js扩展startWith,endWith函数

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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=""  onblur="showInfo(this)"/></body></html>

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