JavaScript 去掉对象数组中key值相同的对象

Question

题目描述去掉对象数组中key值相同的对象题目来源及自己的思路相关代码let arr = [   {"weight":10,"id":1},   {"weight":20,"id":2},   {"weight":30,"id":2},   {"weight":40,"id":4},   {"weight":50,"id":5} ];你期待的结果是什么？实际看到的错误信息又是什么？let arr = [   {"weight":10,"id":1},   {"weight":30,"id":2},   {"weight":40,"id":4},   {"weight":50,"id":5} ];