代码：

function orderStudentGrade(students) {// TODO: 在这里写入具体的实现逻辑// 将学生的成绩按班级分组，同一班级中按照总分从高到底排序if(students.length == 0) {return {}}// 排序函数，按照总分降序const compare = (a, b) => {const scoreA = a.math + a.language + a.english + a.physics + a.chemistryconst scoreB = b.math + b.language + b.english + b.physics + b.chemistryreturn scoreB - scoreA}let result = {}let arr1 = students.filter(item => item.class == 1).sort(compare)  //留下班级为1的数组let arr2 = students.filter(item => item.class == 2).sort(compare)let arr3 = students.filter(item => item.class == 3).sort(compare)result = { 1:arr1, 2:arr2, 3:arr3}return result}module.exports = orderStudentGrade; // 检测需要，请勿删除

考点：

1.数组排序：

arr.sort(compareFn)

基础升序函数

(a,b) => return a-b

按数组内对象内某个属性排序

function compare(a, b) {return (a.math + a.english) - (b.math + b.english)}

 2.过滤器：

常用于筛选数组

let arr = arr.filter(function(currentValue, index, arr) {return //满足条件直接return，用新数组接收})