可以直接看下效果

代码：

 <script>let list = [{num: 1,price: 10,},{num: 2,price: 10,},{num: 3,price: 10,},{num: 4,price: 10,},]// for循环 求总数和 num的和let num = 0for (let i = 0; i < list.length; i++) {num += list[i].num}console.log('第一种：' + num);// forEach 循环 num的和let number = 0list.forEach(v => {number += v.num});console.log('第二种：' + number);// reduce方法let sumsum = list.reduce((sum, obj) => (sum += obj.num), 0)console.log('第三种：' + sum);</script>// 也可以直接封装一个方法 ，获取总量和总钱数 
<script>// 总价及数量const totalData = function (data) {const priceInfoObj = {};priceInfoObj.totalNumber = data.reduce((totalNumber, obj) => (totalNumber += obj.num),0,);priceInfoObj.priceSum = data.reduce((priceSum, obj) => (priceSum += obj.price * obj.num),0,);return priceInfoObj};console.log(totalData(list))</script>