标签：tar swipe pre mat rtx rem asc starty als
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<style type="text/css">
.touch-box{
background-color: #444;
color:white;
width: 200px;
height: 200px;
}
</style>
<div id="touch-box" class="touch-box"></div>
<script type="text/javascript">
var bgColors=[‘#BB0D0D‘,‘#189135‘,‘#1173C0‘];
var idx=0;
var el=document.getElementById(‘touch-box‘);
var startX,startY;
function handleStart(e){
if(e.touches.length!==1) return
startX=e.touches[0].pageX;
startY=e.touches[0].pageY;
el.addEventListener(‘touchmove‘,handleMove,false);
}
function handleMove(e){
var touches=e.touches;
if(touches&&touches.length){
var deltaX=startX-touches[0].pageX;
var deltaY=startY-touches[0].pageY;
if(deltaX>50){
console.log(‘swipeLeft‘);
idx=(idx+1)%3;
el.style.backgroundColor=bgColors[idx];
}
if(deltaX>-50){
console.log(‘swipeRight‘);
idx=idx>=1?idx-1:2;
el.style.backgroundColor=bgColors[idx];
}
if(deltaY>50){
console.log(‘swipeTop‘);
}
if(deltaY<-50){
console.log(‘swipeDown‘)
}
if(Math.abs(deltaX)>=50||Math.abs(deltaY)>=50){
el.removeEventListener(‘touchmove‘,handleMove);
}
}
event.preventDefault();
}
el.addEventListener(‘touchstart‘,handleStart);
</script>
</body>
</html>
分别取touchstart事件和touchmove事件中事件对象（e.touches[0]）的pageX和pageY属性，相减后进行判断，判断之后记得移除touchmove事件
标签：tar swipe pre mat rtx rem asc starty als
原文地址：http://www.cnblogs.com/YutaoZhou/p/6682241.html
