js怎样通过arr3把arr2变成arr4

Question

var arr2 = [{1: '1'}, {2: '2'}, {3: '3'}, {5: '5'}];var arr3 = [{1: '1'}, {2: '2'}, {3: '3'}, {4: '4'}, {5: '5'}, {6: '6'}];var arr4 = [{1: '1'}, {2: '2'}, {3: '3'}, {4: '0'}, {5: '5'}, {6: '0'}];

Answer 1

var arr2 = [{1: '1'}, {2: '2'}, {3: '3'}, {5: '5'}];

var arr3 = [{1: '1'}, {2: '2'}, {3: '3'}, {4: '4'}, {5: '5'}, {6: '6'}];

var arr4 = [];

var obj = {};

for (var i=0; i<arr2.length; i++) {

    var temp = arr2[i];

    for (var key in temp) {

        obj[key] = temp[key];

    }

}

for (var j=0; j<arr3.length; j++) {

    var temp = arr3[j];

    for (var key in temp) {

        if (obj[key]) {

            var subobj = {};

            subobj[key] = obj[key];

            arr4.push(subobj)

        } else {

            var subobj = {};

            subobj[key] = '0';

            arr4.push(subobj)

        }

    }

}