js中substring或split方法取得URL中的域名

1、split方式

<html>
<head></head>
<body onload="convertTemp()">

<script language="javaScript">

function convertTemp()
{
   var the_url = prompt("What's the URL?","");

   var first_split = the_url.split("//");

   alert(first_split[0]);
  
   var without_resource = first_split[1];

   var second_split = without_resource.split("/");

   var domain = second_split[0];
  
   alert(domain);

}

</script>

</body>
</html>

2、substring方式

<html>
<head></head>
<body onload="convertTemp()">

<script language="javaScript">

function convertTemp()
{
   var the_url = prompt("What's the URL?","");

   var lead_slashes = the_url.indexOf("//");

   var domain_start = lead_slashes + 2;

   var without_resource = the_url.substring(domain_start, the_url.length);

   var next_slash = without_resource.indexOf("/");

   var domain = without_resource.substring(0, next_slash);
  
   alert(domain);

}

</script>

</body>
</html>

执行效果图：

 

posted @ 2015-01-09 20:02  zfyouxi  阅读(789)  评论(0)    收藏  举报