javascript实现依次输入input自动定焦


<html> 

<head> 

<script type="text/javascript"> 

    function moveNext(object,index){ 

        if(object.value.length==4){ 

            document.forms[0].elements[index+1].focus(); 

        } 

    } 

    function showResult(){ 

        var f=document.forms[0]; 

        var result=""; 

        for(var i=0;i<4;i++){ 

            result+=f.elements[i].value; 

        } 

        alert(result); 

    }

</script>

</head> 

<body onload="document.forms[0].elements[0].focus();"> 

    <form> 

        <input type="text" size="3" maxlength="4" onkeyup="moveNext(this,0);"> 

        <input type="text" size="3" maxlength="4" onkeyup="moveNext(this,1);"> 

        <input type="text" size="3" maxlength="4" onkeyup="moveNext(this,2);"> 

        <input type="text" size="3" maxlength="4" onkeyup="moveNext(this,3);"> 

        <input type="button" value="显示" onclick="showResult();"> 

    </form> 

</body> 

</html>

代码很简单，功能非常实用，小伙伴们美化下就可以用到自己项目中了，是不是很炫酷