可以上下左右滚动的经典代码

一个可以上下左右滚动的经典代码。

<HTML>
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<HEAD>
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<TITLE>滚动效果</TITLE>
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</HEAD>
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<BODY STYLE="overflow: hidden; border: 0" topmargin=0 leftmargin=0>
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<table>
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<tr><td style="padding: 5">
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<div id="testDiv" style="border: buttonface 2 solid">
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<img src="http://bbs.blueidea.com/images/blue/logo.gif">
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</div>
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function scroll(obj, oWidth, oHeight, direction, drag, zoom, speed)
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{
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var scrollDiv = obj
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var scrollContent = document.createElement("span")
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scrollContent.style.position = "absolute"
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scrollDiv.applyElement(scrollContent, "inside")
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var displayWidth = (oWidth != "auto" && oWidth ) ? oWidth : scrollContent.offsetWidth + parseInt(scrollDiv.currentStyle.borderRightWidth)
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var displayHeight = (oHeight != "auto" && oHeight) ? oHeight : scrollContent.offsetHeight + parseInt(scrollDiv.currentStyle.borderBottomWidth)
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var contentWidth = scrollContent.offsetWidth
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var contentHeight = scrollContent.offsetHeight
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var scrollXItems = Math.ceil(displayWidth / contentWidth) + 1
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var scrollYItems = Math.ceil(displayHeight / contentHeight) + 1
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scrollDiv.style.width = displayWidth
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scrollDiv.style.height = displayHeight
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scrollDiv.style.overflow = "hidden"
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scrollDiv.setAttribute("state", "stop")
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scrollDiv.setAttribute("drag", drag ? drag : "horizontal")
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scrollDiv.setAttribute("direction", direction ? direction : "left")
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scrollDiv.setAttribute("zoom", zoom ? zoom : 1)
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scrollContent.style.zoom = scrollDiv.zoom
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var scroll_script = "var scrollDiv = " + scrollDiv.uniqueID +"\n"+
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"var scrollObj = " + scrollContent.uniqueID +"\n"+
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"var contentWidth = " + contentWidth + " * (scrollObj.runtimeStyle.zoom ? scrollObj.runtimeStyle.zoom : 1)" +"\n"+
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"var contentHeight = " + contentHeight + " * (scrollObj.runtimeStyle.zoom ? scrollObj.runtimeStyle.zoom : 1)" +"\n"+
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"var scrollx = scrollObj.runtimeStyle.pixelLeft" +"\n"+
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"var scrolly = scrollObj.runtimeStyle.pixelTop" +"\n"+
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"switch (scrollDiv.state.toLowerCase())" +"\n"+
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"{" +"\n"+
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"case ('scroll') :" +"\n"+
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"switch (scrollDiv.direction)" +"\n"+
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"{" +"\n"+
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"case ('left') :" +"\n"+
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"scrollx = (--scrollx) % contentWidth" +"\n"+
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"break" +"\n"+
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"case ('right') :" +"\n"+
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"scrollx = -contentWidth + (++scrollx) % contentWidth" +"\n"+
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"break" +"\n"+
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"case ('up') :" +"\n"+
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"scrolly = (--scrolly) % contentHeight" +"\n"+
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"break" +"\n"+
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"case ('down') :" +"\n"+
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"scrolly = -contentHeight + (++scrolly) % contentHeight" +"\n"+
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"break" +"\n"+
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"case ('left_up') :" +"\n"+
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"scrollx = (--scrollx) % contentWidth" +"\n"+
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"scrolly = (--scrolly) % contentHeight" +"\n"+
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"break" +"\n"+
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"case ('left_down') :" +"\n"+
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"scrollx = (--scrollx) % contentWidth" +"\n"+
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"scrolly = -contentHeight + (++scrolly) % contentHeight" +"\n"+
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"break" +"\n"+
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"case ('right_up') :" +"\n"+
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"scrollx = -contentWidth + (++scrollx) % contentWidth" +"\n"+
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"scrolly = (--scrolly) % contentHeight" +"\n"+
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"break" +"\n"+
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"case ('right_down') :" +"\n"+
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"scrollx = -contentWidth + (++scrollx) % contentWidth" +"\n"+
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"scrolly = -contentHeight + (++scrolly) % contentHeight" +"\n"+
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"break" +"\n"+
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"default :" +"\n"+
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"return" +"\n"+
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"}" +"\n"+
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"scrollObj.runtimeStyle.left = scrollx" +"\n"+
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"scrollObj.runtimeStyle.top = scrolly" +"\n"+
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"break" +"\n"+
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"case ('stop') :" +"\n"+
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"case ('drag') :" +"\n"+
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"default :" +"\n"+
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"return" +"\n"+
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"}"
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var contentNode = document.createElement("span")
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contentNode.runtimeStyle.position = "absolute"
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contentNode.runtimeStyle.width = contentWidth
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scrollContent.applyElement(contentNode, "inside")
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for (var i=0; i <= scrollXItems; i++)
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{
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for (var j=0; j <= scrollYItems ; j++)
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{
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if (i+j == 0) continue
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var tempNode = contentNode.cloneNode(true)
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var contentLeft, contentTop
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scrollContent.insertBefore(tempNode)
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contentLeft = contentWidth * i
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contentTop = contentHeight * j
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tempNode.runtimeStyle.left = contentLeft
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tempNode.runtimeStyle.top = contentTop
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}
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}
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scrollDiv.onpropertychange = function()
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{
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var propertyName = window.event.propertyName
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var propertyValue = eval("this." + propertyName)
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switch(propertyName)
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{
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case "zoom" :
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var scrollObj = this.children[0]
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scrollObj.runtimeStyle.zoom = propertyValue
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var content_width = scrollObj.children[0].offsetWidth * propertyValue
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var content_height = scrollObj.children[0].offsetHeight * propertyValue
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scrollObj.runtimeStyle.left = -content_width + (scrollObj.runtimeStyle.pixelLeft % content_width)
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scrollObj.runtimeStyle.top = -content_height + (scrollObj.runtimeStyle.pixelTop % content_height)
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break
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}
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}
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scrollDiv.onlosecapture = function()
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{
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this.state = this.tempState ? this.tempState : this.state
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this.runtimeStyle.cursor = ""
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this.removeAttribute("tempState")
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this.removeAttribute("start_x")
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this.removeAttribute("start_y")
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this.removeAttribute("default_left")
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this.removeAttribute("default_top")
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}
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scrollDiv.onmousedown = function()
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{
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if (this.state != "drag") this.setAttribute("tempState", this.state)
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this.state = "drag"
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this.runtimeStyle.cursor = "default"
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this.setAttribute("start_x", event.clientX)
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this.setAttribute("start_y", event.clientY)
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this.setAttribute("default_left", this.children[0].style.pixelLeft)
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this.setAttribute("default_top", this.children[0].style.pixelTop)
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this.setCapture()
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}
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scrollDiv.onmousemove = function()
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{
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if (this.state !=

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