map解决了我们哪些问题

ES5写法：

var objKey1 = {};

var objKey2 = {};

var dataObj = {};

//objKey键值

dataObj[objKey1]="aa";

dataObj[objKey2]="bb";

//dataObj["object object"]

console.log(dataObj);

console.log(dataObj['[object Object]']);

//结果{ '[object Object]': 'bb' }

ES6写法:

var mapData = new Map();

var objKey1 = {};

var objKey2 ={};

mapData.set(objKey1,"aa");

mapData.set(objKey2,"bb");

console.log(mapData.get(objKey1));

//结果 aa