{"id":309,"date":"2025-08-02T21:28:00","date_gmt":"2025-08-02T13:28:00","guid":{"rendered":"https:\/\/mitongxue.cn\/?p=309"},"modified":"2026-06-10T21:35:36","modified_gmt":"2026-06-10T13:35:36","slug":"react%e7%bb%84%e4%bb%b6%e4%b8%8e%e4%ba%8b%e4%bb%b6%e7%bb%91%e5%ae%9a","status":"publish","type":"post","link":"https:\/\/mitongxue.cn\/index.php\/2025\/08\/02\/react%e7%bb%84%e4%bb%b6%e4%b8%8e%e4%ba%8b%e4%bb%b6%e7%bb%91%e5%ae%9a\/","title":{"rendered":"React\u7ec4\u4ef6\u4e0e\u4e8b\u4ef6\u7ed1\u5b9a"},"content":{"rendered":"\n

React<\/em> \u4e2d\u7684\u7ec4\u4ef6<\/h2>\n\n\n\n

\u5728 React<\/em> \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u7c7b\u7684\u65b9\u5f0f\u6765\u58f0\u660e\u4e00\u4e2a\u7ec4\u4ef6\u3002<\/p>\n\n\n\n

class \u7c7b\u540d extends React.Component{
  render(){
    return (
        \/\/ \u4e00\u6bb5 JSX
    )
  }
}<\/code><\/pre>\n\n\n\n
\u9664\u4e86\u7c7b\u7ec4\u4ef6\uff0cReact<\/em> \u4e2d\u8fd8\u652f\u6301\u4f7f\u7528\u51fd\u6570\u6765\u521b\u5efa\u7ec4\u4ef6\uff0c\u540c\u6837\u9700\u8981\u8fd4\u56de\u4e00\u6bb5 JSX<\/em>\uff0c\u6765\u8868\u793a\u8fd9\u4e2a\u7ec4\u4ef6\u7684 UI<\/em> \u662f\u4ec0\u4e48\u6837\u7684\u3002<\/p>\n\n\n\n
function \u7ec4\u4ef6\u540d(){
  return (
    \/\/ \u4e00\u6bb5 JSX
  );
}<\/code><\/pre>\n\n\n\n
\u65e9\u671f<\/strong>\u7684\u51fd\u6570\u7ec4\u4ef6\u88ab\u79f0\u4e4b\u4e3a\u65e0\u72b6\u6001\u7ec4\u4ef6\uff0c\u4e00\u822c\u4ec5\u4ec5\u7528\u6765\u505a\u7eaf UI<\/em> \u7684\u5c55\u793a\uff0c\u91cc\u9762\u4e0d\u4f1a\u6709\u590d\u6742\u7684\u903b\u8f91\u3002<\/p>\n\n\n\n
\u4f46\u662f\u4ece React 16.8<\/em> \u63a8\u51fa Hooks<\/em> \u540e\uff0c\u73b0\u5728\u66f4\u591a\u7684\u662f\u4f7f\u7528\u51fd\u6570\u7ec4\u4ef6\u4e86\u3002<\/p>\n\n\n\n
\u8fd9\u4e0d\u4ec5\u4ec5\u662f\u8bed\u6cd5\u7684\u6539\u53d8\uff0c\u540c\u65f6\u4e5f\u4ee3\u8868\u7740\u6574\u4e2a React<\/em> \u7f16\u7a0b\u601d\u60f3\u7684\u4e00\u79cd\u8f6c\u53d8\u3002<\/p>\n\n\n\n
\u4e3a\u7ec4\u4ef6\u7ed1\u5b9a\u4e8b\u4ef6<\/h2>\n\n\n\n
\u5728 React<\/em> \u4e2d\u7ed1\u5b9a\u4e8b\u4ef6\u7684\u5199\u6cd5\u5982\u4e0b\uff1a<\/p>\n\n\n\n
<button onClick={activateLasers}>Activate Lasers<\/button><\/code><\/pre>\n\n\n\n
\u5728 React<\/em> \u4e2d\u65e0\u6cd5\u901a\u8fc7 return false<\/em> \u6765\u963b\u6b62\u9ed8\u8ba4\u884c\u4e3a\uff0c\u6240\u4ee5\u53ea\u6709\u4f7f\u7528 e.preventDefault<\/em> \u7684\u65b9\u5f0f\u6765\u963b\u6b62\u9ed8\u8ba4\u884c\u4e3a\u3002<\/p>\n\n\n\n
function Form() {
  function handleSubmit(e) {
    e.preventDefault();
    console.log('You clicked submit.');
  }
\u200b
  return (
    <form onSubmit={handleSubmit}>
      <button type=\"submit\">Submit<\/button>
    <\/form>
  );
}<\/code><\/pre>\n\n\n\n
\u5982\u679c\u662f\u7c7b\u7ec4\u4ef6\uff0c\u90a3\u4e48\u4e8b\u4ef6\u5904\u7406\u51fd\u6570\u5199\u4f5c\u4e00\u4e2a\u7c7b\u65b9\u6cd5\u3002<\/p>\n\n\n\n
class Welcome extends React.Component {
  \/\/ \u4e8b\u4ef6\u5904\u7406\u51fd\u6570
  eventHandler(e){
    window.alert('Hello');
    e.preventDefault();
  }
  
  render() {
    return (
      <a href=\"https:\/\/www.baidu.com\/\" onClick={this.eventHandler}>this is a test<\/a>
    );
  }
}<\/code><\/pre>\n\n\n\n
\u5728 React<\/em> \u7684\u4e8b\u4ef6\u5904\u7406\u51fd\u6570\u4e2d\u6240\u4f20\u5165\u7684\u4e8b\u4ef6\u5bf9\u8c61\uff0c\u662f\u4e00\u4e2a\u5408\u6210\u4e8b\u4ef6\u5bf9\u8c61\u3002<\/p>\n\n\n\n
React<\/em> \u4e5f\u63d0\u4f9b\u4e86\u8bbf\u95ee\u539f\u751f\u4e8b\u4ef6\u5bf9\u8c61\u7684\u65b9\u5f0f\u3002\u5982\u4e0b\uff1a<\/p>\n\n\n\n
eventHandler(e){
    e.nativeEvent \/\/ \u539f\u751f\u4e8b\u4ef6\u5bf9\u8c61
}<\/code><\/pre>\n\n\n\n
this<\/em> \u7684\u6307\u5411<\/h2>\n\n\n\n
\u7531\u4e8e JS<\/em> \u4e2d this<\/em> \u7684\u7279\u6b8a\u6027\uff0c\u4e8b\u4ef6\u5904\u7406\u51fd\u6570\u4e2d\u7684 this<\/em> \u5e76\u4e0d\u4f1a\u6307\u5411\u5f53\u524d\u7684\u7ec4\u4ef6\uff0c\u8fd9\u5c31\u9700\u8981\u6211\u4eec\u81ea\u884c\u5bf9 this<\/em> \u8fdb\u884c\u6307\u5411\u7684\u4fee\u6b63\u3002<\/p>\n\n\n\n
\u8fd9\u91cc\u4ecb\u7ecd 3<\/em> \u79cd\u89e3\u51b3\u65b9\u5f0f\uff1a<\/p>\n\n\n\n