js数组对象去重或合并数组对象中的指定值

var arrs = [
        {"id": "1","name": "张三","value": "1245"},
        {"id": "1","name": "张三","value": "1360"},
        {"id": "2","name": "李四","value": "1120"},
        {"id": "2","name": "李四","value": "1362"},
        {"id": "2","name": "李四","value": "1008"},
        {"id": "3","name": "王五","value": "1360"},
        {"id": "4","name": "赵六","value": "1986"},
        {"id": "4","name": "赵六","value": "1240"}
    ];
    function duplicate(arr) {
        var map = {},
            dest = [];
        for (var i = 0; i < arr.length; i++) {
            var ai = arr[i];
            if (!map[ai.id]) {
                dest.push({
                    id: ai.id,
                    name: ai.name,
                    value: ai.value
                });
                map[ai.id] = ai;
            } else {
                for (var j = 0; j < dest.length; j++) {
                    var dj = dest[j];
                    if (dj.id == ai.id) {
                        dj.value = (parseFloat(dj.value) + parseFloat(ai.value)).toString();
                        break;
                    }
                }
            }
        };
        return dest
    }
    console.log(this.duplicate(arrs))