移动端touch事件封装

<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=no">
<title>无标题文档</title>
<style>
div{width:100px;height:100px;line-height:100px;margin-bottom:10px;background:red;text-align:center;color:#fff;}
</style>
<script>
/***
@name:触屏事件
@param {string} element dom元素
{function} fn 事件触发函数
***/

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 ); 
}

}
</script>
<script>
window.onload=function(){
var aDiv=document.getElementsByTagName("div");

touchEvent.tap(aDiv[0],function(){
alert("单次触摸");
})

touchEvent.doubleTap(aDiv[1],function(){
alert("两次触摸");
})

touchEvent.longTap(aDiv[2],function(){
alert("长按");
})

touchEvent.swipe(document,function(){
alert("滑屏了");
})

touchEvent.swipeUp(document,function(){
alert("向上滑屏了");
})

touchEvent.swipeDown(document,function(){
alert("向下滑屏了");
})

touchEvent.swipeLeft(document,function(){
alert("向左滑屏了");
})

touchEvent.swipeRight(document,function(){
alert("向右滑屏了");
})
}

</script>
</head>
<body>
<div class="box1">单次触摸我</div>
<div class="box2">两次触摸</div>
<div class="box3">长按我</div>
<span>试一试在屏幕上任意区域滑动</span>
</body>
</html>