本文实例为大家分享了js表单验证的实现方法，供大家参考，具体内容如下
第一种：js表单验证
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>注册-个人用户</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <script src="//www.vevb.com/uploads/allimg/190905/114IU118-0.jpg"></script> <style> body { font-family: Arial, "宋体", Lucida, Verdana, Helvetica, sans-serif; font-size: 12px; color: #333; line-height: 150%; background: #f2f2f2; } .hide{display:none;} .focus,.error { color: #e4393c; line-height: 36px; height: 36px; position: absolute; top: 0px; width: 260px; padding: 0 5px; background: #FFEBEB; border: 1px solid #ffbdbe; } .error span,.focus span { padding: 5px 0; line-height: 13px; display: block; } .focus { color: #666; width: 260px;; line-height: 36px; background: #f7f7f7; border: 1px solid #dddddd; } .regist { width: 990px; padding: 0; margin: 0 auto; zoom: 1; } .mc { padding: 30px 0 20px; border: solid #dddddd; border-width : 0px 1px 1px; background: #FFF; overflow: hidden; zoom: 1; border-width: 0px 1px 1px; } .form { float: left; width: 750px; font-size: 12px; } .form label,.form input,.form select,.form textarea,.form button,.form .label { float: left; font-size: 12px; } .item { padding-top: 9px; height: 60px; line-height: 34px; position: relative; z-index: 1; } .label { float: left; width: 190px; text-align: right; font-size: 14px; color: #999; padding-right: 10px; } .input { float: left; position: relative; width: 270px; overflow: visible; } .text { float: none; width: 275px; height: 37px; line-height: 32px; border: 1px solid #cccccc; font-size: 14px; font-family: arial, "宋体"; overflow: hidden; } </style></head><body> <div class="regist"> <div class="mc"> <form id="personRegForm" class="form" action="login.html" method="POST" onsubmit="return validateForm();"> <div class="item"> <span class="label">用户名：</span> <div class="input"> <input type="text" id="username" name="username" class="text"> <label id="username_msg" class="hide"></label> </div> </div> <div class="item"> <span class="label">请设置密码：</span> <div class="input"> <input type="password" id="password" name="password" class="text"> <label id="pwd_msg" class="hide"></label> </div> </div> <div class="item"> <span class="label">请确认密码：</span> <div class="input"> <input type="password" id="pwdRepeat" name="pwdRepeat" class="text"> <label id="pwdRepeat_msg" class="hide"></label> </div> </div> <div class="item"> <span class="label">验证邮箱：</span> <div class="input"> <input type="text" id="mail" name="mail" class="text"> <label id="mail_msg" class="hide"></label> </div> </div> <div class="item"> <span class="label"> </span> <input type="submit" class="btn-img" id="registsubmit" value="立即注册" /> </div> </form> </div> </div> <script> window.onload = function(){ // 1. 用户名 $("#username").focus(function(){ /* 获取焦点 var username_msg = $("#username_msg"); username_msg.text("4-20位字符，支持英文、数字及'-'、'_'组合"); username_msg.attr("class","focus"); */ elemFocus("username_msg","4-20位字符，支持英文、数字及'-'、'_'组合"); }).blur(userValidator); // 2. 密码 $("#password").focus(function(){ elemFocus("pwd_msg","6-20位字符，可使用字母、数字的组合"); }).blur(pwdValidator); // 3. 确认密码 $("#pwdRepeat").focus(function(){ elemFocus("pwdRepeat_msg","6-20位字符，可使用字母、数字的组合"); }).blur(pwdRepeatValidator); // 4. Email $("#mail").focus(function(){ elemFocus("mail_msg","完成验证后，可以使用该邮箱登录和找回密码"); }).blur(emailValidator); } // 定义函数 - 通用的信息提示 function elemFocus(eleId,text){ var ele_msg = $("#"+eleId); ele_msg.text(text); ele_msg.attr("class","focus"); } // 定义验证用户名的函数 function userValidator(){ // 获取用户名输入的值 var value = $("#username").val(); // 获取用于显示提示信息的元素 var username_msg = $("#username_msg"); // 验证逻辑 if(value==""||value==null){ username_msg.text("用户名不能为空"); username_msg.attr("class","error"); return false; }else if(value.length<4||value.length>20){ username_msg.text("用户名的长度不正确"); username_msg.attr("class","error"); return false; }else if(!/^[a-zA-Z0-9-_]{4,20}$/.test(value)){ username_msg.text("用户名输入不正确"); username_msg.attr("class","error"); return false; } // 验证通过修改正确样式 if(!username_msg.hasClass("hide")){ username_msg.text(""); username_msg.attr("class","hide"); } return true; } // 定义验证密码的函数 function pwdValidator(){ var value = $("#password").val(); var pwd_msg = $("#pwd_msg"); if(value==""||value==null){ pwd_msg.text("密码不能为空"); pwd_msg.attr("class","error"); return false; }else if(value.length<6||value.length>20){ pwd_msg.text("密码的长度不正确"); pwd_msg.attr("class","error"); return false; }else if(!/^[a-zA-Z0-9]{6,20}$/.test(value)){ pwd_msg.text("密码输入不正确"); pwd_msg.attr("class","error"); return false; } if(!pwd_msg.hasClass("hide")){ pwd_msg.text(""); pwd_msg.attr("class","hide"); } return true; } // 定义确认密码验证的函数 function pwdRepeatValidator(){ var value = $("#pwdRepeat").val(); var pwdRepeat_msg = $("#pwdRepeat_msg"); var pwd = $("#password").val(); if(value==""||value==null){ pwdRepeat_msg.text("密码不能为空"); pwdRepeat_msg.attr("class","error"); return false; }else if(value.length<6||value.length>20){ pwdRepeat_msg.text("密码的长度不正确"); pwdRepeat_msg.attr("class","error"); return false; }else if(!/^[a-zA-Z0-9]{6,20}$/.test(value)){ pwdRepeat_msg.text("密码输入不正确"); pwdRepeat_msg.attr("class","error"); return false; }else if(value != pwd){ pwdRepeat_msg.text("两次密码输入不一致"); pwdRepeat_msg.attr("class","error"); return false; } if(!pwdRepeat_msg.hasClass("hide")){ pwdRepeat_msg.text(""); pwdRepeat_msg.attr("class","hide"); } return true; } // 定义Email验证的函数 function emailValidator(){ var value = $("#mail").val(); var email_msg = $("#mail_msg"); if(value==""||value==null){ email_msg.text("Email不能为空"); email_msg.attr("class","error"); return false; }else if(!/^/w+([-+.]/w+)*@/w+([-.]/w+)*/./w+([-.]/w+)*$/.test(value)){ email_msg.text("Email格式不正确"); email_msg.attr("class","error"); return false; } if(!email_msg.hasClass("hide")){ email_msg.text(""); email_msg.attr("class","hide"); } return true; } function validateForm(){ if(!userValidator()||!pwdValidator()||!pwdRepeatValidator()||!emailValidator()){ return false; } return true; } </script></body></html>
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