本文实例讲述了javascript实现图片左右滚动效果。分享给大家供大家参考，具体如下：
html代码：
图片滚动
scrollPic.js 代码：
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.$(this.scrollContId);
if (!this.scrollContDiv) {
throw new Error("scrollContId不是正确的对象.(scrollContId = \"" + this.scrollContId + "\")");
return
};
this.scrollContDiv.style.width = this.frameWidth + "px";
this.scrollContDiv.style.overflow = "hidden";
this.listDiv01.innerHTML = this.listDiv02.innerHTML = this.scrollContDiv.innerHTML;
this.scrollContDiv.innerHTML = "";
this.scrollContDiv.appendChild(this.stripDiv);
this.stripDiv.appendChild(this.listDiv01);
this.stripDiv.appendChild(this.listDiv02);
this.stripDiv.style.overflow = "hidden";
this.stripDiv.style.zoom = "1";
this.stripDiv.style.width = "32766px";
if(-[1,]){
this.listDiv01.style.cssFloat = "left";
this.listDiv02.style.cssFloat = "left";
}else{
this.listDiv01.style.styleFloat = "left";
this.listDiv02.style.styleFloat = "left";
}
sina.addEvent(this.scrollContDiv, "mouseover", Function("ScrollPic.childs[" + this.ID + "].stop()"));
sina.addEvent(this.scrollContDiv, "mouseout", Function("ScrollPic.childs[" + this.ID + "].play()"));
if (this.arrLeftId) {
this.arrLeftObj = sina.$(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
}
}
}
};参数说明：
var scrollPic = new ScrollPic(); //定义变量，并初始化方法
scrollContId //滚动容器的ID
arrLeftId //左按钮ID
arrRightId //右按钮ID
frameWidth //显示框宽度
pageWidth //翻页宽度
speed //移动速度(单位毫秒，越小越快)
space //每次移动像素(单位px，越大越快)
autoPlay //自动播放
autoPlayTime //自动播放间隔时间(秒)
initialize() //初始化
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