JS数组里的对象去重

对象中某一重复字段去重

let ar = [
               {code: "a", number: "1"},
               {code: "a", number: "2"},
               {code: "b", number: "1"},
               {code: "a", number: "2"},
               {code: "b", number: "2"},
               {code: "c", number: "1"},
          ]

  1. 去掉code相同并且number不等于2的对象


ar = [
               {code: "a", number: "2"},
               {code: "b", number: "2"},
          ]

2 .保留code不重复的，去掉code相同并且number不等于2的


ar = [
               {code: "a", number: "2"},
               {code: "b", number: "2"},
               {code: "c", number: "1"},
          ]
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