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：
/p>
"/TR/xhtml1/DTD/xhtml1-transitional.dtd">
纯JS幻灯版
*{ 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);}
var box =new PPTBox();
box.width = 1000; //宽度
box.height = 226;//高度
box.autoplayer = 3;//自动播放间隔时间
//box.add({"url":"图片地址","title":"悬浮标题","href":"链接地址"})
box.add({"url":"styles/images/fck_04.jpg","href":"###","title":"悬浮提示标题1"});
box.add({"url":"styles/images/fck_04.jpg","href":"###","title":"悬浮提示标题1"});
box.add({"url":"styles/images/fck_04.jpg","href":"###","title":"悬浮提示标题1"});
box.add({"url":"styles/images/fck_04.jpg","href":"###","title":"悬浮提示标题1"});
box.show();
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
var parame = this._box[i];
flashbox += this.flashHTML(parame.url,this.width,this.height,i);
imageHTML ="
}
this._$(this.uid+"_flashbox").innerHTML = flashbox;
this._$(this.uid+"_imagebox").innerHTML = imageHTML;
},
_play : function(){
clearInterval(this._autoplay);
var idx = this._curIndex+1;
if(idx>=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 = "
+ "codebase='/pub/shockwave/cabs/flash/swflash.cab#version=7,0,19,0' width='"+width+"' height='"+height+"'>"
+ ""
+ ""
+ ""
+ "
+" type='application/x-shockwave-flash' width="+width+" height='"+height+"'>
"
+"
";
} 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：
希望本文所述对大家JavaScript程序设计有所帮助。
