移动端的点透
当上层元素发生点击的时候，下层元素也有点击（焦点）特性，
在300S之后，如果上层元素消失或隐藏，目标点就会漂移到下层元素身上，
就会触发点击行为。
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,user-scalable=no"/>
<title></title>
<style>
#div1{
width: 200px;
height: 200px;
background-color: red;
position: absolute;
left: 0;
top:0;
opacity: 0.5;
}
</style>
</head>
<body>
<a href="http://www.miaov.com">点我！！！！</a>
<div id="div1">1</div>
<script>
var div = document.getElementById("div1");
div.addEventListener('touchend',end);
function end(){
this.style.display = 'none';
}
</script>
</body>
</html>
解决：
1.下层不要使用有点击（焦点）特性的元素
<p>点我!!!!</p>
<!--<a href="http://www.miaov.com">点我！！！！</a>-->
2.阻止pc的事件
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,user-scalable=no"/>
<title></title>
<style>
#div1{
width: 200px;
height: 200px;
background-color: red;
position: absolute;
left: 0;
top:0;
opacity: 0.5;
}
</style>
</head>
<body>
<a href="http://www.miaov.com">点我！！！！</a>
<div id="div1">1</div>
<script>
document.addEventListener('touchstart',function(ev){
ev.preventDefault();
});
var div = document.getElementById("div1");
var a = document.getElementById("a");
div.addEventListener('touchend',end);
a.addEventListener('touchstart',function(){
window.location.href = 'http://www.miaov.com';
})
function end(){
this.style.display = 'none';
}
</script>
</body>
</html>
