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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>endsWith</title>
  <script type="text/javascript">
    //判断一个网址的类型
    function judgeUrl(str){
      if(str.endsWith('.jpg')){
        console.log(str+':这是jpeg格式图片');
      }else if(str.endsWith('.png')){
        console.log(str+':这是png格式图片');
      }else if(str.endsWith('.gif')){
        console.log(str+':这是gif格式图片');
      }else if(str.endsWith('.bmp')){
        console.log(str+':这是bmp格式图片');
      }else{
        console.log('其它!');
      }
    }
  </script>
</head>
<body>
  <button onclick="judgeUrl('aaa.jpg');">aaa.jpg</button>
  <button onclick="judgeUrl('aaa.png');">aaa.png</button>
  <button onclick="judgeUrl('aaa.gif');">aaa.gif</button>
  <button onclick="judgeUrl('aaa.bmp');">aaa.bmp</button>
  <button onclick="judgeUrl('aaa.doc');">aaa.doc</button>
</body>
</html>
Output 300px

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