<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> <style> *{ box-sizing: border-box; } /*定义背景*/ body{ background: url("../img/register_bg.png") no-repeat center; } .rg_layout{ height: 500px; width: 900px; border: 8px solid #eeeeee; background-color: white; margin: auto; margin-top: 50px; } .rg_left{ /*border: red 1px solid;*/ float: left; margin: 15px; } #p_new{ font-size: 20px; color:#ffd026 ; } #p_user{ font-size: 20px; color:#a6a6a6 ; } .rg_center{ width: 500px; float: left;/*左漂浮*/ padding-top: 10px; } .form_left{ width: 100px; height: 45px; text-align: right;/*右对齐*/ } .form_right{ width: 400px; height: 45px; padding-left: 20px; } #user,#email,#password,#name,#birth,#iphone,#code{ width: 251px; height: 32px; padding-left: 12px; border-radius: 5px;/*圆角*/ } #code{ width: 110px; } #img_check{ height: 32px; padding-left: 10px; vertical-align: middle;/*垂直居中*/ } #btn_sub{ width: 150px; height: 40px; background-color: #ffd026; border: #ffd026; } .rg_right{ /*border: red 1px solid;*/ float: right; } #p_1{ margin: 15px; font-size: 15px; } #p_2{ color:pink ; } .error{ color:silver; font-size: 12px; } #_sub{ padding-left: 100px; } </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 chekUsername(); //调用密码校验方法 chekPassword(); return chekUsername() && chekPassword(); } document.getElementById("user").onblur = chekUsername; document.getElementById("password").onblur = chekPassword; } function chekUsername(){ //1.获取用户名的值 var user = document.getElementById("user").value; //2.定义正则表达式 var reg_user = /^\w{6,12}$/; //3.判断值是否符合正则的规则 var flag = reg_user.test(user); //4.提示信息 var s_username = document.getElementById("s_username"); if(flag){ s_username.innerHTML = "<img width=‘35‘ height=‘25‘ src=‘../img/gou.png‘>" }else{ s_username.innerHTML ="用户名格式错误" } return flag; } function chekPassword(){ //1.获取用户名的值 var password = document.getElementById("password").value; //2.定义正则表达式 var reg_password = /^\w{6,12}$/; //3.判断值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){ s_password.innerHTML = "<img width=‘35‘ height=‘25‘ src=‘../img/gou.png‘>" }else{ s_password.innerHTML ="密码格式错误" } return flag; } </script> </head> <body> <div class="rg_layout"> <div class="rg_left"> <p id="p_new">新用户注册</p> <p id="p_user">USER REGISTER</p> </div> <div class="rg_center"> <div class="rg_form"> <form action="#" method="post" id ="form"> <table cellpadding="0"> <tr> <td class="form_left" width="30%"><label for="user">用户名</label> </td> <td class="form_right"> <input type="text" id="user" placeholder="请输入用户名"> <span id="s_username" class="error"></span> <!--用来表单检验--> </td> </tr> <tr> <td class="form_left" width="30%"><label for="password">密码</label></td> <td class="form_right"> <input type="password" id="password" placeholder="请输入密码"> <span id="s_password" class="error"></span> <!--用来表单检验--> </td> </tr> <tr> <td class="form_left" width="30%"><label for="email">Email</label></td> <td class="form_right"><input type="email" id="email" placeholder="请输入邮箱"></td> </tr> <tr> <td class="form_left" width="30%"><label for="name">姓名</label></td> <td class="form_right"><input type="text" id="name" placeholder="请输入真实姓名"></td> </tr> <tr> <td class="form_left" width="30%"><label for="iphone">手机号</label></td> <td class="form_right"><input type="text" id="iphone" placeholder="请输入手机号"></td> </tr> <tr> <td class="form_left" width="30%">性别</td> <td class="form_right"><input type="radio" name="gender" value="man">男 <input type="radio" name="gender" value="woman">女 </td> </tr> <tr> <td class="form_left" width="30%"><label for="birth">出生日期</label></td> <td class="form_right"><input type="date" id="birth"></td> </tr> <tr> <td class="form_left" width="30%"><label for="code">验证码</label></td> <td class="form_right"><input type="text" id="code"><img id="img_check" src="../img/verify_code.jpg"></td> </tr> <tr> <td colspan="2" align="center" id="_sub"><input id="btn_sub" type="submit" value="注册"></td> </tr> </table> </form> </div> </div> <div class="rg_right"> <p id="p_1">已有账号？<a href="http://baidu.com" target="_blank" id="p_2">立即登录</a></p> </div> </div> </body> </html>
JavaScript 事件练习（表单校验） December 25，2019
原文：https://www.cnblogs.com/yyanghang/p/12099288.html