<html><head><script type="text/javascript">function checkLen(x,y){if (y.length==x.maxLength) { var next=x.tabIndex if (next<document.getElementById("myForm").length) { document.getElementById("myForm").elements[next].focus() } }}</script></head>
<body><p>这段脚本在达到文本框的最大长度时跳到下一个文本框：</p>
<form id="myForm"><input size="3" tabindex="1" maxlength="3" οnkeyup="checkLen(this,this.value)"><input size="2" tabindex="2" maxlength="2" οnkeyup="checkLen(this,this.value)"><input size="3" tabindex="3" maxlength="3" οnkeyup="checkLen(this,this.value)"></form></body>
</html>
