<!DOCTYPE html> <html> <head> <title>模拟加入购物车效果</title> <!-- <link rel="icon" type="image/x-icon" href="jquery_study/images/favicon.ico"> --> <script type="text/javascript" src="jquery-3.3.1.min.js"></script> <style type="text/css"> * {margin: 0px auto;padding: 0px;} .top {width: 402px;height: 35px;line-height: 35px;text-align:center;margin-top: 50px; background: #C40000;color:#fff;} .main {width: 400px;height: 400px;border: 1px solid #C40000;} p {width: 400px;height: 26px;margin-top:10px;} b {width: 90px;height: 26px;line-height: 26px;text-align: center;font-size: 12px;color:#838383; border: 1px solid #ccc;float: left;margin-left: 5px;} span {width: 90px;height: 26px;line-height: 26px;text-align: center;font-size: 12px;color:#838383; border: 1px solid #ccc;display: block;float: left;margin-left: 5px;} span:hover {cursor: pointer;} button {width: 120px;height: 35px;background: #C40000;color: white;border: 0px;} button:hover {cursor: pointer;} .notice{border:0px;} .notice+input{width:60px;margin-left: 6px;text-align: center;} .select{ border:2px solid red; width: 88px;height: 24px; color: red; line-height: 24px; } </style> </head> <body> <div class="top">请选择信息后加入购物车</div> <div class="main"> <p class="item" name="version"> <b class="notice">版本</b> <span>ONE A2001</span> <span>ONE A0001</span> <span>ONE A1001</span> </p> <p class="item" name="color"> <b class="notice">机身颜色</b> <span>白色</span> <span>黑色</span> <span>金色</span> </p> <p class="item" name="type"> <b class="notice">套餐类型</b> <span>标配</span> <span>套餐一</span> <span>套餐二</span> </p> <p class="item" name="ram"> <b class="notice">运行内存</b> <span>2GB</span> <span>3GB</span> <span>4GB</span> </p> <p class="item" name="rom"> <b class="notice">机身内存</b> <span>16GB</span> <span>32GB</span> <span>64GB</span> </p> <p class="item" name="location"> <b class="notice">产地</b> <span>中国大陆</span> <span>港澳台</span> </p> <p class="item" name="price"> <b class="notice">价格</b> <span>999元抢购</span> </p> <p class="item1" name="num"> <b class="notice">数量</b> <input type="number" value="1" > </p> <p style="margin-top:30px;margin-left:95px;"> <button class="bu1" id='sub'>加入购物车</button> </p> </div> <script> //点击span,会有一个边框效果,再点击就消失,并且不能同时在一行中存在两个以上; $(function(){ $('span').click(function(){ //给元素添加一个自定义属性;hasClass() 方法检查被选元素是否包含指定的 class。 if ($(this).hasClass('select')) { //判断当前span中是否有class为select的属性 $(this).removeClass('select') }else{ $(this).addClass('select').siblings('span').removeClass('select') } }) //点击加入购物车 $('#sub').click(function(){ var form={};//空对象用于储存数据; // var flag=true;//判断能否加入购物车; //遍历所有class为item的; $('.item').each(function(){ //判断当前元素下面是否存在select属性的长度不为1(也就是没选中) if ($(this).children('span.select').length !=1) { flag=false; //这里也可以设置为弹窗; // alert('请选择信息') }else{ var key=$(this).attr('name'); var value=$(this).children('span.select').html() form[key]=value; } }) //限制输入数量小于0是,就无法提交; if ($('.item1 input').val()<=0) { // flag=false alert('请选择数量') }else{ form['num']=$('.item1 input').val() console.log() } if (flag) { alert('加入成功') } }) }) </script> </body> </html> <!-- 这里没有用到window.onload,是因为页面没有要输出的文本信息; --> <!-- 而是用读取的$(document).ready(function(){}); -->