分析：
给表单绑定submit事件。监听器中判断每一个方法校验的结果
如果都为true，则监听器返回true
如果一个为false，则监听器返回都为false
定义一些方法分别校验各个单项
给各个表单绑定哦你blue事件
<!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: 900px; height: 500px; border: 8px solid #EEEEEE; background-color: white; /*让div水平居中*/ margin: auto; } .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 { float: left; /* border: 1px solid red;*/ } .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_left { 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; } #checkcode { width: 110px; } #img_check { height: 32px; vertical-align: middle; } #btn_sub { width: 150px; height: 40px; background-color: #FFD026; border: 1px solid #FFD026; } #td_sub{ padding-left: 150px; } .error{ color:red; vertical-align: middle; } </style> <script> window.onload = function(){ document.getElementById("form").onsubmit = function(){ return checkUsername() && checkPassword(); } document.getElementById("username").onblur = checkUsername; document.getElementById("password").onblur = checkPassword; } function checkUsername(){ var username = document.getElementById("username").value; var reg_username = /^\w{6,12}$/; var flag = reg_username.test(username); var s_username = document.getElementById("s_username"); if(flag){ s_username.innerHTML = "<img height='25' width='35' src='img/gou.png'>" }else{ s_username.innerHTML = "用户名格式有误"; } return flag; } function checkPassword(){ var password = document.getElementById("password").value; var reg_password = /^\w{6,12}$/; var flag = reg_password.test(password); var s_password = document.getElementById("s_password"); if(flag){ s_password.innerHTML = "<img height='25' width='35' src='img/gou.png'>" }else{ s_password.innerHTML = "密码格式有误"; } return flag; } </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"> <!--定义表单 form--> <form action="#" id="form" method="get"> <table> <tr> <td class="td_left"><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_left"><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_left"><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_left"><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_left"><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_left"><label>性别</label></td> <td class="td_right"> <input type="radio" name="gender" value="male"> 男 <input type="radio" name="gender" value="female"> 女 </td> </tr> <tr> <td class="td_left"><label for="birthday">出生日期</label></td> <td class="td_right"><input type="date" name="birthday" id="birthday" placeholder="请输入出生日期"> </td> </tr> <tr> <td class="td_left"><label for="checkcode">验证码</label></td> <td class="td_right"><input type="text" name="checkcode" 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" id="btn_sub" value="注册"></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>
BootStrap概述
概念：
一个前端开发的框架，Bootstrap，来自Twitter，是目前很受欢迎的前端框架。Bootstrap是基于HTNL、CSS、JavaScript 的，它简洁灵活，使得web开发更加快捷。
框架:一个半成品软件，开发人员可以在框架基础上，在进行开发，简化编码。
好处:
1定义了很多的css样式和js插件。我们开发人员面接可以使用这些样式和插件得到丰富的页面效果。
2响应式布局。
同一套耍面可以兼容不同分辨率的设备。
