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!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>
RunJS 演示代码
</title>
<style>
*{
margin:0;
padding:0;
}
#wrap {
margin:auto;
width: 300px;
}
#wrap input[type=text]{
width:30px;
height:20px;
float:left;
text-align:center;
}
</style>
<script>
onload = function(){
var txts = wrap.getElementsByTagName("input");
for(var i = 0; i<txts.length;i++){
var t = txts[i];
t.index = i;
t.setAttribute("readonly", true);
t.onkeyup=function(){
this.value=this.value.replace(/^(.).*$/,‘$1‘);
var next = this.index + 1;
if(next > txts.length - 1) return;
txts[next].removeAttribute("readonly");
txts[next].focus();
}
}
txts[0].removeAttribute("readonly");
}
</script>
</head>
<body>
<div id="wrap">
<input type="text" />
<input type="text" />
<input type="text" />
<input type="text" />
<input type="text" />
<input type="text" />
</div>
</body>
</html>
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原文地址：http://www.cnblogs.com/sure2016/p/5850241.html
