智能社拖拽demo
<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<style>#div1 {
width: 100px;
height: 100px;
background: red;
position: absolute;
}
#div2 {
width: 400px;
height: 300px;
background: #CCC;
position: relative;
}</style>
<script>window.onload = function () {
var oDiv = document.getElementById('div1');
var oDiv2 = document.getElementById('div2');
var disX = 0;
var disY = 0;
oDiv.onmousedown = function (ev) { //4 放在里面
var oEvent = ev || event;
disX = oEvent.clientX - oDiv.offsetLeft;
disY = oEvent.clientY - oDiv.offsetTop;
document.onmousemove = function (ev) { //3
var oEvent = ev || event;
var l = oEvent.clientX - disX;
var t = oEvent.clientY - disY;
if (l < 0) {
l = 0;
} else if (l > oDiv2.offsetWidth - oDiv.offsetWidth) {
l = oDiv2.offsetWidth - oDiv.offsetWidth;
}
if (t < 0) {
t = 0;
} else if (t > oDiv2.offsetHeight - oDiv.offsetHeight) {
t = oDiv2.offsetHeight - oDiv.offsetHeight;
}
oDiv.style.left = l + 'px';
oDiv.style.top = t + 'px';
};
document.onmouseup = function () {
document.onmousemove = null;//2
document.onmouseup = null;
};
return false;//1
};
};</script>
</head>
<body>
<div id="div2">
<div id="div1"></div>
</div>
</body>
</html>
本文标题:智能社拖拽demo
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