touch方向锁定
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width">
<meta charset="utf-8">
<title></title>
<style media="screen">
.box {width:200px; height:200px; background:#CCC; transform:translate(0px,0px);}
</style>
<script>
window.onload=function (){
let oBox=document.getElementsByClassName('box')[0];
let x=0,y=0;
oBox.addEventListener('touchstart', function (ev){
let dir='';
let disX=ev.targetTouches[0].clientX-x;
let disY=ev.targetTouches[0].clientY-y;
let startX=ev.targetTouches[0].clientX;
let startY=ev.targetTouches[0].clientY;
function fnMove(ev){
if(dir==''){
//等待方向确定——用户超出5px
if(Math.abs(ev.targetTouches[0].clientX-startX)>=5){
dir='x';
}else if(Math.abs(ev.targetTouches[0].clientY-startY)>=5){
dir='y';
}
}else{
if(dir=='x'){
x=ev.targetTouches[0].clientX-disX;
}else if(dir=='y'){
y=ev.targetTouches[0].clientY-disY;
}
oBox.style.transform=`translate(${x}px,${y}px)`;
}
}
function fnEnd(){
oBox.removeEventListener('touchmove', fnMove, false);
oBox.removeEventListener('touchend', fnEnd, false);
}
oBox.addEventListener('touchmove', fnMove, false);
oBox.addEventListener('touchend', fnEnd, false);
}, false);
};
</script>
</head>
<body>
<div class="box">
</div>
</body>
</html>
targetTouches vs touches
1.兼容
跟按下的位置相比，如果横向移动超过5px，锁定为水平；如果纵向移动超过5px，锁定为垂直
1.阶段一、方向确定之前——压根不动
2.阶段二、方向已经确定了，再动
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<meta name="viewport" content="width=device-width">
<style media="screen">
* {margin:0; padding:0; list-style:none;}
html {font-size:10px}
header {width:48rem;height:5.5rem;background:#fe5400; overflow:hidden; position:relative; z-index:99;}
header h1 {width:4.4rem; height:3.7rem; background:url(img/logo.png) no-repeat; text-indent:-9999rem; background-size:100% 100%; margin-left:0.6rem; margin-top:1rem;}
/*banner*/
.banner {width:48rem; height:15rem; position:relative; overflow:hidden;}
.banner ul {width:999rem; height:15rem; overflow:hidden; transform:translateX(-48rem);}
.banner ul li {width:48rem; height:15rem; float:left;}
.banner ul li img {width:100%; height:100%;}
.banner ol {position: absolute; right:0; bottom: 1.3rem;}
.banner ol li {width:1rem; height:1rem; border:1px solid #333; background:white; border-radius:50%; margin:0 0.4rem; opacity:0.6; float:left;}
.banner ol li.active {background:#ff5501; border:1px solid #d0a793; opacity:1}
/**/
.page_content {background:white; position:relative; top:-5rem;}
.load {height:5rem; line-height:5rem; text-align:center; font-size:2rem;}
</style>
<script>
window.onresize=function (){
document.documentElement.style.fontSize=document.documentElement.clientWidth/48+'px';
};
window.onresize();
window.onload=function (){
let oBanner=document.querySelector('.banner');
let oBannerUl=oBanner.children[0];
let oBannerUlLi=oBannerUl.children;
let oPageContent=document.querySelector('.page_content');
let oLoad=document.querySelector('.load');
let aOlLi=document.querySelectorAll('.banner ol li');
//
oBannerUl.appendChild(oBannerUlLi[0].cloneNode(true));
oBannerUl.insertBefore(oBannerUlLi[oBannerUlLi.length-2].cloneNode(true), oBannerUlLi[0]);
let x=-oBannerUlLi[0].offsetWidth,y=0;
oBanner.addEventListener('touchstart', function (ev){
oPageContent.style.transition='none';
oBannerUl.style.transition='none';
let startX=ev.targetTouches[0].clientX;
let startY=ev.targetTouches[0].clientY;
let disX=startX-x;
let disY=startY-y;
let dir='';
function fnMove(ev){
if(dir==''){
if(Math.abs(ev.targetTouches[0].clientX-startX)>=5){
dir='x';
}else if(Math.abs(ev.targetTouches[0].clientY-startY)>=5){
dir='y';
}
}else{
if(dir=='x'){
x=ev.targetTouches[0].clientX-disX;
}else{
y=ev.targetTouches[0].clientY-disY;
}
oBannerUl.style.transform=`translateX(${x}px)`;
if(y>0){
oPageContent.style.transform=`translateY(${y/3}px)`;
if(y>200){
oLoad.innerHTML='松手';
}else{
oLoad.innerHTML='下拉刷新';
}
}else{
oPageContent.style.transform=`translateY(${y}px)`;
}
}
}
function fnEnd(){
oBanner.removeEventListener('touchmove', fnMove, false);
oBanner.removeEventListener('touchend', fnEnd, false);
if(y>0){
y=0;
oPageContent.style.transition='0.3s all ease';
oPageContent.style.transform=`translateY(0px)`;
}
//
let n=Math.round(-x/oBannerUl.children[0].offsetWidth);
x=-n*oBannerUl.children[0].offsetWidth;
console.log(n, oBannerUlLi.length);
if(n==oBannerUlLi.length-1){
x=-oBannerUlLi[0].offsetWidth;
oBannerUl.style.transition='';
oBannerUl.style.transform=`translateX(${x}px)`;
n=1;
Array.from(aOlLi).forEach((li,index)=>{
li.className=index==0?'active':'';
})
return
}else if(n==0){
x=-(oBannerUlLi.length-2)*oBannerUlLi[0].offsetWidth;
oBannerUl.style.transition='';
oBannerUl.style.transform=`translateX(${x}px)`;
n=oBannerUlLi.length-1;
Array.from(aOlLi).forEach((li,index)=>{
li.className=index==oBannerUlLi.length-2?'active':'';
})
return
}
oBannerUl.style.transition='0.3s all ease';
oBannerUl.style.transform=`translateX(${x}px)`;
Array.from(aOlLi).forEach((li,index)=>{
li.className=index==n?'active':'';
})
}
oBanner.addEventListener('touchmove', fnMove, false);
oBanner.addEventListener('touchend', fnEnd, false);
}, false);
};
</script>
</head>
<body>
<header>
<h1>淘宝网</h1>
</header>
<div class="load">
下拉刷新
</div>
<div class="page_content">
<section class="banner">
<ul>
<li><img src="img/banner1.jpg" /></li>
<li><img src="img/banner2.jpg" /></li>
<li><img src="img/banner1.jpg" /></li>
<li><img src="img/banner2.jpg" /></li>
<li><img src="img/banner1.jpg" /></li>
<li><img src="img/banner2.jpg" /></li>
</ul>
<ol>
<li class="active"></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
</ol>
</section>
<nav>
</nav>
</div>
</body>
</html>
