<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>jstest</title> <link rel="stylesheet" type="text/css" href="style.css"/> <script type="text/javascript" src="base.js"></script> <script type="text/javascript" src="js.js"></script> </head> <body> <form id="myForm" name="yourForm"> <input type="text" name="a1" id="a1" value="" maxlength="1" /> <input type="text" name="a1" id="a1" value="" maxlength="3" /> <input type="text" name="a1" id="a1" value="" maxlength="5" /> 姓名：<input type="text" name="user" value="text" /><br /> <textarea name="content" rows="" cols="" style=" 200px;">dsfsafsdafdsafdf dsfsd</textarea> </form> </body> </html>
//跨浏览器添加事件 function addEvent(obj,type,fn){ if(obj.addEventListener){ obj.addEventListener(type,fn,false); }else if(obj.attachEvent){ obj.attachEvent('on'+type,fn); } } addEvent(window,'load',function(){ var fm = document.forms['yourForm']; var user = fm.elements['user']; var content = fm.elements['content']; addEvent(fm.elements['a1'],'keyup',tabForWard); addEvent(fm.elements['a2'],'keyup',tabForWard); addEvent(fm.elements['a3'],'keyup',tabForWard); function tabForWard(evt){ var e = evt || window.event; //判断当前的长度是否和已输入的长度是否一致 if(this.value.length == this.maxLength){ //遍历所有控件 for(var i = 0; i< fm.elements.length; i++){ if(fm.elements[i] == this){ fm.elements[i+1].focus(); return; } } } } });