一个简单的数组对象筛选题

/**

* 请用您认为最优化的方式，将arr中的type为4的数据过滤出来，

* 然后按相同的 name + date（按天）合并value（value累加），

* 然后按 value 降序(从大到小)排序，

* 最后每行按照 "${name},${本地日期},售出${sum(value)}部" 的格式，如："小米2,2017年06月08日,售出5部", 打印(console.log)出来。

 

<script>
    var arr = [
        {name: '小米1', value: 1, type: 2, date: '2018-06-07T08:00:01.589Z'},
        {name: '锤子T1', value: 1, type: 2, date: '2018-06-07T08:10:01.589Z'},
        {name: '小米2', value: 1, type: 4, date: '2018-06-07T20:00:01.589Z'},
        {name: '小米2', value: 4, type: 4, date: '2018-06-07T20:10:21.189Z'},
        {name: '小米4', value: 1, type: 4, date: '2018-06-07T08:00:01.560Z'},
        {name: '小米4', value: 2, type: 4, date: '2018-06-07T08:10:31.584Z'},
        {name: '小米6', value: 1, type: 3, date: '2018-06-07T08:00:01.589Z'},
        {name: '小米5s', value: 1, type: 4, date: '2018-06-07T08:00:01.589Z'},
        {name: '锤子T2', value: 1, type: 4, date: '2018-06-07T08:00:01.589Z'},
        {name: '锤子T1', value: 4, type: 4, date: '2018-06-07T08:06:01.589Z'},
        {name: '魅蓝note5', value: 1, type: 4, date: '2018-06-07T08:00:01.589Z'},
        {name: '魅蓝note2', value: 5, type: 4, date: '2018-06-02T08:07:01.589Z'},
        {name: '魅蓝note2', value: 6, type: 4, date: '2018-06-07T08:00:01.589Z'},
        {name: '魅蓝note3', value: 1, type: 4, date: '2018-06-05T08:00:01.589Z'},
        {name: '魅蓝note', value: 1, type: 4, date: '2018-06-07T08:00:01.589Z'},
        {name: 'oppor9', value: 7, type: 4, date: '2018-06-04T08:04:01.588Z'},
        {name: '华为p9', value: 1, type: 4, date: '2018-06-02T08:00:01.577Z'},
        {name: '华为p9', value: 2, type: 4, date: '2018-06-07T08:00:01.110Z'},
        {name: '华为p10', value: 1, type: 1, date: '2018-06-07T08:00:01.534Z'}
    ];
　　// 格式化时间 返回 年月日的格式
    function forMatterDate(_date){
        var date = new Date(_date);
        var Y = date.getFullYear() + '年';
        var M = (date.getMonth()+1 < 10 ? '0'+(date.getMonth()+1) : date.getMonth()+1) + '月';
        var D = date.getDate() + '日';

        return (Y+M+D);
    }
　　//比较俩个数的大小  
    function compare(property, desc) {
        return function (a, b) {
            var value1 = a[property];
            var value2 = b[property];
            if (desc == true) {                    //排序升序排列     
                return value1 - value2;
            } else {
                return value2 - value1;
            }
        }
    }
　　//判断对象是否为空对象
    function checkObj(object){
        var _mark = false;
        for(var _prop in object){
            if (object[_prop]==='') {

            }else {
                _mark = true;
            }
        }
        return _mark;
    }
    function printArray(arr) {
        var _length = arr.length, i = 0, _arr = [], _objArr = [];
        for (; i < _length; i++) {
            if (arr[i].type == 4) {
                _arr.push(arr[i]);
            }
        }
        var $length = _arr.length - 1, _i = 0 ;
        for (; _i < $length; _i++) {
            var _obj = {};
            if (_arr[_i].name == _arr[_i + 1].name) {
                _obj['name'] = _arr[_i].name;
                _obj.value = _arr[_i].value + _arr[_i + 1].value;
                _obj.date = _arr[_i].date;
            } else {

                for (var z = 0, length = _objArr.length, _mark = false; z < length; z++) {
                    if (_objArr[z].name == _arr[_i].name) {
                        _mark = true;
                    }
                }
                if (_mark == false) {
                    _obj.name = _arr[_i].name;
                    _obj.value = _arr[_i].value;
                    _obj.date = _arr[_i].date;
                }
            }
            if (checkObj(_obj) == false){

            } else {
                _objArr.push(_obj);
            }

        }
　　　　　//通过数组对象的某个键进行升降序排列 
        var _newObj = _objArr.sort(compare( 'value', false ));
        _newObj.map( function (i , index){
            var _data = _newObj[index];
            var _value = _data.name + ',' + forMatterDate(_data.date) + ',' + _data.value + '部';
            console.log(_value );
        })


    }

    printArray(arr)

</script>