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js实现div拖拽.html

2014-09-01 09:19 363 查看

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head runat="server">

<title></title>

<script type="text/javascript">

var mouseX, mouseY;

var objX, objY;

var isDowm = false; //是否按下鼠标

function mouseDown(obj, e) {

obj.style.cursor = "move";

objX = div1.style.left;

objY = div1.style.top;

mouseX = e.clientX;

mouseY = e.clientY;

isDowm = true;

}

function mouseMove(e) {

var div = document.getElementById("div1");

var x = e.clientX;

var y = e.clientY;

if (isDowm) {

div.style.left = parseInt(objX) + parseInt(x) - parseInt(mouseX) + "px";

div.style.top = parseInt(objY) + parseInt(y) - parseInt(mouseY) + "px";

document.getElementById("span1").innerHTML = "x:" + div.style.top + " " + "y:" + div.style.left;

}

}

function mouseUp(e) {

if (isDowm) {

var x = e.clientX;

var y = e.clientY;

var div = document.getElementById("div1");

div.style.left = (parseInt(x) - parseInt(mouseX) + parseInt(objX)) + "px";

div.style.top = (parseInt(y) - parseInt(mouseY) + parseInt(objY)) + "px";

document.getElementById("span2").innerHTML = "x:" + div.style.top + " " + "y:" + div.style.left;

mouseX = x;

rewmouseY = y;

div1.style.cursor = "default";

isDowm = false;

}

}

</script>

</head>

<body>

<span id="span1"></span></br><span id="span2"></span></br>

<div id="div1" style="background-color: Green; border: 1px solid red; height: 300px;

top: 100px; left: 100px; width: 300px; position: absolute;" onmousedown="mouseDown(this,event)"

onmousemove="mouseMove(event)" onmouseup="mouseUp(event)">

</div>

</body>

</html>

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