ktouch移动端事件库

最近闲来无事，写了个移动端的事件库，代码贴在下面，大家勿拍。

 /**
  @version 1.0.0
  @author gangli
  @deprecated 移动端触摸事件库
  */
 (function () {
     "use strict";
     var util = {
         $: function (selector) {
             return document.querySelector(selector);
         },
         getEventInfo: function (e) {
             var _e = {};
             _e.pageX = e.changedTouches[0].pageX;
             _e.pageY = e.changedTouches[0].pageY;
             _e.target = e.target;
             return _e;
         }
     };
     var _tap = function (callback) {
         this.addEventListener('touchstart', function (e) {
             var _e = util.getEventInfo(e);
             _e.type = 'tap';
             callback.call(this, _e);
         }, false);
     };
     var _longtap = function (callback) {
         var interval = 800 , s , e , timer , el;
         this.addEventListener('touchstart', function (e) {
             var _e = util.getEventInfo(e);
             el = _e.target;
             s = Date.now();
             timer = setTimeout(function () {
                 _e.type = 'longtap';
                 callback.call(el, _e);
             }, interval);
         }, false);
         this.addEventListener('touchend', function (e) {
             clearTimeout(timer);
         }, false);
     };
     var _swipe = function (callback) {
         var s = {}, e = {}, d = {}, distance = 50,
             angle = 0,
             type;
         this.addEventListener('touchstart', function (evt) {
             var _e = util.getEventInfo(evt);
             s.x = _e.pageX;
             s.y = _e.pageY;
             evt.preventDefault();
         }, false);
         this.addEventListener('touchend', function (evt) {
             var _e = util.getEventInfo(evt);
             e.x = _e.pageX;
             e.y = _e.pageY;
             d.x = e.x - s.x;
             d.y = e.y - s.y;
             if (Math.abs(d.x) < distance && Math.abs(d.y) < distance) return false;
             angle = Math.abs(Math.atan((e.y - s.y) / (e.x - s.x)) / Math.PI * 180);
             if (angle > 45) {
                 type = d.y < 0 ? 'swipe-up' : 'swipe-down';
             } else {
                 type = d.x < 0 ? 'swipe-left' : 'swipe-right';
             }
             callback.call(this, {
                 type: type,
                 start: s,
                 end: e,
                 distance: d,
                 target: _e.target
             });
             evt.preventDefault();
         }, false);
     }
     var _drag = function (callback) {
         var dragStart = false, s = {}, e = {}, o = {};
         this.addEventListener('touchstart', function (evt) {
             dragStart = true;
             var _e = util.getEventInfo(evt);
             s.x = _e.pageX;
             s.y = _e.pageY;
             evt.preventDefault();
         }, false);
         this.addEventListener('touchmove', function (evt) {
             if (!dragStart) return;
             var _e = util.getEventInfo(evt);
             o.x = _e.pageX - s.x;
             o.y = _e.pageY - s.y;
             callback.call(this, {
                 type: "drag-move",
                 start: s,
                 offset: o,
                 target: _e.target
             });
         }, false);
         this.addEventListener('touchend', function (evt) {
             dragStart = false;
             var _e = util.getEventInfo(evt);
             e.x = _e.pageX;
             e.y = _e.pageY;
             callback.call(this, {
                 type: "drag-end",
                 start: s,
                 offset: o,
                 end: e,
                 target: _e.target
             });
         }, false);
     }
     var eventMap = {
         tap: _tap,
         swipe: _swipe,
         longtap: _longtap,
         drag: _drag
     }
     var ktouch = {
         ver: '1.0.0',
         on: function (el, type, fn) {
             try {
                 var el = util.$(el);
                 eventMap[type].call(el, fn);
                 return this;
             } catch (e) {
                 console.error('type error : %s is not allowed', type);
             }
         }
     }
     window.ktouch = ktouch;
 })();

github网址：https://github.com/kbqncf/ktouch