js如何制作图片轮播

1、编写基本的样 <div class="slide" 坡纠课柩id="slide"稆糨孝汶;> <div class="img-div"> <img src="img/banner1.png" title="图片1"/> <img src="img/banner2.png" title="图片2"/> <img src="img/banner3.png" title="图片3"/> </div> <div class="slide-btn"> <a href="#" class="hover">●</a> <a href="#">●</a> <a href="#">●</a> </div> </div>

2、获取文档对象以id获取文档对象 $id:function(id){return document.getElementById(id);},//以标签名获取文档对象 $tag:function(tagName,obj){return (obj ?obj : document).getElementsByTagName(tagName); },以class获取文档对象$c：function (claN,obj){ var tag = $tag('*'),reg = new RegExp('(^|\\s)'+claN+'(\\s|$)'),arr=[]; for(var i=0;i<tag.length;i++){ if (reg.test(tag[i].className)){ arr.push(tag[i]); } } return arr;}

3、添加和移除class $add:function(obj,claN){ reg = new RegExp('(^|\\s)'+claN+'(\\s|$)'); if (!reg.test(obj.className)){ obj.className += ' '+claN; } },//移除classs $remve:function(obj,claN){var cla=obj.className,reg="/\\s*"+claN+"\\b/g";obj.className=cla?cla.replace(eval(reg),''):''},

4、css获取方法 css:function(obj,attr,value){ if(value){ obj.style[attr] = value; }else{ return typeof window.getComputedStyle != 'undefined' ? window.getComputedStyle(obj,null)[attr] : obj.currentStyle[attr]; } },

5、常用的easing方法 easing ={ linear:function(t,b,c,d){return c*t/d + b;}, swing:function(t,b,c,d) {return -c/2 * (Math.cos(Math.PI*t/d) - 1) + b;}, easeIn:function(t,b,c,d){return c*(t/=d)*t*t*t + b;}, easeOut:function(t,b,c,d){return -c*((t=t/d-1)*t*t*t - 1) + b;}, easeInOut:function(t,b,c,d){return ((t/=d/2) < 1)?(c/2*t*t*t*t + b):(-c/2*((t-=2)*t*t*t - 2) + b);} }

6、初始化config:{ index:0, auto:true, direct:'left' //滚动方向，left,top, }, init:function(){ this.slide = this.$id('slide'); this.img_div = this.$c('img-div')[0], this.slide_btn = this.$tag('a',this.$c('slide-btn')[0]); this.img_arr = this.$tag('img',this.img_div); if(this.config.auto) this.play();//是否自动播放 this.hover();//绑定导航悬停切换。即mouseover,mouseout事件 },

7、动画效果 animate:function(obj,attr,val){ var d = 1000;//动画时间一秒完成。 if(obj[attr+'timer']) clearInterval(obj[attr+'timer']); var start = parseInt(zBase.css(obj,attr));//动画开始位置 //space = 动画结束位置-动画开始位置，即动画要运动的距离。 var space = val- start,st=(new Date).getTime(),m=space>0? 'ceil':'floor'; obj[attr+'timer'] = setInterval(function(){ var t=(new Date).getTime()-st;//表示运行了多少时间， if (t < d){//如果运行时间小于动画时间 zBase.css(obj,attr,Math[m](zBase.easing['easeOut'](t,start,space,d)) +'px'); }else{ clearInterval(obj[attr+'timer']); zBase.css(obj,attr,val+'px'); } },20); },

8、导航切换 hover:function(){ for(var i=0;i<this.slid髫潋啜缅e_btn.length;i++){ this.slide_btn[i].index = i; this.slide_btn[i].onmouseover = function(){ if(zBase.slide.timer) clearInterval(zBase.slide.timer); zBase.config.index =this.index; for(var j=0;j<zBase.slide_btn.length;j++){ zBase.$remve(zBase.slide_btn[j],'hover') ; } zBase.$add(zBase.slide_btn[zBase.config.index],'hover'); zBase.animate(zBase.img_div,zBase.config.direct,-zBase.config.index*500);//500是轮播器的大小，当前索引乘以500，再取负，就是轮播器要滚动f到的位置。 } this.slide_btn[i].onmouseout = function(){ zBase.play(); } } },

9、自动播放 play:function(){ this.slide.timer = setInterval(function(){ zBase.config.index++; if(zBase.config.index>=zBase.img_arr.length) zBase.config.index=0; zBase.animate(zBase.img_div,zBase.config.direct,-zBase.config.index*500); for(var j=0;j<zBase.slide_btn.length;j++){ zBase.$remve(zBase.slide_btn[j],'hover') ; } zBase.$add(zBase.slide_btn[zBase.config.index],'hover'); },3000) },

10、调用代码zBase.init();