改变层的大小

<html>

<head>
<title>改变层的大小-51windows.com－www.51windows.Net</title>
<meta content="text/html; charset=gb2312" http-equiv="Content-Type">
<style> {
box-sizing: border-box; moz-box-sizing: border-box
}
#testDiv { background-color: buttonface; background-repeat: repeat;
background-attachment: scroll; color: #3969A5; height: 300px;
left: 30px; overflow: hidden; width: 500; z-index: 2;
border: 2px outset white; margin: 0px; padding: 2px;
background-position: 0% 50% }
body { font-family: Verdana; font-size: 9pt }
#innerNice { background-color: white; background-repeat: repeat; background-attachment:
scroll; color: #3969A5; height: 100%; overflow: auto; width:
100%; border: 2px inset white; padding: 8px;
background-position: 0% 50% }
</style>

<SCRIPT language=javascript>
/
// Generic Resize by Erik Arvidsson //
// //
// You may use this script as long as this disclaimer is remained. //
// See www.dtek.chalmers.se/~d96erik/dhtml/ for mor info //
// //
// How to use this script! //
// Link the script in the HEAD and create a container (DIV,preferable //
// absolute positioned) and add the class="resizeMe" to it. //
/

var theobject = null; //This gets a value as soon as a resize start

function resizeObject() {
this.el = null; //pointer to the object
this.dir = ""; //type of current resize (n,s,e,w,ne,nw,se,sw)
this.grabx = null; //Some useful values
this.graby = null;
this.width = null;
this.height = null;
this.left = null;
this.top = null;
}

//Find out what kind of resize! Return a string inlcluding the directions
function getDirection(el) {
var xPos,yPos,offset,dir;
dir = "";

xPos = window.event.offsetX;
yPos = window.event.offsetY;

offset = 8; //The distance from the edge in pixels

if (yPos<offset) dir += "n";
else if (yPos > el.offsetHeight-offset) dir += "s";
if (xPos<offset) dir += "w";
else if (xPos > el.offsetWidth-offset) dir += "e";

return dir;
}

function doDown() {
var el = getReal(event.srcElement,"className","resizeMe");

if (el == null) {
theobject = null;
return;
}

dir = getDirection(el);
if (dir == "") return;

theobject = new resizeObject();

theobject.el = el;
theobject.dir = dir;

theobject.grabx = window.event.clientX;
theobject.graby = window.event.clientY;
theobject.width = el.offsetWidth;
theobject.height = el.offsetHeight;
theobject.left = el.offsetLeft;
theobject.top = el.offsetTop;

window.event.returnValue = false;
window.event.cancelBubble = true;
}

function doUp() {
if (theobject != null) {
theobject = null;
}
}

function doMove() {
var el,xPos,str,xMin,yMin;
xMin = 8; //The smallest width possible
yMin = 8; // height

el = getReal(event.srcElement,"resizeMe");

if (el.className == "resizeMe") {
str = getDirection(el);
//Fix the cursor
if (str == "") str = "default";
else str += "-resize";
el.style.cursor = str;
}

//Dragging starts here
if(theobject != null) {
if (dir.indexOf("e") != -1)
theobject.el.style.width = Math.max(xMin,theobject.width + window.event.clientX - theobject.grabx) + "px";

if (dir.indexOf("s") != -1)
theobject.el.style.height = Math.max(yMin,theobject.height + window.event.clientY - theobject.graby) + "px";

if (dir.indexOf("w") != -1) {
theobject.el.style.left = Math.min(theobject.left + window.event.clientX - theobject.grabx,theobject.left + theobject.width - xMin) + "px";
theobject.el.style.width = Math.max(xMin,theobject.width - window.event.clientX + theobject.grabx) + "px";
}
if (dir.indexOf("n") != -1) {
theobject.el.style.top = Math.min(theobject.top + window.event.clientY - theobject.graby,theobject.top + theobject.height - yMin) + "px";
theobject.el.style.height = Math.max(yMin,theobject.height - window.event.clientY + theobject.graby) + "px";
}

window.event.returnValue = false;
window.event.cancelBubble = true;
}
}

document.onmousedown = doDown;
document.onmouseup = doUp;
document.onmousemove = doMove;
</SCRIPT>

<body>

<div class="resizeMe" id="testDiv">
<div id="innerNice">
<p align="center">　</p>
<p align="center">
请在边框处拖动鼠标
<p>　</p>
<p>　</p>
<p>　</p>
</div>
</div>
</body>
</html>

原文地址：https://david.blog.csdn.net

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