本文實例為大家分享了js實現購物車計算的具體代碼，供大家參考，具體內容如下

以店鋪為單位，每個店鋪下面有對應的商品選項，可全選，商品單選，店鋪單選，商品數量加減，刪除

代碼：

<script>export default { data() {return { count:0, //所有商品的數量和 shopCarList: [], //所有商品 selectList:[] //已選擇的商品 } }, computed: {//選擇的合計價格selectPrice(){ return this.selectList.reduce((total,item,index)=>{return total+item.quantity*(item.activityPrice || item.price); },0)},//選擇的合計數量selectNum(){ return this.selectList.reduce((total,item,index)=>{return total+item.quantity; },0)},//是否全選isSelecetAll(){ return this.shopCarList.every(item=>{return item.shopSelect===true })} }, methods: {//增加increment(itm){ itm.quantity<itm.stock?itm.quantity++:’’;},//減少decrement(itm){ itm.quantity>1?itm.quantity--:’’},//全選點擊allChooseHandle(){ this.initSelectAll(!this.isSelecetAll);},//商品單選點擊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();},//店鋪單選點擊shopChooseHandle(item,index){ let Flag = !item.shopSelect; this.$set(item,’shopSelect’,Flag); item.products.forEach((itm,idx)=>{this.$set(itm,’productSelect’,Flag); }) this.getSelected();},//獲取已選商品getSelected(){ let tempArr = []; this.shopCarList.forEach((item,index)=>{item.products.forEach((itm,idx)=>{ if(itm.productSelect){tempArr.push(itm); }}) }) this.selectList = tempArr;},//是否全選初始化initSelectAll(Flag){ this.shopCarList.forEach((item,index)=>{this.$set(item,’shopSelect’,Flag);item.products.forEach((itm,idx)=>{ this.$set(itm,’productSelect’,Flag);}) }) this.getSelected();},//獲取購物車列表getCarList(){ return this.$api.personal.getCarList().then(res=>{if(res.result===’000’){ //過期商品數 let expiredNum = 0; res.data.expiredList.forEach(item=>{item.products.forEach(itm=>{ expiredNum += itm.quantity}) }) //有效商品數量 this.count = res.data.count - expiredNum; this.shopCarList = res.data.shopCarList; return Promise.resolve()} })},//刪除點擊delCarList(itm,index,idx){ this.$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>

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持好吧啦網。