vue实现的仿淘宝购物车功能详解

下面是一张众所周知的淘宝购物车页面,今天要讲解的案例就是用vue.js做一个类似的页面

vue实现的仿淘宝购物车功能详解

首先简单介绍一下可能会用到的一些vue.js的用法:

v-bind,绑定属性;例如v-bind:class="{'class1':flag}",这是常用的绑定样式的方法,如果flag为true则class=class1;v-bind:src="image",image就是图像的路径;

v-if="flag"v-show="flag",如果flag为true,则绑定的为“可见”,不同的是v-show是一开始就渲染在DOM中的,改变的则是它的display而已,而v-if为false则是从HTML代码中移除;

v-on:@,样式绑定v-on:click="dosomething()"或者@click="dosomething()",点击触发dosomething函数;

v-for循环,v-for="item in items",items为数组,item为items数组的值而不是索引;

要注意的是当this作用域的改变:当this作用域改变是我们设置var self = this,在之后的使用中用self代替;

下面是HTML代码:

<html> <head> <title>购物车</title> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <link type="text/css" href="https://www.jb51.net/shop.css" > </head> <body> <div> <div><span>商品</span><span>单价</span><span>数量</span><span>总价</span></div> <div v-for="item in goods"> <div v-show="item.selected"> <span v-bind:class="{'checked':item.checked}" @click="check(item)"></span> <div><img v-bind:src="item.image" v-bind:alt="item.alt"/><span>{{item.name}}</span></div> <span>{{item.price}}元</span> <div> <span v-on:click="changeNum(item,-1)"><a href="javascript:void(0)" >-</a></span> <input v-model="item.number" disabled/> <span v-on:click="changeNum(item,1)"><a href="javascript:void(0)" >+</a></span> </div> <div>¥{{item.price * item.number}}元</div> <span @click="seen=true"></span> </div> </div> <!--footer--> <div> <span v-bind:class="{'checked':checkAllFlag}"></span> <a href="javascript:void(0)" @click="checkAll(true)">全选</a> <a href="javascript:void(0)" @click="checkAll(false)">取消全选</a> <span>Total:¥{{totalAll}}元</span> <span><button>结&nbsp;算</button></span> </div> <div v-show="seen"> <p>是否删除该商品?</p><div @click="seen=false">&times</div> <button @click="">yes</button><button @click="seen=false">no</button> </div> <div v-show="seen"></div> </div> </body> <script src="https://www.jb51.net/article/src/vue.min.js"></script> <script src="https://www.jb51.net/article/src/vue-resource.min.js"></script> <script src="https://www.jb51.net/shop.js"></script> </html>

下面的是js的代码:

var vm = new Vue({ el:'#app', data:{ total: 0, totalAll: 0, goods: [],//商品为数组 checkAllFlag: false, seen: false, delFlag: true }, mounted: function () { this.goodlist(); }, methods:{ //改变商品数量 changeNum:function (item,flag) { if (flag>0) { item.number++; }else{ item.number--; if(item.number<1){ item.number = 1; } } this.totalMoney(); }, //是否选中 check:function (item) { if(typeof item.checked == 'undefined'){ this.$set(item,"checked",true); //局部为item添加“checked”,值为true }else{ item.checked = !item.checked; } this.totalMoney(); }, //通过$http.get方法ajax地交互获取商品信息,一定要引入vue-resource组件 goodlist:function () { var self = this; this.$http.get("shop.json").then(function (res) { self.goods = res.data.result.goods; },function () { console.log("failed"); }); }, //是否全选 checkAll:function (flag) { this.checkAllFlag = flag; var self = this; this.goods.forEach(function(value,index){ if(typeof value.checked == 'undefined'){ self.$set(value,"checked",self.checkAllFlag); }else{ value.checked = self.checkAllFlag; } }); this.totalMoney(); }, //结算选中商品的价格 totalMoney:function () { //初始化总价 this.totalAll = 0; var self =this; //通过foreach循环判断是否被选中 this.goods.forEach(function(value,index){ if(value.checked){ self.totalAll += value.price * value.number; } }); } } })

下面是CSS代码:

*{padding: 0;margin: 0;} a{text-decoration: none;color: black;} #app{width: 500px;height: 600px;border: 1px solid;position: absolute;margin-top:20px;margin-left:50px;} .header{width: 500px;height: 30px;line-height: 30px;background-color: darkmagenta;} .header span{display: inline-block;width: 50px;height: 30px;} .show{width: 500px;height: 85px;margin-top: 5px;} #footer{position: absolute;bottom: 0;width: 500px;height: 50px;background-color: #c7c7c9;} .output{width: 40px;height: 20px;} .image{width: 60px;height: 80px;float:left;} .choice{display: inline-block;width: 15px;height: 15px;border-radius: 15px;border: 1px solid;float: left;margin-top: 30px;margin-left: 20px;} .checked{background-color: darkorange;} .icon{background-image: url(del.png);display: inline-block;width: 30px;height: 30px;margin-left: 50px;margin-top: 20px;} .text{display:inline-block;width:50px;height:20px;line-height:20px;font:12px;margin-top:20px;margin-left:5px;float:left;} .count{width:100px;height:40px;background-color:red;line-height:40px;font-size:16px;margin-left:40px;margin-top:5px;} #footer a{display:inline-block;margin-left:5px;height:22px;} #info{width:250px;height:100px;position:absolute;border:1px solid;margin-top:-250px;margin-left:120px;background-color:#c7c7c9;text-align:center;z-index:999;} .get{width:80px;height:30px;font:17px;margin-top:10px;} .shadow{width:100%;height:100%;background-color:black;opacity:0.8;margin-top:-480px;z-index:1;} .close{position:absolute;right:2px;top:-5px;cursor:pointer;}

下面是json代码:

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