类对象的方法with和in

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">  <html xmlns="http://www.w3.org/1999/xhtml">  <head>  <meta http-equiv="Content-Type" content="text/html; charset=gb2312" />  <title>无标题文档</title>  </head>    <body>  <script type="text/javascript" >  function Student(name,age)  {      this.name=name;      this.age=age;  }  var xiaozhi=new Student("xiaozhi",21);  with(xiaozhi)  {      alert(name+"...."+age);        }  for( s in xiaozhi)//s是属性名 name xiaozhi age 21 {      ///alert(s+"........"+xiaozhi[s]);  }  var a=[1,6,2,5,9];  for(x in a)  //01234{     // alert(x+"............."+a[x]);  }      </script>  </body>  </html>