我编辑了标题。此外,如果我尝试再次拖动正在绘制的矩形以缩小它,它不会更新。我认为问题与矩形是与图像不同的元素(可能是孩子)有关.. 所以也许解决方案是为孩子们举办同样的活动?我试图做这样的事情,但仍然有问题。随意更改代码中的任何内容。
<HTML>
<HEAD>
<META http-equiv=imagetoolbar content=no>
<TITLE>
</TITLE>
<STYLE>
#rubberBand {
position: absolute;
visibility: hidden;
width: 0px; height: 0px;
border: 2px solid red;
}
</STYLE>
</HEAD>
<BODY>
<img name="myImage" id="myImage" src="VK.jpg" height=400
width=400>
<DIV ID="rubberBand"></DIV>
<SCRIPT>
var IMG;
function startRubber (evt) {
if (document.all) {
// IE
var r = document.all.rubberBand;
r.style.width = 0;
r.style.height = 0;
r.style.pixelLeft = event.x;
r.style.pixelTop = event.y;
r.style.visibility = 'visible';
IMG.ondragstart = cancelDragDrop; // otherwise IE will try to drag the image
}
else if (document.getElementById) {
// firefox
evt.preventDefault();
var r = document.getElementById('rubberBand');
r.style.width = 0;
r.style.height = 0;
r.style.left = evt.clientX + 'px';
r.style.top = evt.clientY + 'px';
r.style.visibility = 'visible';
r.onmouseup = stopRubber;
}
IMG.onmousemove = moveRubber;
}
function moveRubber (evt) {
if (document.all) { // IE
var r = document.all.rubberBand;
r.style.width = event.x - r.style.pixelLeft;
r.style.height = event.y - r.style.pixelTop;
}
else if (document.getElementById) { // firefox
var r = document.getElementById('rubberBand');
r.style.width = evt.clientX - parseInt(r.style.left);
r.style.height = evt.clientY - parseInt(r.style.top);
}
return false; // otherwise IE won't fire mouseup :/
}
function stopRubber (evt) {
IMG.onmousemove = null;
}
function cancelDragDrop()
{
window.event.returnValue = false;
}
IMG = document.getElementById('myImage');
IMG.onmousedown = startRubber;
IMG.onmouseup = stopRubber;
</SCRIPT>
</BODY>
</HTML>