手机端touch事件封装

    var touchEvent={

        /*单次触摸事件*/
        tap:function(element,fn){
            var startTx, startTy;
            element.addEventListener('touchstart',function(e){
              var touches = e.touches[0];
              startTx = touches.clientX;
              startTy = touches.clientY;
            }, false );

            element.addEventListener('touchend',function(e){
              var touches = e.changedTouches[0],
              endTx = touches.clientX,
              endTy = touches.clientY;
              // 在部分设备上 touch 事件比较灵敏，导致按下和松开手指时的事件坐标会出现一点点变化
              if( Math.abs(startTx - endTx) < 6 && Math.abs(startTy - endTy) < 6 ){
                fn();
              }
            }, false );
        },

        /*两次触摸事件*/
        doubleTap:function(element,fn){
            var isTouchEnd = false,
            lastTime = 0,
            lastTx = null,
            lastTy = null,
            firstTouchEnd = true,
            body = document.body,
            dTapTimer, startTx, startTy, startTime;
            element.addEventListener( 'touchstart', function(e){
              if( dTapTimer ){
                clearTimeout( dTapTimer );
                dTapTimer = null;
              }
              var touches = e.touches[0];
              startTx = touches.clientX;
              startTy = touches.clientY;
            }, false );
            element.addEventListener( 'touchend',function(e){
              var touches = e.changedTouches[0],
              endTx = touches.clientX,
              endTy = touches.clientY,
              now = Date.now(),
              duration = now - lastTime;
              // 首先要确保能触发单次的 tap 事件
              if( Math.abs(startTx - endTx) < 6 && Math.abs(startTx - endTx) < 6 ){
                // 两次 tap 的间隔确保在 500 毫秒以内
                if(duration < 301 ){
                  // 本次的 tap 位置和上一次的 tap 的位置允许一定范围内的误差
                  if( lastTx !== null &&
                    Math.abs(lastTx - endTx) < 45 &&
                    Math.abs(lastTy - endTy) < 45 ){
                      firstTouchEnd = true;
                      lastTx = lastTy = null;
                      fn();
                    }
                  }
                  else{
                    lastTx = endTx;
                    lastTy = endTy;
                  }
                }
                else{
                  firstTouchEnd = true;
                  lastTx = lastTy = null;
                }
                lastTime = now;
              }, false );
              // 在 iOS 的 safari 上手指敲击屏幕的速度过快，
              // 有一定的几率会导致第二次不会响应 touchstart 和 touchend 事件
              // 同时手指长时间的touch不会触发click
              if(~navigator.userAgent.toLowerCase().indexOf('iphone os')){
                body.addEventListener( 'touchstart', function(e){
                  startTime = Date.now();
                }, true );
                body.addEventListener( 'touchend', function(e){
                  var noLongTap = Date.now() - startTime < 501;
                  if(firstTouchEnd ){
                    firstTouchEnd = false;
                    if( noLongTap && e.target === element ){
                      dTapTimer = setTimeout(function(){
                        firstTouchEnd = true;
                        lastTx = lastTy = null;
                        fn();
                      },400);
                    }
                  }
                  else{
                    firstTouchEnd = true;
                  }
                }, true );
                // iOS 上手指多次敲击屏幕时的速度过快不会触发 click 事件
                element.addEventListener( 'click', function( e ){
                  if(dTapTimer ){
                    clearTimeout( dTapTimer );
                    dTapTimer = null;
                    firstTouchEnd = true;
                  }
                }, false );
            }
        },

        /*长按事件*/
        longTap:function(element,fn){
            var startTx, startTy, lTapTimer;
            element.addEventListener( 'touchstart', function( e ){
              if( lTapTimer ){
                clearTimeout( lTapTimer );
                lTapTimer = null;
              }
              var touches = e.touches[0];
              startTx = touches.clientX;
              startTy = touches.clientY;
              lTapTimer = setTimeout(function(){
                fn();
              }, 1000 );
              e.preventDefault();
            }, false );
            element.addEventListener( 'touchmove', function( e ){
              var touches = e.touches[0],
                endTx = touches.clientX,
                endTy = touches.clientY;
              if( lTapTimer && (Math.abs(endTx - startTx) > 5 || Math.abs(endTy - startTy) > 5) ){
                clearTimeout( lTapTimer );
                lTapTimer = null;
              }
            }, false );
            element.addEventListener( 'touchend', function( e ){
              if( lTapTimer ){
                clearTimeout( lTapTimer );
                lTapTimer = null;
              }
            }, false );
        },

        /*滑屏事件*/
        swipe:function(element,fn){
            var isTouchMove, startTx, startTy;
            element.addEventListener( 'touchstart', function( e ){
              var touches = e.touches[0];
              startTx = touches.clientX;
              startTy = touches.clientY;
              isTouchMove = false;
            }, false );
            element.addEventListener( 'touchmove', function( e ){
              isTouchMove = true;
              e.preventDefault();
            }, false );
            element.addEventListener( 'touchend', function( e ){
              if( !isTouchMove ){
                return;
              }
              var touches = e.changedTouches[0],
                endTx = touches.clientX,
                endTy = touches.clientY,
                distanceX = startTx - endTx
                distanceY = startTy - endTy,
                isSwipe = false;
              if( Math.abs(distanceX)>20||Math.abs(distanceY)>20 ){
                fn();
              }
            }, false );
        },

        /*向上滑动事件*/
        swipeUp:function(element,fn){
            var isTouchMove, startTx, startTy;
            element.addEventListener( 'touchstart', function( e ){
              var touches = e.touches[0];
              startTx = touches.clientX;
              startTy = touches.clientY;
              isTouchMove = false;
            }, false );
            element.addEventListener( 'touchmove', function( e ){
              isTouchMove = true;
              e.preventDefault();
            }, false );
            element.addEventListener( 'touchend', function( e ){
              if( !isTouchMove ){
                return;
              }
              var touches = e.changedTouches[0],
                endTx = touches.clientX,
                endTy = touches.clientY,
                distanceX = startTx - endTx
                distanceY = startTy - endTy,
                isSwipe = false;
              if( Math.abs(distanceX) < Math.abs(distanceY) ){
                  if( distanceY > 20 ){
                      fn();
                      isSwipe = true;
                  }
              }
            }, false );
        },

        /*向下滑动事件*/
        swipeDown:function(element,fn){
            var isTouchMove, startTx, startTy;
            element.addEventListener( 'touchstart', function( e ){
              var touches = e.touches[0];
              startTx = touches.clientX;
              startTy = touches.clientY;
              isTouchMove = false;
            }, false );
            element.addEventListener( 'touchmove', function( e ){
              isTouchMove = true;
              e.preventDefault();
            }, false );
            element.addEventListener( 'touchend', function( e ){
              if( !isTouchMove ){
                return;
              }
              var touches = e.changedTouches[0],
                endTx = touches.clientX,
                endTy = touches.clientY,
                distanceX = startTx - endTx
                distanceY = startTy - endTy,
                isSwipe = false;
              if( Math.abs(distanceX) < Math.abs(distanceY) ){
                  if( distanceY < -20  ){
                      fn();
                      isSwipe = true;
                  }
              }
            }, false );
        },

        /*向左滑动事件*/
        swipeLeft:function(element,fn){
            var isTouchMove, startTx, startTy;
            element.addEventListener( 'touchstart', function( e ){
              var touches = e.touches[0];
              startTx = touches.clientX;
              startTy = touches.clientY;
              isTouchMove = false;
            }, false );
            element.addEventListener( 'touchmove', function( e ){
              isTouchMove = true;
              e.preventDefault();
            }, false );
            element.addEventListener( 'touchend', function( e ){
              if( !isTouchMove ){
                return;
              }
              var touches = e.changedTouches[0],
                endTx = touches.clientX,
                endTy = touches.clientY,
                distanceX = startTx - endTx
                distanceY = startTy - endTy,
                isSwipe = false;
              if( Math.abs(distanceX) >= Math.abs(distanceY) ){
                  if( distanceX > 20  ){
                      fn();
                      isSwipe = true;
                  }
              }
            }, false );
        },

        /*向右滑动事件*/
        swipeRight:function(element,fn){
            var isTouchMove, startTx, startTy;
            element.addEventListener( 'touchstart', function( e ){
              var touches = e.touches[0];
              startTx = touches.clientX;
              startTy = touches.clientY;
              isTouchMove = false;
            }, false );
            element.addEventListener( 'touchmove', function( e ){
              isTouchMove = true;
              e.preventDefault();
            }, false );
            element.addEventListener( 'touchend', function( e ){
              if( !isTouchMove ){
                return;
              }
              var touches = e.changedTouches[0],
                endTx = touches.clientX,
                endTy = touches.clientY,
                distanceX = startTx - endTx
                distanceY = startTy - endTy,
                isSwipe = false;
              if( Math.abs(distanceX) >= Math.abs(distanceY) ){
                  if( distanceX < -20  ){
                      fn();
                      isSwipe = true;
                  }
              }
            }, false );
        }

    }

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