老师，帮检查一下

来源：2-4 编程练习

慕尼黑9422427

2021-07-05 16:34:50

<!DOCTYPE html>
<html>
<head>
   <meta charset="UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <title>Document</title>
</head>
<body>
   <script>

       // 3.应用
      let url = 'https://www.imooc.com/course/list?';
      let url1 ='https://www.imooc.com/course/list?username=xm';
      let url2 ='https://www.imooc.com/course/list?username=xm&';

      const addURLParam = (url, name, value) => {
         // 在此补充代码
        if(url.includes('?')){
            if(url.sbustr(b
            url.length-1,1).includes('?')||url.sbustr(url.length-1,1).includes('&')){
                url+='';
            }else{
                url+='&';
            }
        }else{
            url+='?';
        }
         url += `${name}=${value}`;
        return url;
      };
      url = addURLParam(url, 'password', 'admin');
      url1 =  addURLParam(url1, 'password', 'admin');
      url2 =  addURLParam(url2, 'password', 'admin');
      document.write(url,'<br>');
      document.write(url1,'<br>');
      document.write(url2,'<br>');
   </script>
</body>
</html>