📄 27.html
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<html>
<head>
<title>随意拖动图片</title>
<style type="text/css">
#plane1 {position:absolute; left:0; top:50; width:100; z-index:0}
#plane2 {position:absolute; left:600; top:50; width:100; z-index:0}
</style>
<SCRIPT LANGUAGE="JavaScript">
var isNav, isIE
if (parseInt(navigator.appVersion) >= 4) {
if (navigator.appName == "Netscape") {
isNav = true
} else {
isIE = true
}
}
function setZIndex(obj, zOrder) {
obj.zIndex = zOrder
}
function shiftTo(obj, x, y) {
if (isNav) {
obj.moveTo(x,y)
} else {
obj.pixelLeft = x
obj.pixelTop = y
}
}
var selectedObj
var offsetX, offsetY
function setSelectedElem(evt) {
if (isNav) {
var testObj
var clickX = evt.pageX
var clickY = evt.pageY
for (var i = document.layers.length - 1; i >= 0; i--) {
testObj = document.layers[i]
if ((clickX > testObj.left) &&
(clickX < testObj.left + testObj.clip.width) &&
(clickY > testObj.top) &&
(clickY < testObj.top + testObj.clip.height)) {
// if so, then set the global to the layer, bring it
// forward, and get outa here
selectedObj = testObj
setZIndex(selectedObj, 100)
return
}
}
} else {
var imgObj = window.event.srcElement
if (imgObj.parentElement.id.indexOf("plane") != -1) {
selectedObj = imgObj.parentElement.style
setZIndex(selectedObj,100)
return
}
}
selectedObj = null
return
}
function dragIt(evt) {
if (selectedObj) {
if (isNav) {
shiftTo(selectedObj, (evt.pageX - offsetX), (evt.pageY - offsetY))
} else {
shiftTo(selectedObj, (window.event.clientX - offsetX), (window.event.clientY - offsetY))
return false
}
}
}
function engage(evt) {
setSelectedElem(evt)
if (selectedObj) {
if (isNav) {
offsetX = evt.pageX - selectedObj.left
offsetY = evt.pageY - selectedObj.top
} else {
offsetX = window.event.offsetX
offsetY = window.event.offsetY
}
}
return false
}
function release(evt) {
if (selectedObj) {
setZIndex(selectedObj, 0)
selectedObj = null
}
}
function setNavEventCapture() {
if (isNav) {
document.captureEvents(Event.MOUSEDOWN | Event.MOUSEMOVE | Event.MOUSEUP)
}
}
function init() {
if (isNav) {
setNavEventCapture()
}
document.onmousedown = engage
document.onmousemove = dragIt
document.onmouseup = release
}
</SCRIPT>
</head>
<body bgcolor="lightyellow" onLoad="init()">
拖动图片看看
<DIV ID=plane1><IMG NAME="planePic1" SRC="06.gif" BORDER=0 width=100></DIV>
<DIV ID=plane2><IMG NAME="planePic1" SRC="07.gif" BORDER=0 width=100></DIV>
</body>
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