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  String.prototype.times = function(n) {//IE6 530-640 FF3 400~550 IE8 840 ~1110   chrome 600~1000
    return (new Array(n+1)).join(this);
  };
 
<!doctype html>
<html dir="ltr" lang="zh-CN">
  <head>
    <meta charset="utf-8"/>
    <title>×Ö·û´®µÄ³Ë·¨</title>
    <script type="text/javascript" charset="utf-8">
      window.onload = function(){
  String.prototype.times = function(n) {
    return (new Array(n+1)).join(this);
  };
    var s = "˾ͽÕýÃÀ"
    var start = new Date();
    a = s.times(1000000);
    var end = new Date();
    alert("ËùºÄʱ¼ä "  + (end-start));
      
      }
    </script>
  </head>
  <body>
   <pre>
  String.prototype.times = function(n) {
    return (new Array(n+1)).join(this);
  };
    var s = "˾ͽÕýÃÀ"
    var start = new Date();
    a = s.times(1000000);
    var end = new Date();
    alert("ËùºÄʱ¼ä "  + (end-start));
   </pre>
  </body>
</html>
 
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        String.prototype.times = function(n) {//IE6 570~600  FF3 320~430  chrome 550~900 IE8 422~490
          return Array.prototype.join.call({length:n+1}, this);
        };
 
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var paras = document.getElementsByTagName("input");//ȫѡcheckbox
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