js实现图片点击左右轮播

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.rentStyle) {      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    }  }};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      }    }  }};

<!DOCTYPE html><html>  <head>    <meta charset="utf-8">    <title>实现滚动轮播的效果</title>    <style type="text/css">      .nav {        width: 1100px;        height: 160px;        /*border: 1px solid red;*/        margin-left: 140px;        position: relative;        cursor: pointer;        margin-top: 15px;        overflow: hidden;        border: 1px solid red      }      .nav #nav-all {        width: auto;        height: 160px;        position: absolute;        left: -30px;      }      .nav .nav-i {        width: 194px;        height: 158px;        background: #fff;        border: 1px solid #d8d8d8;        float: left;        margin-left: 30px;      }      .nav .nav-img {        text-align: center;        padding-top: 50px;      }      .nav .nav-name {        width: 192px;        height: 30px;        background: #f2f2f2;        margin-top: 33px;        line-height: 30px;      }      .nav .nav-name a {        font-size: 16px;        font-family: '微软雅黑';        padding-left: 10px;        cursor: pointer;      }      .nav .nav-name a:hover {        color: #4a7abe;      }      #last {        position: absolute;        left: 0;        top: 50px;      }      #next {        position: absolute;        right: 0;        top: 50px;      }      .last-next {        /*display: none;*/                cursor: pointer;      }    </style>  </head>  <body>    <div class="nav" id="nav">      <div id="nav-all">        <div class="nav-i">          <div class="nav-img">            <img src="img/icon1.png" />          </div>          <div class="nav-name"><a>BI系统1</a>          </div>        </div>        <div class="nav-i">          <div class="nav-img">            <img src="img/icon1.png" />          </div>          <div class="nav-name"><a>BI系统2</a>          </div>        </div>        <div class="nav-i">          <div class="nav-img">            <img src="img/icon1.png" />          </div>          <div class="nav-name"><a>BI系统3</a>          </div>        </div>        <div class="nav-i">          <div class="nav-img">            <img src="img/icon1.png" />          </div>          <div class="nav-name"><a>BI系统4</a>          </div>        </div>        <div class="nav-i">          <div class="nav-img">            <img src="img/icon1.png" />          </div>          <div class="nav-name"><a>BI系统5</a>          </div>        </div>        <div class="nav-i">          <div class="nav-img">            <img src="img/icon1.png" />          </div>          <div class="nav-name"><a>BI系统6</a>          </div>        </div>        <div class="nav-i">          <div class="nav-img">            <img src="img/icon1.png" />          </div>          <div class="nav-name"><a>BI系统7</a>          </div>        </div>      </div>      <a class="last-next" id="last">        <img src="img/last.png" />      </a>      <a class="last-next" id="next">        <img src="img/next.png" />      </a>    </div>    <script src="play.js" type="text/javascript" charset="utf-8"></script>    <script type="text/javascript">      var scrollPic_02 = new ScrollPic();      scrollPic_02.scrollContId = "nav-all";//存放所有轮播元素的div      scrollPic_02.arrLeftId = "last"; //左箭头ID      scrollPic_02.arrRightId = "next"; //右箭头ID      scrollPic_02.frameWidth = 1102; //显示框宽    sfdasdfakfl;jlkajka;d度      scrollPic_02.pageWidth = 226; //翻页宽度      scrollPic_02.speed = 10; //移动速度(毫秒，越小越快)      scrollPic_02.space = 20; //每次移动像素(单位px，越大越快)      scrollPic_02.autoPlay = true; //自动播放:true|false      scrollPic_02.autoPlayTime = 2; //自动播放间隔时间(秒)      scrollPic_02.initialize(); //初始化       //--><!]]>    </script>  </body></html>