可以改变大小的窗口,JavaScript

<body><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: 200px;top:200px;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>
<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>　</p>
</div>
</div>
<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, yPos, str, xMin, yMin;
xMin = 20; //The smallest width possible
yMin = 20; // height

el = getReal(event.srcElement, "className", "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.pixelWidth = Math.max(xMin, theobject.width + window.event.clientX - theobject.grabx);

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

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

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

document.onmousedown = doDown;
document.onmouseup = doUp;
document.onmousemove = doMove;

</SCRIPT>