移動端長按事件

  // callback:長按回調

        // longTime:長按時間

        function LongTouch(dom, callback, longTime) {

            var that = this;

            that.dom = dom;

            that.fn = function() {

                var startTime = new Date().getTime();

                that.timer = setInterval(function() {

                    var endTime = new Date().getTime();

                    if (endTime - startTime >= longTime) {

                        callback();

                        clearInterval(that.timer);

                    }

                }, 10);

            }

            that.dom.addEventListener("touchstart", that.fn, false)

            that.dom.addEventListener("touchend", function() {

                clearInterval(that.timer);

            }, false);

        }

         // 解綁長按事件

        LongTouch.prototype.detachEvent = function() {

            var that = this;

            that.dom.removeEventListener("touchstart", that.fn, false);

        }