[数据结构与算法]sort二次排序

js数组sort排序规则

实现一个数组排序函数
对数组[ “A华北”, “A华南”,“B华南”,“A华东”,“B华东”,“A华西”, “C华北”,“A华东” ];
排序为[‘A华东’, ‘A华东’, ‘A华南’, ‘A华西’, ‘A华北’, ‘B华东’, ‘B华南’, ‘C华北’]
排序规则为相同字母A-C开头的A在前面，B、C次之；A相同的情况下按照东南西北排序

function sort(arr) {
        const ABCarr = ["A", "B", "C"];
        const strArr = ["东", "南", "西", "北"];
        const newArr = arr.sort((a, b) => {
          let tmpa = ABCarr.indexOf(a.slice(0, 1));
          let tmpb = ABCarr.indexOf(b.slice(0, 1));
        //   A 、B、C、排序完毕  进行二次条件排序
        if(tmpa===tmpb){
            tmpa = strArr.indexOf(a.slice(2));
            tmpb = strArr.indexOf(b.slice(2));
            return tmpa - tmpb;
        }
        });
        return newArr
      }
	let arr=["A华北", "A华南","B华南","A华东","B华东","A华西", "C华北","A华东" ];
      console.log(sort(arr));