我不想用switch case,该怎么写js

cyyjm 2020-04-22 02:36:34

我想根据我一个json下的company属性进行统计，但是，我不太想用switch case 或者if来写。这个json是这样的



arr = [

       {'company':'霞山','point':20},

       {'company':'赤坎','point':21},

       {'company':'赤坎','point':22},

       {'company':'赤坎','point':23},

       {'company':'赤坎','point':24},

       {'company':'赤坎','point':25},

       {'company':'赤坎','point':26},

       {'company':'赤坎','point':21},

       {'company':'霞山','point':21},

       {'company':'麻章','point':26},

       {'company':'麻章','point':21},

       {'company':'麻章','point':21},

       {'company':'东海','point':21},

       {'company':'东海','point':21},

       {'company':'东海','point':26},

       {'company':'东海','point':21},

       {'company':'东海','point':21}

      ];

我想得到一个这样的值：



rs = { 

             belongToXs:2,     //霞山在arr里有几个

             belongToCk:7,   //赤坎在arr里有几个

             belongToMz:3,   //麻章在arr里有几个

             belongToPt:0,

             belongToDh:5,    //东海在arr里有几个

             belongToRt:0}

...全文

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cyyjm 2020-04-22

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谢谢。学习了

天际的海浪 2020-04-22

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那就需要用一个对照表


	var arr = [
       {'company':'霞山','point':20},
       {'company':'赤坎','point':21},
       {'company':'赤坎','point':22},
       {'company':'赤坎','point':23},
       {'company':'赤坎','point':24},
       {'company':'赤坎','point':25},
       {'company':'赤坎','point':26},
       {'company':'赤坎','point':21},
       {'company':'霞山','point':21},
       {'company':'麻章','point':26},
       {'company':'麻章','point':21},
       {'company':'麻章','point':21},
       {'company':'东海','point':21},
       {'company':'东海','point':21},
       {'company':'东海','point':26},
       {'company':'东海','point':21},
       {'company':'东海','point':21}
    ];
	var rs = { 
            belongToXs:0,   //霞山在arr里有几个
            belongToCk:0,   //赤坎在arr里有几个
            belongToMz:0,   //麻章在arr里有几个
            belongToPt:0,
            belongToDh:0,   //东海在arr里有几个
            belongToRt:0
    }

	var map = {
        "霞山": "belongToXs",
        "赤坎": "belongToCk",
        "麻章": "belongToMz",
        "东海": "belongToDh"
	};
	arr.forEach(function(v){
		rs[map[v.company]]++;
	});
	console.log(rs);