js扩展startWith,endWith函数

gwcgwcjava

于 2014-12-17 20:32:55 发布

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分类专栏： js

本文链接：https://blog.youkuaiyun.com/gwcgwcjava/article/details/41986771

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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>
<script type="text/javascript">
	String.prototype.endWith=function(s){
  if(s==null||s==""||this.length==0||s.length>this.length)
     return false;
  if(this.substring(this.length-s.length)==s)
     return true;
  else
     return false;
  return true;
 }
 String.prototype.startWith=function(s){
  if(s==null||s==""||this.length==0||s.length>this.length)
   return false;
  if(this.substr(0,s.length)==s)
     return true;
  else
     return false;
  return true;
 }
 
 function showInfo(obj){
	 alert(obj.value.endWith('dd'));
	 alert(obj.value.startWith('gg'));
	 }
</script>
</head>

<body>
<input type="text" value=""  οnblur="showInfo(this)"/>
</body>
</html>