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JavaScript鼠标拖动

2016-06-11 21:23 288 查看

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>movemouse</title>
<style>
*{
margin: 0;
padding: 0;
}

#box{
width: 200px;
height: 200px;
background-color: rebeccapurple;
}
</style>
</head>
<body>
<div id="box" style="position: absolute;left: 0px; top: 0px;"></div>
</body>
<script>
var box = document.getElementById("box");

var dx = 0;
var dy = 0;

var flag = false;

box.onmousedown = function (e) {
var ent = e || window.event;

dx = ent.clientX - parseFloat(this.style.left);
dy = ent.clientY - parseFloat(this.style.top);

flag = true;
}

document.body.onmousemove = function (e) {
if(!flag) {
return;
}

var ent = e || window.event;

box.style.left = ent.clientX - dx + "px";
box.style.top = ent.clientY - dy + "px";
}

box.onmouseup = function (e) {
flag = false;
}

box.onmouseout = function (e) {
flag = false;
}
</script>
</html>

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