SOURCE

add(index){
			this.toolbar=false;
			this.tabBox[index].num+=1;  //当前商品数量
			this.orderNum+=1;           //购物车数量
			this.orderPriceNow[index]=parseFloat((this.tabBox[index].prePrice*this.tabBox[index].num));//当前商品金额=当前单价*当前数量 
			this.orderPrice = parseFloat(this.orderPriceNow.reduce((prev,cur)=>prev+cur)).toFixed(2); 
			console.log("收入："+this.orderPrice)
		}
		minus(index){
			if(this.orderNum<=1){
				this.alertModal=false;
				this.toolbar=true;
			}
			this.orderNum-=1;
			this.tabBox[index].num -= 1;
			this.orderPriceNow[index]=parseFloat((this.tabBox[index].prePrice*this.tabBox[index].num));
			this.orderPrice= parseFloat(this.orderPriceNow.reduce((prev,cur)=>prev-cur)).toFixed(2); 
//			console.log("-"+this.orderPrice)
//			console.log("-"+this.orderPrice)
			console.log("支出："+this.orderPrice)
		}