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【javascript】图片左右滚动（可自动，有左右按钮）

html代码：

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"/>
    <meta name="renderer" content="webkit"/>
    <meta name="keywords" content=""/>
    <meta name="description" content=""/>
    <title>图片滚动</title>
    <style>
    *{margin:0;padding:0;}
    ul{list-style:none;}
    img{border:0;}
    .scroll{width:358px;height:63px;}
    .scroll_left{width:23px;height:63px;background:url(images/btn_left.jpg) no-repeat;float:left;}
    .scroll_right{width:23px;height:63px;background:url(images/btn_right.jpg) left no-repeat;float:left;}
    .pic{width:312px;height:73px;float:left;}
    .pic ul{display:block;}
    .pic li{float:left;display:inline;width:104px;text-align:center;}
    </style>
</head>
<body>
<div style="margin:100px auto;358px;">
    <div class="scroll">
        <div class="scroll_left" id="LeftArr"></div>
        <div class="pic" id="scrollPic">
        <ul>
            <li><a href="#" target="_blank" title=""><img src="images/pic01.png" width="100" height="63" alt="" /></a></li>
            <li><a href="#" target="_blank" title=""><img src="images/pic02.jpg" width="100" height="63" alt="" /></a></li>
            <li><a href="#" target="_blank" title=""><img src="images/pic03.jpg" width="100" height="63" alt="" /></a></li>
            <li><a href="#" target="_blank" title=""><img src="images/pic04.jpg" width="100" height="63" alt="" /></a></li>
            <li><a href="#" target="_blank" title=""><img src="images/pic05.jpg" width="100" height="63" alt="" /></a></li>
            <li><a href="#" target="_blank" title=""><img src="images/pic06.jpg" width="100" height="63" alt="" /></a></li>
        </ul>
        </div>
        <div class="scroll_right" id="RightArr"></div>
    </div>
</div>
</body>
</html>
<script src="scrollPic.js"></script>
<script>
window.onload = function(){
    scrollPic();
}
function scrollPic() {
    var scrollPic = new ScrollPic();
    scrollPic.scrollContId   = "scrollPic"; //内容容器ID
    scrollPic.arrLeftId      = "LeftArr";//左箭头ID
    scrollPic.arrRightId     = "RightArr"; //右箭头ID

    scrollPic.frameWidth     = 312;//显示框宽度
    scrollPic.pageWidth      = 104; //翻页宽度

    scrollPic.speed          = 10; //移动速度(单位毫秒，越小越快)
    scrollPic.space          = 10; //每次移动像素(单位px，越大越快)
    scrollPic.autoPlay       = true; //自动播放
    scrollPic.autoPlayTime   = 3; //自动播放间隔时间(秒)

    scrollPic.initialize(); //初始化
}
</script>

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
            }
        }
    }
};

View Code

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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原文地址：https://www.cnblogs.com/yjzhu/p/2782418.html