案例:注册表单校验用户名或密码输入正确错误的回显

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>注册页面</title>
    <style>
        *{
            margin: 0px;
            padding: 0px;
            box-sizing: border-box;
        }
        body{
            background: url("img/register_bg.png") no-repeat center;
            padding-top: 25px;
        }
        .rg_layout{
            width: 950px;
            height: 500px;
            border: 8px solid #EEEEEE;
            background-color: white;
            /*div水平居中*/
            margin: auto;
            margin-top: 15px;
        }
        .rg_left{
            /*border: 1px solid red;*/
            float: left;
            margin: 15px;
        }
        .rg_left > p:first-child{
            color: #FFD026;
            font-size: 20px;
        }
        .rg_left > p:last-child{
            color: #A6A6A6;
            font-size: 20px;
        }
        .rg_center{
            /*border: 1px solid red;*/
            float: left;
            width: 550px;
        }
        .rg_right{
            /*border: 1px solid red;*/
            float: right;
            margin: 15px;
        }
        .rg_right > p:first-child{
            font-size: 15px;
        }
        .rg_right p a {
            color: pink;
        }
        .td_legt{
            width: 100px;
            text-align: right;
            height: 45px;
        }
        .td_right{
            padding-left: 50px;
        }
        #username,#password,#email,#name,#tel,#birthday,#checkcode{
            width: 251px;
            height: 32px;
            border: 1px solid #A6A6A6;
            /*设置边框圆角*/
            border-radius: 5px;
            padding-left: 10px;
            padding-right: 10px;
        }
        #checkcode{
            width: 100px;
        }

        #img_check{
            height: 32px;
            vertical-align: middle;
        }
        #btn_sub{
            width: 150px;
            height: 40px;
            background-color: #FFD026;
            border: 1px solid #FFD026;
        }
        .error{
            color:red;
        }
        #td_sub{
          padding-left: 150px;
        }
    </style>
    <script>
        /*
                分析:
                    1.给表单绑定onsubmit事件。监听器中判断每一个方法校验的结果。
                        如果都为true,则监听器方法返回true
                        如果有一个为false,则监听器方法返回false

                    2.定义一些方法分别校验各个表单项。
                    3.给各个表单项绑定onblur事件。
             */
        window.onload = function() {
            //1.给表单绑定onsubmit事件
            document.getElementById("form").onsubmit = function() {
                //调用用户校验方法   checkUsername();
                //调用密码校验方法   checkPassword();
                return checkUsername() && checkpassword();
            }
            //给用户名和密码框分别绑定离开焦点事件
            document.getElementById("username").onblur = checkUsername;
            document.getElementById("password").onblur = checkpassword;
        }
        function checkUsername() {
            //1.获取用户名的值
            var username = document.getElementById("username").value;
            //2.定义正则表达式
            var reg_username = /^\w{6,12}$/;
            //3.判断是否符合正则的规则
            var flag = reg_username.test(username);
            //4.提示信息
            var s_username = document.getElementById("s_username");
            if(flag) {
                //提示绿色对勾
                s_username.innerHTML = ""
            } else {
                //提示红色用户名有误
                s_username.innerHTML = "用户名格式有误";
            }
            return flag;
        }
        function checkpassword() {
            //1.获取密码的值
            var password = document.getElementById("password").value;
            //2.定义正则表达式
            var reg_password = /^\w{6,12}$/;
            //3.判断是否符合正则的规则
            var flag = reg_password.test(password);
            //4.提示信息
            var s_password = document.getElementById("s_password");
            if(flag) {
                //提示绿色对勾
                s_password.innerHTML = ""
            }else{
                //提示红色密码有误
                s_password.innerHTML = "密码格式有误";
            }
        }
    </script>
</head>
<body>
    <div class="rg_layout">
        <div class="rg_left">
            <p>新用户注册</p>
            <p>USER REGISTER</p>
        </div>
        <div class="rg_center">
            <div class="rg_form">
                <form action="#" id="form" method="post">
                    <table>
                        <tr>
                            <td class="td_legt"><label for="username">用户名</label></td>
                            <td class="td_right">
                                <input type="text" name="username" id="username" placeholder="请输入用户名">
                                <span id="s_username" class="error"></span>
                            </td>

                        </tr>
                        <tr>
                            <td class="td_legt"><label for="password">密码</label></td>
                            <td class="td_right">
                                <input type="password" name="password" id="password" placeholder="请输入密码">
                                <span id="s_password" class="error"></span>
                            </td>

                        </tr>
                        <tr>
                            <td class="td_legt"><label for="email">email</label></td>
                            <td class="td_right"><input type="email" name="email" id="email"placeholder="请输入邮箱"></td>
                        </tr>
                        <tr>
                            <td class="td_legt"><label for="name">姓名</label></td>
                            <td class="td_right"><input type="text" name="name" id="name"placeholder="请输入姓名"></td>
                        </tr>
                        <tr>
                            <td class="td_legt"><label for="tel">手机号</label></td>
                            <td class="td_right"><input type="text" name="tel" id="tel"placeholder="请输入手机号"></td>
                        </tr>
                        <tr>
                            <td class="td_legt"><label>性别</label></td>
                            <td class="td_right"><input type="radio" name="gender" value="male" checked><input type="radio" name="gender" value="female"></td>
                        </tr>
                        <tr>
                            <td class="td_legt"><label for="birthday">出生日期</label></td>
                            <td class="td_right"><input type="date" name="name" id="birthday"placeholder="请输入出生日期"></td>
                        </tr>
                        <tr>
                            <td class="td_legt"><label for="checkcode">验证码</label></td>
                            <td class="td_right"><input type="text" name="name" id="checkcode"placeholder="请输入验证码"><img id="img_check" src="img/verify_code.jpg"></td>
                        </tr>
                        <tr>
                            <td colspan="2" id="td_sub"><input type="submit" value="注册" id="btn_sub"></td>
                        </tr>
                    </table>
                </form>
            </div>
        </div>
        <div class="rg_right">
            <p>已有账号?<a href="#">立即登录</a></p>
        </div>
    </div>
</body>
</html>

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