/span>hasOwnProperty<\/span>(<\/span>propName<\/span>)<\/span> &&<\/span> !<\/span>RESERVED_PROPS<\/span>.<\/span>hasOwnProperty<\/span>(<\/span>propName<\/span>)<\/span>)<\/span> {<\/span>\n      props<\/span>[<\/span>propName<\/span>]<\/span> =<\/span> config<\/span>[<\/span>propName<\/span>]<\/span>;<\/span>\n    }<\/span>\n}<\/span><\/pre>\n<\/div>\n
\u8fd9\u6bb5\u4ee3\u7801\u5b9e\u73b0\u7684\u529f\u80fd\u5f88\u7b80\u5355\uff0c\u5c31\u662f\u6784\u5efa\u4e00\u4e2a props \u5bf9\u8c61\uff0c\u53bb\u9664\u4f20\u5165\u7684 key<\/code>\u3001ref<\/code>\u3001__self<\/code>\u3001__source<\/code>\u5c5e\u6027\uff0c\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48\u5728\u7ec4\u4ef6\u4e2d\uff0c\u6211\u4eec\u660e\u660e\u4f20\u5165\u4e86 key<\/code> \u548cref<\/code>\uff0c\u4f46\u6211\u4eec\u65e0\u6cd5\u901a\u8fc7 this.props.key<\/code> \u6216\u8005 this.props.ref<\/code> \u6765\u83b7\u53d6\u4f20\u5165\u7684\u503c\uff0c\u5c31\u662f\u56e0\u4e3a\u5728\u8fd9\u91cc\u88ab\u53bb\u9664\u6389\u4e86\u3002<\/p>\n
\u800c\u4e4b\u6240\u4ee5\u53bb\u9664\uff0cReact \u7ed9\u51fa\u7684\u89e3\u91ca\u662f\uff0ckey<\/code> \u548c ref<\/code> \u662f\u7528\u4e8e React \u5185\u90e8\u5904\u7406\u7684\uff0c\u5982\u679c\u4f60\u60f3\u7528\u6bd4\u5982 key \u503c\uff0c\u4f60\u53ef\u4ee5\u518d\u4f20\u4e00\u4e2a\u5176\u4ed6\u5c5e\u6027\uff0c\u7528\u8ddf key \u76f8\u540c\u7684\u503c\u5373\u53ef\u3002<\/p>\n
\u7b2c\u4e09\u6bb5\u4ee3\u7801 children<\/h3>\n
\u73b0\u5728\u6211\u4eec\u770b\u7b2c\u4e09\u6bb5\u4ee3\u7801\uff0c\u8fd9\u6bb5\u4ee3\u7801\u88ab\u7cbe\u7b80\u7684\u5f88\u7b80\u5355\uff1a<\/p>\n
<\/p>\n
\/\/ \u7b2c\u4e09\u6bb5<\/span>\nprops<\/span>.<\/span>children<\/span> =<\/span> children<\/span>;<\/span><\/pre>\n<\/div>\n
\u8fd9\u662f\u5176\u5b9e\u662f\u56e0\u4e3a\u6211\u4eec\u4e3a\u4e86\u7b80\u5316\u4ee3\u7801\uff0c\u7528\u4e86 ES6 \u7684\u6269\u5c55\u8fd0\u7b97\u6cd5\uff0c\u5b9e\u9645\u7684\u6e90\u7801\u91cc\u4f1a\u590d\u6742\u4e14\u6709\u4e00\u4e9b\u5dee\u522b\uff1a<\/p>\n
<\/p>\n
const<\/span> childrenLength<\/span> =<\/span> arguments<\/span>.<\/span>length<\/span> -<\/span> 2<\/span>;<\/span>\n  if<\/span> (<\/span>childrenLength<\/span> ===<\/span> 1<\/span>)<\/span> {<\/span>\n    props<\/span>.<\/span>children<\/span> =<\/span> children<\/span>;<\/span>\n  }<\/span> else<\/span> if<\/span> (<\/span>childrenLength<\/span> ><\/span> 1<\/span>)<\/span> {<\/span>\n    const<\/span> childArray<\/span> =<\/span> Array<\/span>(<\/span>childrenLength<\/span>)<\/span>;<\/span>\n    for<\/span> (<\/span>let<\/span> i<\/span> =<\/span> 0<\/span>;<\/span> i<\/span> <<\/span> childrenLength<\/span>;<\/span> i<\/span>++<\/span>)<\/span> {<\/span>\n      childArray<\/span>[<\/span>i<\/span>]<\/span> =<\/span> arguments<\/span>[<\/span>i<\/span> +<\/span> 2<\/span>]<\/span>;<\/span>\n    }<\/span>\n    props<\/span>.<\/span>children<\/span> =<\/span> childArray<\/span>;<\/span>\n}<\/span><\/pre>\n<\/div>\n
\u6211\u4eec\u4e5f\u53ef\u4ee5\u53d1\u73b0\uff0c\u5f53\u53ea\u6709\u4e00\u4e2a\u5b50\u5143\u7d20\u7684\u65f6\u5019\uff0cchildren<\/code> \u5176\u5b9e\u4f1a\u76f4\u63a5\u8d4b\u503c\u7ed9 props.children<\/code>\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u5f53\u53ea\u6709\u4e00\u4e2a\u5b50\u5143\u7d20\u65f6\uff0cchildren \u662f\u4e00\u4e2a\u5bf9\u8c61\uff08React \u5143\u7d20\uff09\uff0c\u5f53\u6709\u591a\u4e2a\u5b50\u5143\u7d20\u65f6\uff0cchildren \u662f\u4e00\u4e2a\u5305\u542b\u5bf9\u8c61\uff08React \u5143\u7d20\uff09\u7684\u6570\u7ec4\u3002<\/p>\n
\u7b2c\u56db\u6bb5\u4ee3\u7801 defaultProps<\/h3>\n
\u73b0\u5728\u6211\u4eec\u770b\u7b2c\u56db\u6bb5\u4ee3\u7801\uff1a<\/p>\n
<\/p>\n
  \/\/ \u7b2c\u56db\u6bb5<\/span>\n  if<\/span> (<\/span>type<\/span> &&<\/span> type<\/span>.<\/span>defaultProps<\/span>)<\/span> {<\/span>\n    const<\/span> defaultProps<\/span> =<\/span> type<\/span>.<\/span>defaultProps<\/span>;<\/span>\n    for<\/span> (<\/span>propName<\/span> in<\/span> defaultProps<\/span>)<\/span> {<\/span>\n      if<\/span> (<\/span>props<\/span>[<\/span>propName<\/span>]<\/span> ===<\/span> undefined<\/span>)<\/span> {<\/span>\n        props<\/span>[<\/span>propName<\/span>]<\/span> =<\/span> defaultProps<\/span>[<\/span>propName<\/span>]<\/span>;<\/span>\n      }<\/span>\n    }<\/span>\n  }<\/span><\/pre>\n<\/div>\n
\u8fd9\u6bb5\u5176\u5b9e\u662f\u5904\u7406\u7ec4\u4ef6\u7684defaultProps<\/code>\uff0c\u65e0\u8bba\u662f\u51fd\u6570\u7ec4\u4ef6\u8fd8\u662f\u7c7b\u7ec4\u4ef6\u90fd\u652f\u6301 defaultProps<\/code>\uff0c\u4e3e\u4e2a\u4f7f\u7528\u4f8b\u5b50\uff1a<\/p>\n
<\/p>\n
\/\/ \u51fd\u6570\u7ec4\u4ef6<\/span>\nfunction<\/span> Foo<\/span>(<\/span>{<\/span>id}<\/span>)<\/span> {<\/span>\n  return<\/span> <<\/span>div<\/span> id<\/span>=<\/span>{<\/span>id<\/span>}<\/span>><\/span>foo<<\/span>\/<\/span>div<\/span>><\/span>\n}<\/span>\n \n Foo<\/span>.<\/span>defaultProps<\/span> =<\/span> {<\/span>\n   id<\/span>: 'foo'<\/span>\n }<\/span>\n\n\/\/ \u7c7b\u7ec4\u4ef6<\/span>\n class<\/span> Header<\/span> extends<\/span> Component<\/span> {<\/span>\n   static<\/span> defaultProps<\/span> =<\/span> {<\/span>\n     id<\/span>: 'foo'<\/span>\n   }<\/span>\n   render<\/span> (<\/span>)<\/span> {<\/span>\n     const<\/span> {<\/span> id }<\/span> =<\/span> this<\/span>.<\/span>props<\/span>\n     return<\/span> <<\/span>div<\/span> id<\/span>=<\/span>{<\/span>id<\/span>}<\/span>><\/span>foo<<\/span>\/<\/span>div<\/span>><\/span>\n   }<\/span>\n }<\/span><\/pre>\n<\/div>\n
\u7b2c\u4e94\u6bb5\u4ee3\u7801 owner<\/h3>\n
\u73b0\u5728\u6211\u4eec\u770b\u7b2c\u4e94\u6bb5\u4ee3\u7801\uff1a<\/p>\n
<\/p>\n
  \/\/ \u7b2c\u4e94\u6bb5<\/span>\n  return<\/span> ReactElement<\/span>(<\/span>\n    type<\/span>,<\/span>\n    key<\/span>,<\/span>\n    ref<\/span>,<\/span>\n    self<\/span>,<\/span>\n    source<\/span>,<\/span>\n    ReactCurrentOwner<\/span>.<\/span>current<\/span>,<\/span>\n    props<\/span>,<\/span>\n  )<\/span>;<\/span><\/pre>\n<\/div>\n
\u8fd9\u6bb5\u5c31\u662f\u628a\u524d\u9762\u5904\u7406\u597d\u7684 type<\/code>\u3001key<\/code> \u7b49\u503c\u4f20\u5165 ReactElement<\/code> \u51fd\u6570\u4e2d\uff0c\u90a3 ReactCurrentOwner.current<\/code>\u662f\u4e2a\u4ec0\u4e48\u9b3c\uff1f<\/p>\n
\u6211\u4eec\u6839\u636e\u5f15\u7528\u5730\u5740\u67e5\u770b ReactCurrentOwner<\/code>\u5b9a\u4e49\u7684\u6587\u4ef6<\/a>\uff1a<\/p>\n
<\/p>\n
\/**<\/span>\n * Keeps track of the current owner.<\/span>\n *<\/span>\n * The current owner is the component who should own any components that are<\/span>\n * currently being constructed.<\/span>\n *\/<\/span>\nconst<\/span> ReactCurrentOwner<\/span> =<\/span> {<\/span>\n  \/**<\/span>\n   * @internal<\/span>\n   * @type {ReactComponent}<\/span>\n   *\/<\/span>\n  current<\/span>: null<\/span>,<\/span>\n}<\/span>;<\/span>\n\nexport<\/span> default<\/span> ReactCurrentOwner<\/span>;<\/span><\/pre>\n<\/div>\n
\u5176\u521d\u59cb\u7684\u5b9a\u4e49\u975e\u5e38\u7b80\u5355\uff0c\u6839\u636e\u6ce8\u91ca\uff0c\u6211\u4eec\u53ef\u4ee5\u4e86\u89e3\u5230 ReactCurrentOwner.current<\/code> \u5c31\u662f\u6307\u5411\u5904\u4e8e\u6784\u5efa\u8fc7\u7a0b\u4e2d\u7684\u7ec4\u4ef6\u7684 owner\uff0c\u5177\u4f53\u4f5c\u7528\u5728\u4ee5\u540e\u7684\u6587\u7ae0\u4e2d\u8fd8\u6709\u4ecb\u7ecd\uff0c\u73b0\u5728\u53ef\u4ee5\u7b80\u5355\u7684\u7406\u89e3\u4e3a\uff0c\u5b83\u5c31\u662f\u7528\u4e8e\u8bb0\u5f55\u4e34\u65f6\u53d8\u91cf\u3002<\/p>\n
ReactElement<\/h2>\n
\u6e90\u7801<\/h3>\n
\u73b0\u5728\u6211\u4eec\u5f00\u59cb\u770b ReactElement  \u51fd\u6570\uff0c\u5176\u5b9e\u8fd9\u4e2a\u51fd\u6570\u7684\u5185\u5bb9\u66f4\u7b80\u5355\uff0c\u4ee3\u7801\u7cbe\u7b80\u540e\u5982\u4e0b\uff1a<\/p>\n
<\/p>\n
const<\/span> ReactElement<\/span> =<\/span> function<\/span>(<\/span>type<\/span>,<\/span> key<\/span>,<\/span> ref<\/span>,<\/span> self<\/span>,<\/span> source<\/span>,<\/span> owner<\/span>,<\/span> props<\/span>)<\/span> {<\/span>\n  const<\/span> element<\/span> =<\/span> {<\/span>\n    \/\/ This tag allows us to uniquely identify this as a React Element<\/span>\n    $$typeof<\/span>: REACT_ELEMENT_TYPE<\/span>,<\/span>\n\n    \/\/ Built-in properties that belong on the element<\/span>\n    type<\/span>: type<\/span>,<\/span>\n    key<\/span>: key<\/span>,<\/span>\n    ref<\/span>: ref<\/span>,<\/span>\n    props<\/span>: props<\/span>,<\/span>\n\n    \/\/ Record the component responsible for creating this element.<\/span>\n    _owner<\/span>: owner<\/span>,<\/span>\n  }<\/span>;<\/span>\n\n  return<\/span> element<\/span>;<\/span>\n}<\/span>;<\/span><\/pre>\n<\/div>\n
\u5982\u4f60\u6240\u89c1\uff0c\u5b83\u5c31\u662f\u8fd4\u56de\u4e00\u4e2a\u5bf9\u8c61\uff0c\u8fd9\u4e2a\u5bf9\u8c61\u5305\u62ec $$typeof<\/code>\u3001type<\/code>\u3001key<\/code> \u7b49\u5c5e\u6027\uff0c\u8fd9\u4e2a\u5bf9\u8c61\u5c31\u88ab\u79f0\u4e3a \u201cReact \u5143\u7d20\u201d\u3002\u5b83\u63cf\u8ff0\u4e86\u6211\u4eec\u5728\u5c4f\u5e55\u4e0a\u770b\u5230\u7684\u5185\u5bb9\u3002React \u4f1a\u901a\u8fc7\u8bfb\u53d6\u8fd9\u4e9b\u5bf9\u8c61\uff0c\u4f7f\u7528\u5b83\u4eec\u6784\u5efa\u548c\u66f4\u65b0 DOM<\/p>\n
REACT_ELEMENT_TYPE<\/h3>\n
\u800c REACT_ELEMENT_TYPE<\/code> \u67e5\u770b\u5f15\u7528\u7684 packages\/shared\/ReactSymbols<\/code> \u6587\u4ef6<\/a>\uff0c\u53ef\u4ee5\u53d1\u73b0\u5b83\u5c31\u662f\u4e00\u4e2a\u552f\u4e00\u5e38\u91cf\u503c\uff0c\u7528\u4e8e\u6807\u793a\u662f React \u5143\u7d20\u8282\u70b9<\/p>\n
\n
export<\/span> const<\/span> REACT_ELEMENT_TYPE<\/span> =<\/span> Symbol<\/span>.<\/span>for<\/span>(<\/span>'react.element'<\/span>)<\/span>;<\/span><\/pre>\n<\/div>\n
\u90a3\u8fd8\u6709\u5176\u4ed6\u7c7b\u578b\u7684\u8282\u70b9\u5417\uff1f \u67e5\u770b\u8fd9\u4e2a\u5b9a\u4e49 REACT_ELEMENT_TYPE<\/code> \u7684\u6587\u4ef6\uff0c\u6211\u4eec\u53d1\u73b0\u8fd8\u6709\uff1a<\/p>\n
<\/p>\n
export<\/span> const<\/span> REACT_PORTAL_TYPE<\/span>: symbol<\/span> =<\/span> Symbol<\/span>.<\/span>for<\/span>(<\/span>'react.portal'<\/span>)<\/span>;<\/span>\nexport<\/span> const<\/span> REACT_FRAGMENT_TYPE<\/span>: symbol<\/span> =<\/span> Symbol<\/span>.<\/span>for<\/span>(<\/span>'react.fragment'<\/span>)<\/span>;<\/span>\nexport<\/span> const<\/span> REACT_STRICT_MODE_TYPE<\/span>: symbol<\/span> =<\/span> Symbol<\/span>.<\/span>for<\/span>(<\/span>'react.strict_mode'<\/span>)<\/span>;<\/span>\nexport<\/span> const<\/span> REACT_PROFILER_TYPE<\/span>: symbol<\/span> =<\/span> Symbol<\/span>.<\/span>for<\/span>(<\/span>'react.profiler'<\/span>)<\/span>;<\/span>\nexport<\/span> const<\/span> REACT_PROVIDER_TYPE<\/span>: symbol<\/span> =<\/span> Symbol<\/span>.<\/span>for<\/span>(<\/span>'react.provider'<\/span>)<\/span>;<\/span>\nexport<\/span> const<\/span> REACT_CONTEXT_TYPE<\/span>: symbol<\/span> =<\/span> Symbol<\/span>.<\/span>for<\/span>(<\/span>'react.context'<\/span>)<\/span>;<\/span>\n\/\/ ...<\/span><\/pre>\n<\/div>\n
\u4f60\u53ef\u80fd\u4f1a\u81ea\u7136\u7684\u7406\u89e3\u4e3a $$typeof<\/code> \u8fd8\u53ef\u4ee5\u8bbe\u7f6e\u4e3a REACT_FRAGMENT_TYPE<\/code>\u7b49\u503c\u3002<\/p>\n
\u6211\u4eec\u53ef\u4ee5\u5199\u4ee3\u7801\u5b9e\u9a8c\u4e00\u4e0b\uff0c\u6bd4\u5982\u4f7f\u7528 Portal\uff0c\u6253\u5370\u4e00\u4e0b\u8fd4\u56de\u7684\u5bf9\u8c61\uff1a<\/p>\n
<\/p>\n
import<\/span> ReactDOM<\/span> from<\/span> 'react-dom\/client'<\/span>;<\/span>\nimport<\/span> {<\/span>createPortal<\/span>}<\/span> from<\/span> 'react-dom'<\/span>\n\nconst<\/span> root<\/span> =<\/span> ReactDOM<\/span>.<\/span>createRoot<\/span>(<\/span>document<\/span>.<\/span>getElementById<\/span>(<\/span>'root'<\/span>)<\/span>)<\/span>;<\/span>\n\nfunction<\/span> Modal<\/span>(<\/span>)<\/span> {<\/span>\n  const<\/span> portalObject<\/span> =<\/span> createPortal<\/span>(<\/span><<\/span>div<\/span> id<\/span>=<\/span>\"foo\"<\/span>><\/span>foo<<\/span>\/<\/span>div<\/span>><\/span>,<\/span> document<\/span>.<\/span>getElementById<\/span>(<\/span>\"root2\"<\/span>)<\/span>)<\/span>;<\/span>\n  console<\/span>.<\/span>log<\/span>(<\/span>portalObject<\/span>)<\/span>\n  return<\/span> portalObject<\/span>\n}<\/span>\n\nroot<\/span>.<\/span>render<\/span>(<\/span><<\/span>Modal<\/span> \/<\/span>><\/span>)<\/span>;<\/span><\/pre>\n<\/div>\n
\u6253\u5370\u7684\u5bf9\u8c61\u4e3a\uff1a
\n\"image.png\"<\/a>
\n\u5b83\u7684 $$typeof<\/code> \u786e\u5b9e\u662f REACT_PORTAL_TYPE<\/code><\/p>\n
\u800c\u5982\u679c\u6211\u4eec\u4f7f\u7528 Fragment<\/code>\uff1a<\/p>\n
<\/p>\n
import<\/span> ReactDOM<\/span> from<\/span> 'react-dom\/client'<\/span>;<\/span>\nimport<\/span> React<\/span> from<\/span> 'react'<\/span>;<\/span>\n\nconst<\/span> root<\/span> =<\/span> ReactDOM<\/span>.<\/span>createRoot<\/span>(<\/span>document<\/span>.<\/span>getElementById<\/span>(<\/span>'root'<\/span>)<\/span>)<\/span>;<\/span>\n\nfunction<\/span> Modal<\/span>(<\/span>)<\/span> {<\/span>\n  const<\/span> fragmentObject<\/span> =<\/span> (<\/span>\n    <<\/span>React<\/span>.<\/span>Fragment<\/span>><\/span>\n      <<\/span>div<\/span> id<\/span>=<\/span>\"foo\"<\/span>><\/span>foo<<\/span>\/<\/span>div<\/span>><\/span>\n    <<\/span>\/<\/span>React<\/span>.<\/span>Fragment<\/span>><\/span>\n    )<\/span>;<\/span>\n  console<\/span>.<\/span>log<\/span>(<\/span>fragmentObject<\/span>)<\/span>\n  return<\/span> fragmentObject<\/span>\n}<\/span>\n\nroot<\/span>.<\/span>render<\/span>(<\/span><<\/span>Modal<\/span> \/<\/span>><\/span>)<\/span>;<\/span><\/pre>\n<\/div>\n
\u6253\u5370\u7684\u5bf9\u8c61\u4e3a\uff1a
\n\"image.png\"<\/a>
\n\u6211\u4eec\u4f1a\u53d1\u73b0\uff0c\u5f53\u6211\u4eec\u4f7f\u7528 fragment<\/code> \u7684\u65f6\u5019\uff0c\u8fd4\u56de\u7684\u5bf9\u8c61\u7684 $$typeof<\/code> \u5374\u4f9d\u7136\u662f REACT_ELEMENT_TYPE<\/code> \u8fd9\u662f\u4e3a\u4ec0\u4e48\u5462?<\/p>\n
\u5176\u5b9e\u7ec6\u60f3\u4e00\u4e0b\u6211\u4eec\u4f7f\u7528 portals \u7684\u65f6\u5019\uff0c\u6211\u4eec\u7528\u7684\u662f  React.createPortal<\/code> \u7684\u65b9\u5f0f\uff0c\u4f46 fragments<\/code> \u8d70\u7684\u4f9d\u7136\u662f\u666e\u901a\u7684 React.createElement<\/code> \u65b9\u6cd5\uff0ccreateElement<\/code> \u7684\u4ee3\u7801\u6211\u4eec\u4e5f\u770b\u5230\u4e86\uff0c\u5e76\u65e0\u7279\u6b8a\u5904\u7406 $$typeof<\/code> \u7684\u5730\u65b9\uff0c\u6240\u4ee5\u81ea\u7136\u662f REACT_ELEMENT_TYPE<\/code><\/p>\n
\u90a3\u4e48 $$typeof<\/code> \u5230\u5e95\u662f\u4e3a\u4ec0\u4e48\u5b58\u5728\u5462\uff1f\u5176\u5b9e\u5b83\u4e3b\u8981\u662f\u4e3a\u4e86\u5904\u7406 web \u5b89\u5168\u95ee\u9898\uff0c\u8bd5\u60f3\u8fd9\u6837\u4e00\u6bb5\u4ee3\u7801\uff1a<\/p>\n
<\/p>\n
let<\/span> message<\/span> =<\/span> {<\/span> text<\/span>: expectedTextButGotJSON<\/span> }<\/span>;<\/span>\n\n\/\/ React 0.13 \u4e2d\u6709\u98ce\u9669<\/span>\n<<\/span>p<\/span>><\/span>\n  {<\/span>message<\/span>.<\/span>text<\/span>}<\/span>\n<<\/span>\/<\/span>p<\/span>><\/span><\/pre>\n<\/div>\n
\u5982\u679c expectedTextButGotJSON<\/code>\u662f\u6765\u81ea\u4e8e\u670d\u52a1\u5668\u7684\u503c\uff0c\u6bd4\u5982\uff1a<\/p>\n
<\/p>\n
\/\/ \u670d\u52a1\u7aef\u5141\u8bb8\u7528\u6237\u5b58\u50a8 JSON<\/span>\nlet<\/span> expectedTextButGotJSON<\/span> =<\/span> {<\/span>\n  type<\/span>: 'div'<\/span>,<\/span>\n  props<\/span>: {<\/span>\n    dangerouslySetInnerHTML<\/span>: {<\/span>\n      __html<\/span>: '\/* something bad *\/'<\/span>\n    }<\/span>,<\/span>\n  }<\/span>,<\/span>\n  \/\/ ...<\/span>\n}<\/span>;<\/span>\nlet<\/span> message<\/span> =<\/span> {<\/span> text<\/span>: expectedTextButGotJSON<\/span> }<\/span>;<\/span><\/pre>\n<\/div>\n
\u8fd9\u5c31\u5f88\u5bb9\u6613\u53d7\u5230 XSS \u653b\u51fb\uff0c\u867d\u7136\u8fd9\u4e2a\u653b\u51fb\u662f\u6765\u81ea\u670d\u52a1\u5668\u7aef\u7684\u6f0f\u6d1e\uff0c\u4f46\u4f7f\u7528 React \u6211\u4eec\u53ef\u4ee5\u5904\u7406\u7684\u66f4\u597d\u3002\u5982\u679c\u6211\u4eec\u7528 Symbol \u6807\u8bb0\u6bcf\u4e2a React \u5143\u7d20\uff0c\u56e0\u4e3a\u670d\u52a1\u7aef\u7684\u6570\u636e\u4e0d\u4f1a\u6709 Symbol.for('react.element')<\/code>\uff0cReact \u5c31\u53ef\u4ee5\u68c0\u6d4b element.$$typeof<\/code>\uff0c\u5982\u679c\u5143\u7d20\u4e22\u5931\u6216\u8005\u65e0\u6548\uff0c\u5219\u53ef\u4ee5\u62d2\u7edd\u5904\u7406\u8be5\u5143\u7d20\uff0c\u8fd9\u6837\u5c31\u4fdd\u8bc1\u4e86\u5b89\u5168\u6027\u3002<\/p>\n
\u56de\u987e<\/h2>\n
\u81f3\u6b64\uff0c\u6211\u4eec\u5b8c\u6574\u7684\u770b\u5b8c\u4e86 React.createElement<\/code> \u7684\u6e90\u7801\uff0c\u73b0\u5728\u6211\u4eec\u518d\u770b React \u5b98\u65b9\u6587\u6863\u7684\u8fd9\u6bb5\uff1a<\/p>\n
\u4ee5\u4e0b\u4e24\u79cd\u793a\u4f8b\u4ee3\u7801\u5b8c\u5168\u7b49\u6548\uff1a<\/p>\n
<\/p>\n
const<\/span> element<\/span> =<\/span> (<\/span>\n  <<\/span>h1<\/span> className<\/span>=<\/span>\"greeting\"<\/span>><\/span>\n    Hello, world!\n  <<\/span>\/<\/span>h1<\/span>><\/span>\n)<\/span>;<\/span>\n\nconst<\/span> element<\/span> =<\/span> React<\/span>.<\/span>createElement<\/span>(<\/span>\n  'h1'<\/span>,<\/span>\n  {<\/span>className<\/span>: 'greeting'<\/span>}<\/span>,<\/span>\n  'Hello, world!'<\/span>\n)<\/span>;<\/span><\/pre>\n<\/div>\n
React.createElement() \u4f1a\u9884\u5148\u6267\u884c\u4e00\u4e9b\u68c0\u67e5\uff0c\u4ee5\u5e2e\u52a9\u4f60\u7f16\u5199\u65e0\u9519\u4ee3\u7801\uff0c\u4f46\u5b9e\u9645\u4e0a\u5b83\u521b\u5efa\u4e86\u4e00\u4e2a\u8fd9\u6837\u7684\u5bf9\u8c61\uff1a<\/p>\n
<\/p>\n
\/\/ \u6ce8\u610f\uff1a\u8fd9\u662f\u7b80\u5316\u8fc7\u7684\u7ed3\u6784<\/span>\nconst<\/span> element<\/span> =<\/span> {<\/span>\n  type<\/span>: 'h1'<\/span>,<\/span>\n  props<\/span>: {<\/span>\n    className<\/span>: 'greeting'<\/span>,<\/span>\n    children<\/span>: 'Hello, world!'<\/span>\n  }<\/span>\n}<\/span>;<\/span><\/pre>\n<\/div>\n
\u8fd9\u4e9b\u5bf9\u8c61\u88ab\u79f0\u4e3a \u201cReact \u5143\u7d20\u201d\u3002\u5b83\u4eec\u63cf\u8ff0\u4e86\u4f60\u5e0c\u671b\u5728\u5c4f\u5e55\u4e0a\u770b\u5230\u7684\u5185\u5bb9\u3002React \u901a\u8fc7\u8bfb\u53d6\u8fd9\u4e9b\u5bf9\u8c61\uff0c\u7136\u540e\u4f7f\u7528\u5b83\u4eec\u6765\u6784\u5efa DOM \u4ee5\u53ca\u4fdd\u6301\u968f\u65f6\u66f4\u65b0\u3002<\/p>\n
\u73b0\u5728\u4f60\u5bf9\u8fd9\u6bb5\u662f\u4e0d\u662f\u6709\u4e86\u66f4\u52a0\u6df1\u5165\u7684\u8ba4\u8bc6\uff1f<\/p>\n
React \u7cfb\u5217<\/h2>\n
\u8bb2\u89e3 React \u6e90\u7801\u3001React API \u80cc\u540e\u7684\u5b9e\u73b0\u673a\u5236\uff0cReact \u6700\u4f73\u5b9e\u8df5\u3001React \u7684\u53d1\u5c55\u4e0e\u5386\u53f2\u7b49\uff0c\u9884\u8ba1 50 \u7bc7\u5de6\u53f3\uff0c\u6b22\u8fce\u5173\u6ce8<\/p>\n
\u5982\u679c\u559c\u6b22\u6216\u8005\u6709\u6240\u542f\u53d1\uff0c\u6b22\u8fce star\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\/316<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
React \u4e0e Babel \u5143\u7d20\u6807\u7b7e\u8f6c\u8bd1 \u7528\u8fc7 React \u7684\u540c\u5b66\u90fd\u77e5\u9053\uff0c\u5f53\u6211\u4eec\u8fd9\u6837\u5199\u65f6\uff1a <div id=”foo”>bar<\/div&gt…<\/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-1352","post","type-post","status-publish","format-standard","hentry","category-learn"],"_links":{"self":[{"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/posts\/1352"}],"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=1352"}],"version-history":[{"count":1,"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/posts\/1352\/revisions"}],"predecessor-version":[{"id":1460,"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/posts\/1352\/revisions\/1460"}],"wp:attachment":[{"href":"https:\/\/www.lccc.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1352"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.lccc.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1352"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.lccc.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1352"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}