js 精确计算求和

accAdd(arg1, arg2) {
                var r1 = this.deal(arg1);
                var r2 = this.deal(arg2);
                var m = Math.pow(10, Math.max(r1, r2))
                return (this.accMul(arg1, m) + this.accMul(arg2, m)) / m
            },
            accSub(arg1, arg2) {
                var r1 = this.deal(arg1);
                var r2 = this.deal(arg2);
                var m = Math.pow(10, Math.max(r1, r2))
                return (this.accMul(arg1, m) - this.accMul(arg2, m)) / m
            },
            accMul(arg1, arg2) {
                var m = 0;
                m += this.deal(arg1);
                m += this.deal(arg2);
                var r1 = Number(arg1.toString().replace(".", ""));
                var r2 = Number(arg2.toString().replace(".", ""));
                return (r1 * r2) / Math.pow(10, m)
            },
            deal(arg) {
                var t = 0;
                try {
                    t = arg.toString().split(".")[1].length
                } catch (e) {}
                return t;
            },

changchecked(item, index) {
                let obj = {
                    idExamFeeItem: item.idExamFeeItem
                }
                this.orderInfo.itemInfoList.push(obj)
                item.checked = !item.checked
                if (item.checked) {
                    this.price = this.accAdd(this.price, item.feePrice)
                    console.log(this.orderInfo.itemInfoList)

                } else {
                    //取消选择
                    this.price = this.accSub(this.price, item.feePrice)
                    this.orderInfo.itemInfoList = this.orderInfo.itemInfoList.filter((item) => {
                    return !(JSON.stringify(item)==JSON.stringify(obj))
                          
                    })
                    console.log(this.orderInfo.itemInfoList)
                }


            },