按键值过滤 JSON

发布于02月10日

我有下面的JSON，我想让数组保持相同的格式，但只包括类型为"ar"的对象.我如何用JavaScript过滤这个JSON，使其只包含我需要的类型？

[{"time":"2016-07-26 09:02:27","type":"aa"},
{"time":"2016-04-21 20:35:07","type":"ae"},
{"time":"2016-08-20 03:31:57","type":"ar"},
{"time":"2017-01-19 22:58:06","type":"ae"},
{"time":"2016-08-28 10:19:27","type":"ae"},
{"time":"2016-12-06 10:36:22","type":"ar"},
{"time":"2016-07-09 12:14:03","type":"ar"},
{"time":"2016-10-25 05:05:37","type":"ae"},
{"time":"2016-06-05 07:57:18","type":"ae"},
{"time":"2016-10-08 22:03:03","type":"aa"},
{"time":"2016-08-13 21:27:37","type":"ae"},
{"time":"2016-04-09 07:36:16","type":"ar"},
{"time":"2016-12-30 17:20:08","type":"aa"},
{"time":"2016-03-11 17:31:46","type":"aa"},
{"time":"2016-05-04 14:08:25","type":"ar"},
{"time":"2016-11-29 05:21:02","type":"ar"},
{"time":"2016-03-08 05:46:01","type":"ar"},
]

推荐答案

You should use filter method.

The filter() method creates a new array with all elements that pass the test implemented by the provided function.

Provided function is a callback which is applied to each element of the array.

var arr = [{"time":"2016-07-26 09:02:27","type":"aa"}, {"time":"2016-04-21 20:35:07","type":"ae"}, {"time":"2016-08-20 03:31:57","type":"ar"}, {"time":"2017-01-19 22:58:06","type":"ae"}, {"time":"2016-08-28 10:19:27","type":"ae"}, {"time":"2016-12-06 10:36:22","type":"ar"}, {"time":"2016-07-09 12:14:03","type":"ar"}, {"time":"2016-10-25 05:05:37","type":"ae"}, {"time":"2016-06-05 07:57:18","type":"ae"}, {"time":"2016-10-08 22:03:03","type":"aa"}, {"time":"2016-08-13 21:27:37","type":"ae"}, {"time":"2016-04-09 07:36:16","type":"ar"}, {"time":"2016-12-30 17:20:08","type":"aa"}, {"time":"2016-03-11 17:31:46","type":"aa"}, {"time":"2016-05-04 14:08:25","type":"ar"}, {"time":"2016-11-29 05:21:02","type":"ar"}, {"time":"2016-03-08 05:46:01","type":"ar"}, ];

console.log(arr.filter(function(item){
    return item.type == "ar";         
}));

Also, you can use a shorter way with arrow functions:

var filtered = arr.filter(a => a.type == "ar");

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