贴一段自动跳转文本的代码实现：
实现代码：
<html>
<head>
<title>文本跳转</title>
<style type=text/css>
body{
MARGIN-TOP: 10px;
FONT-SIZE: 10pt;
MARGIN-LEFT: 10px;
MARGIN-RIGHT: 0px;
FONT-FAMILY: "微软雅黑"
}
</style>
<meta http-equiv=Content-Type content="text/html; charset=gb2312">
</head>
<body>
<script type="text/javascript">
function InBox1() {
if(document.code.Box1.value.length == 4) {
document.code.Box2.focus();
}
}
function InBox2() {
if(document.code.Box2.value.length == 4) {
document.code.Box3.focus();
}
}
function InBox3() {
if(document.code.Box3.value.length == 4) {
document.code.Box4.focus();
}
}
</script>
<formname="code" action="" method="post">输入：
<input maxLength="4" size="4" name="Box1" onkeyup="return InBox1()">-
<input maxLength="4" size="4" name="Box2" onKeyUp="return InBox2()">-
<input maxLength="4" size="4" name="Box3" onKeyUp="return InBox3()">-
<input maxLength="4" size="4" name="Box4">
</form>
</body>
</html>