js实现的类似QQ的等级的代码

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html>     <head>         <meta http-equiv="Content-Type" content="text/html; charset=GB2312" />         <title>类似QQ等级</title>         <script type="text/javascript">         function $(obj){             return document.getElementById(obj);         }         function checkIsInteger(str){              if(str == "")          return false;          if(/^(\-?)(\d+)$/.test(str)) return true; else return false; }          function t(num){              var str = "";             var sun = Math.floor(num/640);             for(var i = 0;i < sun;i++)                 str += "●";             var month = Math.floor(num/160)%4;             for(var j = 0;j < month;j++)                 str += "?";             var star = Math.floor(num/40)%4;             for(var k = 0;k < star;k ++)                 str += "★";             window.alert(str);                       }          String.prototype.trim = function(){              return this.replace(/(^[\s]*)|([\s]*$)/g, "");      }          window.onload = function(){              $("btn").onclick = function(){                         if(checkIsInteger($("txt").value.trim())){                     t($("txt").value.trim());                 }else{                     alert("只能是数字");                 }              }          }         </script>     </head>     <body>         <input type="text" id="txt" />         <input type="button" value="Go" id="btn" />     </body> </html>

[Ctrl+A 全选注:引入外部Js需再刷新一下页面才能执行]

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js实现的类似QQ的等级的代码

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