JS实现的幻灯片切换显示效果

本文实例讲述了JS实现的幻灯片切换显示效果。分享给大家供大家参考，具体如下：

html：

*{ margin:0; padding:0;}
#banner {width:1000px;text-align:left; background:#fff; margin:0 auto;}
#banner img{ display:block; float:left;}
.mainbox{ overflow:hidden; position:relative;}
.flashbox{ overflow:hidden; position:relative;}
.imagebox{ text-align:right;position:relative;z-index:999;}
.bitdiv{display:inline-block;width:18px;height:18px;margin:0 10px 10px 0px;cursor:pointer;float:right;}
.defimg{ background:url(styles/images/ppt_icon2.png);}
.curimg{background:url(styles/images/ppt_icon1.png);}





  

js：

function PPTBox()
{
  this.uid = PPTBoxHelper.getId();
  PPTBoxHelper.instance[this.uid] = this;
  this._$ = function(id){return document.getElementById(id);};
  this.width = 400;//宽度
  this.height = 300;//高度
  this.picWidth = 15;//小图宽度
  this.picHeight = 12;//小图高度
  this.autoplayer = 4;//自动播放间隔（秒）
  this.target = "_blank";
  this._box = [];
  this._curIndex = 0;
}
PPTBox.prototype =
{
  _createMainBox : function (){
    var flashBoxWidth = this.width * this._box.length;
    var html="";
    html += "";
    html += "";
    html += "";
    document.write(html);
  },
  _init : function (){
    var picstyle= "";
    var eventstr = "PPTBoxHelper.instance['"+this.uid+"']";
    var imageHTML="";
    var flashbox = "";
    for(var i=0;i=this._box.length){idx=0;}
    this.changeIndex(idx);
    var eventstr = "PPTBoxHelper.instance['"+this.uid+"']._play()";
    this._autoplay = setInterval(eventstr,this.autoplayer*1000);
  },
  flashHTML : function(url,width,height,idx) {
    var isFlash = url.substring(url.lastIndexOf('.')+1).toLowerCase()=="swf";
    var html = "";
    if(isFlash){
      html = "";
    } else {
      var eventstr = "PPTBoxHelper.instance['"+this.uid+"']";
      var style = "";
      if(this._box[idx].href){
 style = "cursor:pointer"
      }
      html="";
    }
    return html;
  },
  changeIndex : function(idx){
    var parame = this._box[idx];
    moveElement(this.uid+"_flashbox",-(idx*this.width),1);
    var imgs = this._$(this.uid+"_imagebox").getElementsByTagName("div");
    imgs[this._box.length-1-this._curIndex].className = "bitdiv defimg";
    imgs[this._box.length-1-idx].className = "bitdiv curimg";
    this._curIndex = idx;
  },
  mouseoverPic:function(idx){
    this.changeIndex(idx);
    if(this.autoplayer>0){
      clearInterval(this._autoplay);
      var eventstr = "PPTBoxHelper.instance['"+this.uid+"']._play()";
      this._autoplay = setInterval(eventstr,this.autoplayer*1000);
    }
  },
  clickPic:function(idx){
    var parame = this._box[idx];
    if(parame.href&¶me.href!=""){
      window.open(parame.href,this.target);
    }
  },
  add:function (imgParam){
    this._box[this._box.length] = imgParam;
  },
  show : function () {
    this._createMainBox();
    this._init();
    if(this.autoplayer>0){
      var eventstr = "PPTBoxHelper.instance['"+this.uid+"']._play()";
      this._autoplay = setInterval(eventstr,this.autoplayer*1000);
    }
  }
}
var PPTBoxHelper =
{
  count: 0,
  instance: {},
  getId: function() { return '_ppt_box-' + (this.count++); }
};
function moveElement(elementID,final_x,interval) {
 if (!document.getElementById) return false;
 if (!document.getElementById(elementID)) return false;
 var elem = document.getElementById(elementID);
 if (elem.movement) {
  clearTimeout(elem.movement);
 }
 if (!elem.style.left) {
  elem.style.left = "0px";
 }
 var xpos = parseInt(elem.style.left);
 if (xpos == final_x ) {
    return true;
 }
 if (xpos < final_x) {
  var dist = Math.ceil((final_x - xpos)/5);
  xpos = xpos + dist;
 }
 if (xpos > final_x) {
  var dist = Math.ceil((xpos - final_x)/5);
  xpos = xpos - dist;
 }
 elem.style.left = xpos + "px";
 var repeat = "moveElement('"+elementID+"',"+final_x+","+interval+")";
 elem.movement = setTimeout(repeat,interval);
}

效果图如下：

更多关于Javascript相关内容感兴趣的读者可查看本站专题：《Javascript切换特效与技巧总结》、《Javascript查找算法技巧总结》、《Javascript动画特效与技巧汇总》、《Javascript错误与调试技巧总结》、《Javascript数据结构与算法技巧总结》及《Javascript数学运算用法总结》

希望本文所述对大家Javascript程序设计有所帮助。