JavaScript 之表单验证

本文链接： https://blog.csdn.net/Mr_wxc/article/details/93792870
JavaScript 可用来在数据被送往服务器前对 HTML 表单中的这些输入数据进行验证。
表单数据经常需要使用 JavaScript 来验证其正确性。
表单验证包括对用户名、密码、密码强度、QQ号、手机号以及邮箱等的验证
话不多说直接上代码，下面有效果图
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
</head>
<style type="text/css">
    body {
        background: #ccc;
    }

    label {
        width: 40px;
        display: inline-block;
    }

    .container {
        margin: 100px auto;
        width: 400px;
        padding: 50px;
        line-height: 40px;
        border: 1px solid #999;
        background: #efefef;
    }

    span {
        margin-left: 30px;
        font-size: 12px;
        padding:2px 20px 0;
        color: #ccc;
    }

    .wrong {
        color: red;
        background: url(images/error.png) no-repeat;
        
    }

    .right {
        color: green;
        background: url(images/right.png) no-repeat;
    }

    .pwd {
        width: 220px;
        height: 20px;
        background: url("images/strong.jpg") no-repeat;
    }
    .str1{
        background-position: 0 -20px;/*密码强度弱*/
    }
    .str2{
        background-position: 0 -40px;/*密码强度一般*/
    }
    .str3{
        background-position: 0 -60px;/*密码强度很好*/
    }
    .str4{
        background-position: 0 -80px;/*密码强度极佳*/
    }
</style>

<script>
    window.onload = function () {
        
        var password = document.getElementById("password");

        //qq号
        addEvent("inp1", function () {
            if(/^[1-9][0-9]{4,}$/.test(this.value)){//满足正则表达式
                setClassName(this,"right");
                setInnerHTML(this,"恭喜您,输入正确！");
            }else{ //不满足正则表达式
                setClassName(this,"wrong");
                setInnerHTML(this,"格式错误！");
            }
        });

        //手机号
        addEvent("inp2", function () {
            if(/^((13[0-9])|(15[^4,\D])|(18[0-9]))\d{8}$/.test(this.value)){
                setClassName(this,"right");
                setInnerHTML(this,"恭喜您,输入正确！");
            }else{
                setClassName(this,"wrong");
                setInnerHTML(this,"格式错误！");
            }
        });

        //邮箱
        addEvent("inp3", function () {
            if(/^[\w\-\.]{5,}\@[\w]+\.[\w]{2,4}$/.test(this.value)){
                setClassName(this,"right");
                setInnerHTML(this,"恭喜您,输入正确！");
            }else{
                setClassName(this,"wrong");
                setInnerHTML(this,"格式错误！");
            }
        });


        //座机
        addEvent("inp4", function () {
            if(/^[1-9][0-9]{4,}$/.test(this.value)){
                setClassName(this,"right");
                setInnerHTML(this,"恭喜您,输入正确！");
            }else{
                setClassName(this,"wrong");
                setInnerHTML(this,"格式错误！");
            }
        });


        //用户名
        addEvent("inp5", function () {
            if(/^[a-zA-Z0-9_-]{3,16}$/.test(this.value)){
                setClassName(this,"right");
                setInnerHTML(this,"恭喜您,输入正确！");
            }else{
                setClassName(this,"wrong");
                setInnerHTML(this,"格式错误！");
            }
        });


        //密码
        addEvent("inp6", function () {
            if(/^[a-zA-Z0-9_\-$]{6,18}$/.test(this.value)){
                setClassName(this,"right");
                setInnerHTML(this,"恭喜您,输入正确！");
                password.className = "pwd str1";
                
                if(/^[A-Za-z0-9]+[_$][A-Za-z0-9]*$/.test(this.value)){
                    password.className = "pwd str4";
                }else if(/^([a-z].*[0-9])|([A-Z].*[0-9])|[0-9].*[a-zA-Z]$/.test(this.value)){
                    password.className = "pwd str3";
                }else if(/^([a-z].*[A-Z])|([A-Z].*[a-z])$/.test(this.value)){
                    password.className = "pwd str2";
                }

            }else{
                setClassName(this,"wrong");
                setInnerHTML(this,"格式错误！");
            }
        });


        //因为每次都要这样调用，所以很繁琐，我们通过封装实现代码
        function addEvent(str,fn){
            document.getElementById(str).onblur = fn;
        }

        function setClassName(aaa,txt){
            var span = aaa.nextElementSibling || this.nextSibling;
            span.className = txt;
        }

        function setInnerHTML(aaa,txt){
            var span = aaa.nextElementSibling || this.nextSibling;
            span.innerHTML = txt;
        }
    }
</script>

<body>
    <div class="container">
        <!--点击文字跳转到文本框-->
        <label for="inp1">QQ</label><input type="text" id="inp1"><span>输入正确的QQ号码</span><br>
        <label for="inp2">手机</label><input type="text" id="inp2"><span>输入13位手机号码</span><br>
        <label for="inp3">邮箱</label><input type="text" id="inp3"><span>输入正确邮箱</span><br>
        <label for="inp4">座机</label><input type="text" id="inp4"><span>输入您的座机</span><br>
        <label for="inp5">账号</label><input type="text" id="inp5"><span>亲输入您的账号</span><br>
        <label for="inp6">密码</label><input type="text" id="inp6"><span>请输入您的密码</span><br>
        <div id="password" class="pwd"></div>
    </div>
</body>
</html>
效果图如下：
如果你有不同的需求，可以根据自己的需求对代码进行相应的修改
JavaScript 之表单验证

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