<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
p{
color: red;
}
</style>
</head>
<body>
用户名：<input type="text" id="inp">
<br>
<p></p>
密码:<input type="password" id="inp2">
<br>
<button onclick="show()">提交</button>
<script>
var input = document.getElementById('inp');
var inpu2 = document.getElementById('inp2');
//获取p
var p =document.getElementsByTagName('p')[0];
//
function show(){
var str = input.value;
// var reg = /\w{6,12}/;
var reg =/^[A-z]\w{5,11}$/;//精确匹配
var index = str.match(reg);
console.log(index);
if(index == null){
p.innerHTML = '用户名格式不正确，请输入数字，字母，下划线';
}
var s = inpu2.value;
var r = /\d{8,12}/;
if(s.match(r) == null){
alert('格式不对');
}
}
</script>
</body>
</html>
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