判断整数

最新推荐文章于 2024-07-18 10:51:42 发布

最新推荐文章于 2024-07-18 10:51:42 发布 · 212 阅读

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#JavaScript #C #C++ #C# #.net #ViewUI

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<SCRIPT   language=JavaScript>  
  function   IsNum(theField)  
  {  
  if   (!IsNum2(theField.value))  
        {alert("该区域只能输入数字！");  
  theField.value   ="";  
  theField.focus();}  
  }  
  function   IsNum2(s)  
  {  
  var   Number   =   "0123456789.";  
  for   (i   =   0;   i   <   s.length;i++)  
          {        
                  //   Check   that   current   character   isn't   whitespace.  
                  var   c   =   s.charAt(i);  
                  if   (Number.indexOf(c)   ==   -1)   return   false;  
          }  
  return   true  
  }  
  </script>  
  <input   name=a123   type=text   onblur=IsNum(this)>

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