<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<meta content="width=device-width,initial-scale=1.0,maximum-scale=1.0" name="viewport"/>
<meta name="format-detection" content="telephone = no"/>
<title>手机上 拖动元素 </title>
</head>
<body>
<div id="indexbtn" style="width:100px;height:100px;background-color:black;position:absolute; "></div>
<script>
window.onload=function(){
var indexbtn = document.getElementById("indexbtn");
indexbtn.addEventListener('touchstart',touch,false);
indexbtn.addEventListener('touchmove',touch,false);
indexbtn.addEventListener('touchend',touch,false);
var x,y;
function touch(event){
var event = event || window.event;
switch(event.type){
case "touchstart":
console.log(event.changedTouches[0]);
x = parseInt(event.touches[0].clientX);
y = parseInt(event.touches[0].clientY);
break;
case "touchend":
console.log(event.changedTouches[0]);
y = parseInt(event.changedTouches[0].clientY);
x = parseInt(event.changedTouches[0].clientX);
indexbtn.style.top = y-50+"px";//50是原始宽度一半，
indexbtn.style.left = x-50+"px";//50是原始高度一半，
break;
case "touchmove":
event.preventDefault();
y = parseInt(event.touches[0].clientY);
x = parseInt(event.touches[0].clientX);
indexbtn.style.top = y-50+"px";
indexbtn.style.left = x-50+"px";
break;
}
}
}
</script>
</body>
</html>
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