js实现购物车计算的方法

本文实例为大家分享了js实现购物车计算的具体代码，供大家参考，具体内容如下

以店铺为单位，每个店铺下面有对应的商品选项，可全选，商品单选，店铺单选，商品数量加减，删除

代码：

<script>export default { data() {return { count:0, //所有商品的数量和 shopCarList: [], //所有商品 selectList:[] //已选择的商品 } }, computed: {//选择的合计价格selectPrice(){ return this.selectList.reduce((total,item,index)=>{return total+item.quantity*(item.activityPrice || item.price); },0)},//选择的合计数量selectNum(){ return this.selectList.reduce((total,item,index)=>{return total+item.quantity; },0)},//是否全选isSelecetAll(){ return this.shopCarList.every(item=>{return item.shopSelect===true })} }, methods: {//增加increment(itm){ itm.quantity<itm.stock?itm.quantity++:’’;},//减少decrement(itm){ itm.quantity>1?itm.quantity--:’’},//全选点击allChooseHandle(){ this.initSelectAll(!this.isSelecetAll);},//商品单选点击productChooseHandle(itm,index){ let productFlag = !itm.productSelect; this.$set(itm,’productSelect’,productFlag); let shopFlag = this.shopCarList[index].products.every(i=>{return i.productSelect===true; }) this.$set(this.shopCarList[index],’shopSelect’,shopFlag); this.getSelected();},//店铺单选点击shopChooseHandle(item,index){ let Flag = !item.shopSelect; this.$set(item,’shopSelect’,Flag); item.products.forEach((itm,idx)=>{this.$set(itm,’productSelect’,Flag); }) this.getSelected();},//获取已选商品getSelected(){ let tempArr = []; this.shopCarList.forEach((item,index)=>{item.products.forEach((itm,idx)=>{ if(itm.productSelect){tempArr.push(itm); }}) }) this.selectList = tempArr;},//是否全选初始化initSelectAll(Flag){ this.shopCarList.forEach((item,index)=>{this.$set(item,’shopSelect’,Flag);item.products.forEach((itm,idx)=>{ this.$set(itm,’productSelect’,Flag);}) }) this.getSelected();},//获取购物车列表getCarList(){ return this.$api.personal.getCarList().then(res=>{if(res.result===’000’){ //过期商品数 let expiredNum = 0; res.data.expiredList.forEach(item=>{item.products.forEach(itm=>{ expiredNum += itm.quantity}) }) //有效商品数量 this.count = res.data.count - expiredNum; this.shopCarList = res.data.shopCarList; return Promise.resolve()} })},//删除点击delCarList(itm,index,idx){ this.$api.personal.delCarList( [itm.carId] ).then(res=>{if(res.result===’000’){ this.count -= itm.quantity; this.shopCarList[index].products.splice(idx,1); if(this.shopCarList[index].products.length===0){this.shopCarList.splice(index,1); } this.getSelected();} })}, }, created() {this.getCarList().then(()=>{ this.initSelectAll(true);}); },};</script>

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