Vue遍历data中某个字段，并累加、算总数，总计

遍历data中test，并累加、算总数

let a = [351.8,351.8,351.8,351.8,351.8,351.8,521,421.6,299.1,295.7,670.7,851.7]
console.log(a)
 //定义                   
let sum = 0;
a.forEach((item) => {
     sum = this.numAdd(sum,item) // 数字叠加会出现精度丢失的问题，所以得通过以下方法配合
});
console.log('sum',sum)
// 结果5170.6

// 数字累加
numAdd(num1, num2) {
    var baseNum, baseNum1, baseNum2;
    try {
        baseNum1 = num1.toString().split(".")[1].length;
    } catch (e) {
        baseNum1 = 0;
    }
    try {
        baseNum2 = num2.toString().split(".")[1].length;
    } catch (e) {
        baseNum2 = 0;
    }
    baseNum = Math.pow(10, Math.max(baseNum1, baseNum2));
    return (num1 * baseNum + num2 * baseNum) / baseNum;
}