js无缝横向滚动图片SeamlessScrolling3

var sina = {
 $: function(objName) {
 if (document.getElementById) {
 return eval('document.getElementById("' + objName + '")')
 } else {
 return eval('document.all.' + objName)
 }
 },
 isIE: navigator.appVersion.indexOf("MSIE") != -1 ? true : false,
 addEvent: function(l, i, I) {
 if (l.attachEvent) {
 l.attachEvent("on" + i, I)
 } else {
 l.addEventListener(i, I, false)
 }
 },
 delEvent: function(l, i, I) {
 if (l.detachEvent) {
 l.detachEvent("on" + i, I)
 } else {
 l.removeEventListener(i, I, false)
 }
 },
 readCookie: function(O) {
 var o = "",
 l = O + "=";
 if (document.cookie.length > 0) {
 var i = document.cookie.indexOf(l);
 if (i != -1) {
 i += l.length;
 var I = document.cookie.indexOf(";", i);
 if (I == -1) I = document.cookie.length;
 o = unescape(document.cookie.substring(i, I))
 }
 }
 return o
 },
 writeCookie: function(i, l, o, c) {
 var O = "",
 I = "";
 if (o != null) {
 O = new Date((new Date).getTime() + o * 3600000);
 O = "; expires=" + O.toGMTString()
 }
 if (c != null) {
 I = ";domain=" + c
 }
 document.cookie = i + "=" + escape(l) + O + I
 },
 readStyle: function(I, l) {
 if (I.style[l]) {
 return I.style[l]
 } else if (I.currentStyle) {
 return I.currentStyle[l]
 } else if (document.defaultView && document.defaultView.getComputedStyle) {
 var i = document.defaultView.getComputedStyle(I, null);
 return i.getPropertyValue(l)
 } else {
 return null
 }
 }
};
//滚动图片构造函数
//UI&UE Dept. mengjia
//080623
function ScrollPic(scrollContId, arrLeftId, arrRightId, dotListId) {
 this.scrollContId = scrollContId;
 this.arrLeftId = arrLeftId;
 this.arrRightId = arrRightId;
 this.dotListId = dotListId;
 this.dotClassName = "dotItem";
 this.dotOnClassName = "dotItemOn";
 this.dotObjArr = [];
 this.pageWidth = 0;
 this.frameWidth = 0;
 this.speed = 10;
 this.space = 10;
 this.pageIndex = 0;
 this.autoPlay = true;
 this.autoPlayTime = 5;
 var _autoTimeObj, _scrollTimeObj, _state = "ready";
 this.stripDiv = document.createElement("DIV");
 this.listDiv01 = document.createElement("DIV");
 this.listDiv02 = document.createElement("DIV");
 if (!ScrollPic.childs) {
 ScrollPic.childs = []
 }
 this.ID = ScrollPic.childs.length;
 ScrollPic.childs.push(this);
 this.initialize = function() {
 if (!this.scrollContId) {
 throw new Error("必须指定scrollContId.");
 return
 }
 this.scrollContDiv = sina.$(this.scrollContId);
 if (!this.scrollContDiv) {
 throw new Error("scrollContId不是正确的对象.(scrollContId = \"" + this.scrollContId + "\")");
 return
 }
 this.scrollContDiv.style.width = this.frameWidth + "px";
 this.scrollContDiv.style.overflow = "hidden";
 this.listDiv01.innerHTML = this.listDiv02.innerHTML = this.scrollContDiv.innerHTML;
 this.scrollContDiv.innerHTML = "";
 this.scrollContDiv.appendChild(this.stripDiv);
 this.stripDiv.appendChild(this.listDiv01);
 this.stripDiv.appendChild(this.listDiv02);
 this.stripDiv.style.overflow = "hidden";
 this.stripDiv.style.zoom = "1";
 this.stripDiv.style.width = "32766px";
 this.listDiv01.style.cssFloat = "left";
 this.listDiv02.style.cssFloat = "left";
 sina.addEvent(this.scrollContDiv, "mouseover", Function("ScrollPic.childs[" + this.ID + "].stop()"));
 sina.addEvent(this.scrollContDiv, "mouseout", Function("ScrollPic.childs[" + this.ID + "].play()"));
 if (this.arrLeftId) {
 this.arrLeftObj = sina.$(this.arrLeftId);
 if (this.arrLeftObj) {
 sina.addEvent(this.arrLeftObj, "mousedown", Function("ScrollPic.childs[" + this.ID + "].rightMouseDown()"));
 sina.addEvent(this.arrLeftObj, "mouseup", Function("ScrollPic.childs[" + this.ID + "].rightEnd()"));
 sina.addEvent(this.arrLeftObj, "mouseout", Function("ScrollPic.childs[" + this.ID + "].rightEnd()"))
 }
 }
 if (this.arrRightId) {
 this.arrRightObj = sina.$(this.arrRightId);
 if (this.arrRightObj) {
 sina.addEvent(this.arrRightObj, "mousedown", Function("ScrollPic.childs[" + this.ID + "].leftMouseDown()"));
 sina.addEvent(this.arrRightObj, "mouseup", Function("ScrollPic.childs[" + this.ID + "].leftEnd()"));
 sina.addEvent(this.arrRightObj, "mouseout", Function("ScrollPic.childs[" + this.ID + "].leftEnd()"))
 }
 }
 if (this.dotListId) {
 this.dotListObj = sina.$(this.dotListId);
 if (this.dotListObj) {
 var pages = Math.round(this.listDiv01.offsetWidth / this.frameWidth + 0.4),
 i, tempObj;
 for (i = 0; i < pages; i++) {
 tempObj = document.createElement("span");
 this.dotListObj.appendChild(tempObj);
 this.dotObjArr.push(tempObj);
 if (i == this.pageIndex) {
 tempObj.className = this.dotClassName
 } else {
 tempObj.className = this.dotOnClassName
 }
 tempObj.title = "第" + (i + 1) + "页";
 sina.addEvent(tempObj, "click", Function("ScrollPic.childs[" + this.ID + "].pageTo(" + i + ")"))
 }
 }
 }
 if (this.autoPlay) {
 this.play()
 }
 };
 this.leftMouseDown = function() {
 if (_state != "ready") {
 return
 }
 _state = "floating";
 _scrollTimeObj = setInterval("ScrollPic.childs[" + this.ID + "].moveLeft()", this.speed)
 };
 this.rightMouseDown = function() {
 if (_state != "ready") {
 return
 }
 _state = "floating";
 _scrollTimeObj = setInterval("ScrollPic.childs[" + this.ID + "].moveRight()", this.speed)
 };
 this.moveLeft = function() {
 if (this.scrollContDiv.scrollLeft + this.space >= this.listDiv01.scrollWidth) {
 this.scrollContDiv.scrollLeft = this.scrollContDiv.scrollLeft + this.space - this.listDiv01.scrollWidth
 } else {
 this.scrollContDiv.scrollLeft += this.space
 }
 this.accountPageIndex()
 };
 this.moveRight = function() {
 if (this.scrollContDiv.scrollLeft - this.space <= 0) {
 this.scrollContDiv.scrollLeft = this.listDiv01.scrollWidth + this.scrollContDiv.scrollLeft - this.space
 } else {
 this.scrollContDiv.scrollLeft -= this.space
 }
 this.accountPageIndex()
 };
 this.leftEnd = function() {
 if (_state != "floating") {
 return
 }
 _state = "stoping";
 clearInterval(_scrollTimeObj);
 var fill = this.pageWidth - this.scrollContDiv.scrollLeft % this.pageWidth;
 this.move(fill)
 };
 this.rightEnd = function() {
 if (_state != "floating") {
 return
 }
 _state = "stoping";
 clearInterval(_scrollTimeObj);
 var fill = -this.scrollContDiv.scrollLeft % this.pageWidth;
 this.move(fill)
 };
 this.move = function(num, quick) {
 var thisMove = num / 5;
 if (!quick) {
 if (thisMove > this.space) {
 thisMove = this.space
 }
 if (thisMove < -this.space) {
 thisMove = -this.space
 }
 }
 if (Math.abs(thisMove) < 1 && thisMove != 0) {
 thisMove = thisMove >= 0 ? 1 : -1
 } else {
 thisMove = Math.round(thisMove)
 }
 var temp = this.scrollContDiv.scrollLeft + thisMove;
 if (thisMove > 0) {
 if (this.scrollContDiv.scrollLeft + thisMove >= this.listDiv01.scrollWidth) {
 this.scrollContDiv.scrollLeft = this.scrollContDiv.scrollLeft + thisMove - this.listDiv01.scrollWidth
 } else {
 this.scrollContDiv.scrollLeft += thisMove
 }
 } else {
 if (this.scrollContDiv.scrollLeft - thisMove <= 0) {
 this.scrollContDiv.scrollLeft = this.listDiv01.scrollWidth + this.scrollContDiv.scrollLeft - thisMove
 } else {
 this.scrollContDiv.scrollLeft += thisMove
 }
 }
 num -= thisMove;
 if (Math.abs(num) == 0) {
 _state = "ready";
 if (this.autoPlay) {
 this.play()
 }
 this.accountPageIndex();
 return
 } else {
 this.accountPageIndex();
 setTimeout("ScrollPic.childs[" + this.ID + "].move(" + num + "," + quick + ")", this.speed)
 }
 };
 this.next = function() {
 if (_state != "ready") {
 return
 }
 _state = "stoping";
 this.move(this.pageWidth, true)
 };
 this.play = function() {
 if (!this.autoPlay) {
 return
 }
 clearInterval(_autoTimeObj);
 _autoTimeObj = setInterval("ScrollPic.childs[" + this.ID + "].next()", this.autoPlayTime * 1000)
 };
 this.stop = function() {
 clearInterval(_autoTimeObj)
 };
 this.pageTo = function(num) {
 if (_state != "ready") {
 return
 }
 _state = "stoping";
 var fill = num * this.frameWidth - this.scrollContDiv.scrollLeft;
 this.move(fill, true)
 };
 this.accountPageIndex = function() {
 this.pageIndex = Math.round(this.scrollContDiv.scrollLeft / this.frameWidth);
 if (this.pageIndex > Math.round(this.listDiv01.offsetWidth / this.frameWidth + 0.4) - 1) {
 this.pageIndex = 0
 }
 var i;
 for (i = 0; i < this.dotObjArr.length; i++) {
 if (i == this.pageIndex) {
 this.dotObjArr[i].className = this.dotClassName
 } else {
 this.dotObjArr[i].className = this.dotOnClassName
 }
 }
 }
}