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js滑鼠滾軸控制文字框值

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[javascript] 
<html> 
 
<head> 
 
<title></title> 
<script type="text/javascript" language="javascript"> 
     
    /*根據獲得焦點的時候給setVal給值*/ 
    var setVal;   
    var bool = false;     
    var scrollFunc=function(e){  
        var direct=0;  
        e=e || window.event;  
        var ew = e.wheelDelta 
        if(ew && bool){ 
            if(ew > 0){ 
                var num1 = setVal.value; 
                if(num1 > 0){ 
                    num1 = eval(1+parseInt(num1)); 
                }else{ 
                    num1 = 1; 
                } 
            }else{ 
                var num1 = setVal.value; 
                if(num1 > 0){ 
                    num1 = eval(parseInt(num1)-1); 
                }else if(num1 == 0){ 
                    num1 = 0; 
                }else{ 
                    num1 = 1; 
                }    
            } 
             
            setVal.value = num1; 
        } 
        
    }  
 
    window.onmousewheel=document.onmousewheel=scrollFunc; 
     
    function ufocus(eve){ 
        bool = true; 
        setVal = eve; 
    } 
     
    function ublur(){ 
        bool = false; 
        setVal = null; 
    } 
</script> 
</head> 
 
<body> 
<input type="text" onfocus="ufocus(this)" onblur="ublur(this)"/> 
</body> 
 
</html> 

<html>

<head>

<title></title>
<script type="text/javascript" language="javascript">
   
    /*根據獲得焦點的時候給setVal給值*/
    var setVal; 
    var bool = false;   
    var scrollFunc=function(e){
        var direct=0;
        e=e || window.event;
        var ew = e.wheelDelta
        if(ew && bool){
            if(ew > 0){
                var num1 = setVal.value;
                if(num1 > 0){
                    num1 = eval(1+parseInt(num1));
                }else{
                    num1 = 1;
                }
            }else{
                var num1 = setVal.value;
                if(num1 > 0){
                    num1 = eval(parseInt(num1)-1);
                }else if(num1 == 0){
                    num1 = 0;
                }else{
                    num1 = 1;
                }  
            }
           
            setVal.value = num1;
        }
      
    }

    window.onmousewheel=document.onmousewheel=scrollFunc;
   
    function ufocus(eve){
        bool = true;
        setVal = eve;
    }
   
    function ublur(){
        bool = false;
        setVal = null;
    }
</script>
</head>

<body>
<input type="text" onfocus="ufocus(this)" onblur="ublur(this)"/>
</body>

</html>
 

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