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<script id="clienteventhandlersjs" language="javascript">
<!–
function t1_onkeyup() {
if(document.card.t1.value.length==4){
document.card.t2.focus();
}
}
function t2_onkeyup() {
if(document.card.t2.value.length==4){
document.card.t3.focus();
}
}
function t3_onkeyup() {
if(document.card.t3.value.length==4){
document.card.t4.focus();
}
}
//–>
</script>
在<body>…</body>之间加入如下代码：
<form method="post" name="card" action>
输入字符：
<input type="text" name="t1" size="4" maxlength="4" language="javascript" onkeypress="return t1_onkeyup()">-
<input type="text" name="t2" size="4" maxlength="4" language="javascript" onkeypress="return t2_onkeyup()">-
<input type="text" name="t3" size="4" maxlength="4" language="javascript" onkeypress="return t3_onkeyup()">-
<input type="text" name="t4" size="4" maxlength="4">
</form>
