拖动td的边框改变td大小

我想实现的效果是：往一个可编辑区域(iframe)里放入一个table后，当鼠标经过td的边框上时会变为双箭头，拖动鼠标可动态改变td的大小，请问该如果实现？谢谢！

解决方案 »

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一般来说是对div操作.td里面可以放个div
<html>
<head>
<title>鼠标拖动改变编辑表格大小</title>
<SCRIPT language=javascript>
var theobject = null;
function resizeObject() {
this.el        = null;
this.dir    = "";
this.grabx = null;
this.graby = null;
this.width = null;
this.height = null;
this.left = null;
this.top = null;
}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 = 8;
yMin = 8;el = getReal(event.srcElement, "className", "resizeMe");if (el.className == "resizeMe") {
   str = getDirection(el);
   if (str == "") str = "default";
   else str += "-resize";
   el.style.cursor = str;
}
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;
}
}
function getReal(el, type, value) {
temp = el;
while ((temp != null) && (temp.tagName != "BODY")) {
   if (eval("temp." + type) == value) {
    el = temp;
    return el;
   }
   temp = temp.parentElement;
}
return el;
}document.onmousedown = doDown;
document.onmouseup   = doUp;
document.onmousemove = doMove;
</SCRIPT><SCRIPT language=javascript>
var moz;
if (moz) {
extendElementModel();
extendEventObject();
emulateEventHandlers(["mousemove", "mousedown", "mouseup"]);
}
</SCRIPT></head>
<body><textarea id="simple" class="resizeMe" rows="10" cols="50">鼠标拖动可改变编辑表格大小</textarea></body>
</html>
这种方法太麻烦了，用ext或者是使用jquery吧，这些方法简单
5楼的效果非常好，不过，好像它说的是表格的TD。要加这个吧。
<table border="1">
<tr>
<td>
<textarea id="simple" class="resizeMe" rows="10" cols="50">鼠标拖动可改变编辑表格大小</textarea>
</td>
</tr>
</table>
非常5楼的laowowo，就这玩意儿，我找了好久，终于找到了，从心底感谢。