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html 代码片段
“http://www.w3.org/TR/html4/strict.dtd”>
<html xmlns=”http://www.w3.org/1999/xhtml” lang=”en”>
<head>
<meta http-equiv=”Content-Type” content=”text/html; charset=utf-8″ />
<title>原生js拖拽效果</title>
<style type=”text/css”>
* {
margin: 0;
padding: 0;
}
#box {
position: absolute;
left: 0;
top: 0;
width: 100px;
height: 100px;
background: #f60;
}
</style>
</head>
<body>
<div id=”box”></div>
<script type=”text/javascript”>
var oBox = document.getElementById(‘box’);
oBox.onmousedown = function (e) {
var oEvent = e || window.event,
disL = oEvent.clientX – oBox.offsetLeft,
disT = oEvent.clientY – oBox.offsetTop,
maxL = document.documentElement.clientWidth – oBox.offsetWidth,
maxT = document.documentElement.clientHeight – oBox.offsetHeight;
document.onmousemove = function (e) {
var oEvent = e || window.event,
disX = oEvent.clientX – disL,
disY = oEvent.clientY – disT;
//console.log(disX);
if (disX <= 0) { disX = 0 }
if (disY <= 0) { disY = 0 }
if (disX >= maxL) { disX = maxL }
if (disY >= maxT) { disY = maxT }
oBox.style.left = disX + ‘px’;
oBox.style.top = disY + ‘px’;
}
}
document.onmouseup = function () {
document.onmousemove = null;
}
</script>
</body>
</html>
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