TypeScript 中的 "=>" 真的很好用!!!

class funs
{　public $scope: IBarPadScope; constructor($scope: IBarPadScope) { this.$scope = $scope; }
    public createLoadPhoneOrders(startTime?: string): () => void {
        return () => {
            startTime = startTime || moment().format("YYYY-MM-DD 00:00:00");
            this.$scope.socket.emit('command',
                {
                    command: 'query',
                    data: {
                        Node: this.$scope.sys.node,
                        CreatedTime: { '$gte': startTime }
                    },
                    document:'PhoneOrders'
                },
                (err, r: PhoneOrder[]) => {
                    this.$scope.$apply(() =>
                    {
                        this.$scope.allPhoneOrders = r;
                    });
            });
        };
    }
}

可以看到多级子函数调用 this一直指向的是funs的实例

看看编译出来的js的代码

funs.prototype.createLoadPhoneOrders = function (startTime) {
var _this = this;
return function () {
            startTime = startTime || moment().format("YYYY-MM-DD 00:00:00");
            _this.$scope.socket.emit('command', {
                command: 'query',
                data: {
                    Node: _this.$scope.sys.node,
                    CreatedTime: { '$gte': startTime }
                },
                document: 'PhoneOrders'
            }, function (err, r) {
                _this.$scope.$apply(function () {
                    _this.$scope.allPhoneOrders = r;
                });
            });
        };
    };