JS常见的表单验证，H5自带的验证和正则表达式的验证

H5验证

自带的验证无法满足需求：

<form action="" method="get">
    name:<input type="text" name="name"><br>
    email:<input type="email" name="email"><br>
    age:<input type="number" name="number"><br>
    <input type="submit">
</form>

几十输入不科学的数据依然能够通过验证

接下来是一个表单验证的案例

index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
            margin:0;
            padding:0;
        }
        body{
            background-color: rgb(231,230,232);
        }
        .container{
            width:1000px;
            margin:50px auto;
            border-radius:5px;
            font-size:12px;
            box-shadow:3px 3px 3px #ccc;
            color:#333;
        }
        .container h3{
            background-color: rgb(97,134,213);
            text-align: center;
            color:#fff;
            padding:10px;
            border-radius:5px 5px 0 0;
            letter-spacing: .5em;
        }
        .item{
            height:49px;
            padding:10px 50px;
            background-color: #fff;
            border-bottom:1px solid #444;
            position: relative;
        }
        .item label{
            font-weight:bold;
            display: inline-block;
            margin-top:10px;
        }
        .item input{
            width:400px;
            height:20px;
            line-height:20px;
            border-radius:5px;
            border:1px solid #ccc;
            padding:5px;
            position: absolute;
            left:150px;
        }
        .item span{
            color:rgb(97,134,213);
        }
        /*设置placeholder字体颜色*/
        input::-webkit-input-placeholder {      /* WebKit browsers */
            color: #ccc;
            font-size:12px;
        }
        input:-moz-placeholder {                /* Mozilla Firefox 4 to 18 */
            color: #ccc;
            font-size:12px;
        }
        input::-moz-placeholder {               /* Mozilla Firefox 19+ */
            color: #ccc;
            font-size:12px;
        }
        input:-ms-input-placeholder {           /* Internet Explorer 10+ */
            color: #ccc;
            font-size:12px;
        }
        .submit-box{
            text-align: center;
            height:50px;
            line-height: 50px;
            padding:5px;
            background-color: #fff;    

        }
        .submit-box .check{
            margin-right:10px;
        }
        .submit-box .submit{
            width:100px;
            height:30px;
            padding:5px;
            background-color: rgb(97,134,213);
            color:#fff;
            text-align: center;
            border-radius: 5px;
            border:1px solid #ddd;
            margin-left:10px;
            font-size:12px;    
        }
        .tip{
            margin-top:5px;
        }
    </style>
</head>
<body>
<div class="container">
    <h3>---账户信息---</h3>
    <form action="" id="form">
        <div class="item">
            <label for=""><span>*</span> 用户名：</label>
            <input type="text" name="username" id="username" placeholder="用户设置成功后不可修改">
            <p class="tip"></p>
        </div>
        <div class="item">
            <label for=""><span>*</span> 登录密码：</label>
            <input type="password" name="pwd" id="pwd" placeholder="6-20位字母，数字或符号">
            <p class="tip"></p>
        </div>
        <div class="item">
            <label for=""><span>*</span> 确认密码：</label>
            <input type="password" name="repwd" id="repwd" placeholder="请再次输入密码">
            <p class="tip"></p>
        </div>
        <div class="item">
            <label for=""><span>*</span> 姓名：</label>
            <input type="text" name="Cname" id="Cname" placeholder="请输入姓名，中文且最多五位">
            <p class="tip"></p>
        </div>
        <div class="item">
            <label for=""><span>*</span> 身份证号：</label>
            <input type="text" name="idNum" id="idNum" placeholder="请输入身份证号">
            <p class="tip"></p>
        </div>
        <div class="item">
            <label for=""><span>*</span> 邮箱：</label>
            <input type="text" name="email" id="email" placeholder="请输入正确邮箱格式">
            <p class="tip"></p>
        </div>
        <div class="item">
            <label for=""><span>*</span> 手机号码：</label>
            <input type="text" name="phone" id="phone" placeholder="请输入您的手机号码">
            <p class="tip"></p>
        </div>
        <div class="submit-box">
            <input type="checkbox" class="check">
            <span>我已阅读并同意遵守规定</span>
            <input type="submit" value="确定提交" class="submit" id="submit">
        </div>
    </form>
</div>

<script src="index.js"></script>
</body>
</html>

index.js

var username=document.getElementById("username");
var pwd=document.getElementById("pwd");
var repwd=document.getElementById("repwd");
var Cname=document.getElementById("Cname");
var idNum=document.getElementById("idNum");
var email=document.getElementById("email");
var phone=document.getElementById("phone");

var submit=document.getElementById("submit");
var form=document.getElementById("form");

var tips=document.querySelectorAll(".tip");
var reg=/正则/;
var test1=false;
var test2=false;
var test3=false;
var test4=false;
var test5=false;
var test6=false;
var test7=false;

//验证用户名，失去焦点时触发
username.onblur=function(){
    var pattern=/^\w{6,18}$/;
    if(this.value==""){//this指代当前输入框
        tips[0].innerHTML="用户名不能为空";
        tips[0].style.color="red";
        test1=false;
    }else{
        if(pattern.exec(this.value)==null){
            tips[0].innerHTML="请输入6-18位数字、字母或下划线";
            tips[0].style.color="red";
            test1=false;
        }else{
            tips[0].innerHTML="格式正确";
            tips[0].style.color="green";
            test1=true;
        }
    }
}

//验证密码，失去焦点时触发
pwd.onblur=function(){
    var pattern=/^\w{6,18}$/;
    if(this.value==""){//this指代当前输入框
        tips[1].innerHTML="密码不能为空";
        tips[1].style.color="red";
        test2=false;
    }else{
        if(pattern.exec(this.value)==null){
            tips[1].innerHTML="请输入6-18位数字、字母或下划线";
            tips[1].style.color="red";
            test2=false;
        }else{
            tips[1].innerHTML="格式正确";
            tips[1].style.color="green";
            test2=true;
        }
    }
}

//确认密码，失去焦点时触发
repwd.onblur=function(){
    if(this.value==""){//this指代当前输入框
        tips[2].innerHTML="确认密码不能为空";
        tips[2].style.color="red";
        test3=false;
    }else{
        if(this.value!=pwd.value){
            tips[2].innerHTML="两次密码不一致";
            tips[2].style.color="red";
            test3=false;
        }else{
            tips[2].innerHTML="格式正确";
            tips[2].style.color="green";
            test3=true;
        }
    }
}

//验证中文名，失去焦点时触发
Cname.onblur=function(){
    var pattern=/^[\u4e00-\u9fa5]{2,5}$/;
    if(this.value==""){//this指代当前输入框
        tips[3].innerHTML="姓名不能为空";
        tips[3].style.color="red";
        test4=false;
    }else{
        if(pattern.exec(this.value)==null){
            tips[3].innerHTML="请输入2-5位中文名";
            tips[3].style.color="red";
            test4=false;
        }else{
            tips[3].innerHTML="格式正确";
            tips[3].style.color="green";
            test4=true;
        }
    }
}

//验证身份证，失去焦点时触发
idNum.onblur=function(){
    var pattern=/^\d{17}[0-9x]$/;
    if(this.value==""){//this指代当前输入框
        tips[4].innerHTML="身份证不能为空";
        tips[4].style.color="red";
        test5=false;
    }else{
        if(pattern.exec(this.value)==null){
            tips[4].innerHTML="身份证格式错误";
            tips[4].style.color="red";
            test5=false;
        }else{
            tips[4].innerHTML="格式正确";
            tips[4].style.color="green";
            test5=true;
        }
    }
}

//验证邮箱，失去焦点时触发
email.onblur=function(){
    //[email protected]
    var pattern=/^\w+@\w+(\.[a-zA-Z_]{2,4})+$/;
    if(this.value==""){//this指代当前输入框
        tips[5].innerHTML="邮箱不能为空";
        tips[5].style.color="red";
        test6=false;
    }else{
        if(pattern.exec(this.value)==null){
            tips[5].innerHTML="邮箱格式错误";
            tips[5].style.color="red";
            test6=false;
        }else{
            tips[5].innerHTML="格式正确";
            tips[5].style.color="green";
            test6=true;
        }
    }
}

//验证手机号，失去焦点时触发
phone.onblur=function(){
    var pattern=/^\d{11}$/;
    if(this.value==""){//this指代当前输入框
        tips[6].innerHTML="手机号不能为空";
        tips[6].style.color="red";
        test7=false;
    }else{
        if(pattern.exec(this.value)==null){
            tips[6].innerHTML="手机号格式错误";
            tips[6].style.color="red";
            test7=false;
        }else{
            tips[6].innerHTML="格式正确";
            tips[6].style.color="green";
            test7=true;
        }
    }
}

//前面所有数据正确时，才能提交
submit.onclick=function(){
    if(test1 && test2 && test3 && test4 && test5 && test6 && test7){
        form.submit();
    }else{
        alert("信息填写有误");
    }
}

效果图

JS常见的表单验证，H5自带的验证和正则表达式的验证

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