页面验证输入的数据是不小于0的数字

 

JS代码：

<script language="javascript">

String.prototype.mytrim = function()

 {

 return this.replace(/(^\s*)|(\s*$)/g, "");

 }

 

String.prototype.myLTrim = function()

{

return this.replace(/(^\s*)/g, "");

}

 

String.prototype.myRTrim = function()

{

return this.replace(/(\s*$)/g, "");

}

 

 

    function ckeckNum(){

         

     var s =document.getElementById("number").value;

    

    if(s.mytrim() == "") {

    

        alert("不能为空");

                                

        return false;

     }

   

     if(isNaN(s))

     {

        alert("应为数字");

                                

        return false;

                                

     }

    

     if(s<0)

     {

        alert("不得小于0");

                                

        return false;

                                

      }

     

      return true;

    

  }

 

 

 页面组件：

<td><html:text property="number"

              maxlength="8" style="width:50px">html:text>

%td>