这篇文章将为大家详细讲解有关js输入框如何使用正则表达式校验输入内容，小编觉得挺实用的，因此分享给大家做个参考，希望大家阅读完这篇文章后可以有所收获。
源码如下所示：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
用户名:<input type="text"name = "user" id="user"/>
<span id="userSpan" ></span>
<br />
密码:<input type="text"name = "pwd" id="pwd"/>
<span id="pwdSpan" ></span>
<br />
确认密码:<input type="text"name = "pwd2" id="pwd2"/>
<span id="pwd2Span" ></span>
<br />
邮箱:<input type="text"name = "email" id="email"/>
<span id="emailSpan" ></span>
<br />
手机号:<input type="text"name = "phone" id="phone"/>
<span id="phoneSpan" ></span>
<br />
身份证号:<input type="text"name = "status" id="status"/>
<span id="statusSpan" ></span>
<br />
地址:<input type="text"name = "address" id="address"/>
<span id="addressSpan" ></span>
<br />
<input type="button" value="校验" onclick="verify()" />
<script type="text/javascript">
function verify() {
//用户名验证
var user = "";
user = document.getElementById("user").value;
var pattl = /^[A-Z][a-zA-Z0-9_]{6,20}$/;
var result = pattl.test(user.trim());
if (result) {
document.getElementById("userSpan").innerHTML = "√"
document.getElementById("userSpan").style.fontSize = "20pt"
} else {
document.getElementById("userSpan").innerHTML = "×"
}
//密码验证
var pwd = "";
pwd = document.getElementById("pwd").value;
var pattl = /^[A-Z][a-zA-Z0-9_]{8,15}$/;
var result = pattl.test(pwd.trim());
if (result) {
document.getElementById("pwdSpan").innerHTML = "√"
document.getElementById("pwdSpan").style.fontSize = "20pt"
} else {
document.getElementById("pwdSpan").innerHTML = "×"
}
//确认密码验证
var pwds = "";
pwds = document.getElementById("pwd2").value;
var pattl = /^[A-Z][a-zA-Z0-9_]{8,15}$/;
var result = pattl.test(pwds.trim());
if (result) {
document.getElementById("pwd2Span").innerHTML = "√"
document.getElementById("pwd2Span").style.fontSize = "20pt"
} else {
document.getElementById("pwd2Span").innerHTML = "×"
}
//邮箱验证
var emails = "";
emails = document.getElementById("email").value;
var pattl = /^[A-z0-9]+@[a-z0-9]+.com$/;
var result = pattl.test(emails.trim());
if (result) {
document.getElementById("emailSpan").innerHTML = "√"
document.getElementById("emailSpan").style.fontSize = "20pt"
} else {
document.getElementById("emailSpan").innerHTML = "×"
}
//手机号验证
var phones = "";
phones = document.getElementById("phone").value;
var pattl = /^(13[0-9]|14[5|7]|15[0|1|2|3|5|6|7|8|9]|18[0|1|2|3|5|6|7|8|9])\d{8}$/;
var result = pattl.test(phones.trim());
if (result) {
document.getElementById("phoneSpan").innerHTML = "√"
document.getElementById("phoneSpan").style.fontSize = "20pt"
} else {
document.getElementById("phoneSpan").innerHTML = "×"
}
//身份证号验证
var status1 = "";
status1 = document.getElementById("status").value;
var pattl = /^([1-9]){1}[0-9]{17}|[1-9]{1}[0-9]{16}(x|X)?$/;
var result = pattl.test(status1.trim());
if (result) {
document.getElementById("statusSpan").innerHTML = "√"
document.getElementById("statusSpan").style.fontSize = "20pt"
} else {
document.getElementById("statusSpan").innerHTML = "×"
}
//地址验证
var addres = "";
addres = document.getElementById("address").value;
var pattl = /^[\u4e00-\u9fa5]+[\u4E00-\u9FA5A-Za-z0-9_]+$/;
var result = pattl.test(addres.trim());
if (result) {
document.getElementById("addressSpan").innerHTML = "√"
document.getElementById("addressSpan").style.fontSize = "20pt"
} else {
document.getElementById("addressSpan").innerHTML = "×"
}
}
</script>
</body>
</html>效果图如下：
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