js的判断这里是根据滑块的位置进行判断，应该是用一个flag判断
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%> <% String basePath = request.getContextPath(); %> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>登录</title> <link href="<%=basePath%>/res/css/bootstrap.min14ed.css?v=3.3.6" rel="stylesheet"> <link href="<%=basePath%>/res/css/font-awesome.min93e3.css?v=4.4.0" rel="stylesheet"> <link href="<%=basePath%>/res/css/animate.min.css" rel="stylesheet"> <link href="<%=basePath%>/res/css/style.min862f.css?v=4.1.0" rel="stylesheet"> <!--[if lt IE 9]> <meta http-equiv="refresh" content="0;ie.html" /> <![endif]--> <script> if (window.top !== window.self) { window.top.location = window.location; } </script> <style> * { margin: 0; padding: 0; } body { font: 12px/1.125 Microsoft YaHei; background: #fff; } ul, li { list-style: none; } a { text-decoration: none; } .ani { transition: all .3s; } .wrap { width: 300px; height:; text-align: center; margin: 150px auto; } .inner { padding: 15px; } .clearfix { overflow: hidden; _zoom: 1; } .none { display: none; } #slider { position: relative; background-color: #e8e8e8; width: 300px; height: 34px; line-height: 34px; text-align: center; } #slider .handler { position: absolute; top: 0px; left: 0px; width: 40px; height: 32px; border: 1px solid #ccc; cursor: move; } .handler_bg { background: #fff url("data:image/png;base64,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") no-repeat center; } .handler_ok_bg { background: #fff url("data:image/png;base64,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") no-repeat center; } #slider .drag_bg { background-color: #7ac23c; height: 34px; width: 0px; } #slider .drag_text { position: absolute; top: 0px; width: 300px; -moz-user-select: none; -webkit-user-select: none; user-select: none; -o-user-select: none; -ms-user-select: none; } .unselect { -moz-user-select: none; -webkit-user-select: none; -ms-user-select: none; } .slide_ok { color: #fff; } </style> </head> <style> .btn-primary { background-color: #0000FF; } .btn-primary:hover { background-color: #0000FF; } .btn-primary { background-color: #0000FF; border-color: #0000FF; } </style> <body class="gray-bg"> <div class="middle-box text-center loginscreen animated fadeInDown"> <div> <h3 style="margin-top: 100px;">欢迎登录</h3> <form class="m-t" role="form" action="<%=basePath%>/login" method="POST" onsubmit="return login();"> <div class="form-group"> <input name="username" id="username" type="text" class="form-control" placeholder="用户名" required=""> </div> <div class="form-group"> <input type="password" name="password" id="password" class="form-control" placeholder="密码" required=""> </div> <div class="wrap" style="margin: 10px auto 10px"> <div id="slider"> <div class="drag_bg"></div> <div class="drag_text" onselectstart="return false;" unselectable="on">拖动滑块验证</div> <div class="handler handler_bg"></div> </div> </div> <input type="hidden" name="${_csrf.parameterName}" value="${_csrf.token}"> <button type="submit" style="background-color: #0000FF;" class="btn btn-primary block full-width m-b">登 录</button> <% if (request.getParameter("error") != null) { %> <span id="" style="color: red;">账号或者密码错误！</span> <% } %> <% if (request.getParameter("logout") != null) { %> <span>已经安全退出！</span> <% } %> <p class="text-muted text-center"> <a href="login.html#"><small>忘记密码了？</small></a> | <a href="<%=basePath%>/register">注册一个新账号</a> </p> </form> </div> </div> <script src="<%=basePath%>/res/js/jquery.min.js?v=2.1.4"></script> <script src="<%=basePath%>/res/js/bootstrap.min.js?v=3.3.6"></script> </body> <script type="text/javascript" src="<%=basePath%>/res/js/jquery-1.12.4.min.js"></script> <script type="text/javascript" src="<%=basePath%>/res/js/jquery.md5.js"></script> <script type="text/javascript"> $(function() { $('#username').val(); }); function login() { if($(".drag_bg").width()<260){ return false; } var password = $('#password').val(); password = $.md5(password); console.log(password); $('#password').val(password); return true; } </script> <script> (function(window, document, undefined) { var dog = {//声明一个命名空间，或者称为对象 $ : function(id) { return document.querySelector(id); }, on : function(el, type, handler) { el.addEventListener(type, handler, false); }, off : function(el, type, handler) { el.removeEventListener(type, handler, false); } }; //封装一个滑块类 function Slider() { var args = arguments[0]; for ( var i in args) { this[i] = args[i]; //一种快捷的初始化配置 } //直接进行函数初始化，表示生成实例对象就会执行初始化 this.init(); } Slider.prototype = { constructor : Slider, init : function() { this.getDom(); this.dragBar(this.handler); }, getDom : function() { this.slider = dog.$('#' + this.id); this.handler = dog.$('.handler'); this.bg = dog.$('.drag_bg'); }, dragBar : function(handler) { var that = this, startX = 0, lastX = 0, doc = document, width = this.slider.offsetWidth, max = width - handler.offsetWidth, drag = { down : function(e) { var e = e || window.event; that.slider.classList.add('unselect'); startX = e.clientX - handler.offsetLeft; console.log('startX: ' + startX + ' px'); dog.on(doc, 'mousemove', drag.move); dog.on(doc, 'mouseup', drag.up); return false; }, move : function(e) { var e = e || window.event; lastX = e.clientX - startX; lastX = Math.max(0, Math.min(max, lastX)); //这一步表示距离大于0小于max，巧妙写法 console.log('lastX: ' + lastX + ' px'); if (lastX >= max) { handler.classList.add('handler_ok_bg'); that.slider.classList.add('slide_ok'); dog.off(handler, 'mousedown', drag.down); drag.up(); } that.bg.style.width = lastX + 'px'; handler.style.left = lastX + 'px'; }, up : function(e) { var e = e || window.event; that.slider.classList.remove('unselect'); if (lastX < width) { that.bg.classList.add('ani'); handler.classList.add('ani'); that.bg.style.width = 0; handler.style.left = 0; setTimeout(function() { that.bg.classList.remove('ani'); handler.classList.remove('ani'); }, 300); } dog.off(doc, 'mousemove', drag.move); dog.off(doc, 'mouseup', drag.up); } }; dog.on(handler, 'mousedown', drag.down); } }; window.S = window.Slider = Slider; })(window, document); var defaults = { id : 'slider' }; new S(defaults); </script> </html>