完美实现八种js焦点轮播图（上篇）

2019-11-20 09:27:28

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来源：转载

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本文分为上下篇为大家分享了js焦点轮播图八种经典效果，供大家参考，具体内容如下

基本布局：

<div id="box"> <ul id="ul">  <li style='display:block;'><img src="images/1.jpg" alt=""></li>  <li><img src="images/2.jpg" alt=""></li>  <li><img src="images/3.jpg" alt=""></li>  <li><img src="images/4.jpg" alt=""></li>  <li><img src="images/5.jpg" alt=""></li> </ul> <ol id='ol'>  <li class='active'>1</li>  <li>2</li>  <li>3</li>  <li>4</li>  <li>5</li> </ol> </div>

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1.普通焦点图

window.onload=function(){   var oUl=document.getElementById('ul');   var aLi_u=oUl.getElementsByTagName('li');   var oOl=document.getElementById('ol');   var aLi_o=oOl.getElementsByTagName('li');   for(var i=0;i<aLi_o.length;i++){    aLi_o[i].index=i;    aLi_o[i].onmouseover=function(){     for(var i=0;i<aLi_o.length;i++){      aLi_o[i].className='';      aLi_u[i].style.display='none';     }     this.className='active';     // console.log(aLi_o[this.index]);     aLi_u[this.index].style.display='block';    }   }  }

效果图：图略

2.淡入淡出效果

var oUl=document.getElementById('ul');var aLi_u=oUl.getElementsByTagName('li');var oOl=document.getElementById('ol');var aLi_o=oOl.getElementsByTagName('li');for(var i=0;i<aLi_o.length;i++){ aLi_o[i].index=i; aLi_o[i].onmouseover=function(){   for(var i=0;i<aLi_o.length;i++){    aLi_o[i].className='';    aLi_u[i].style.display='none';    aLi_u[i].style.filter='alpha(opacity=0)';    aLi_u[i].style.opacity=0;   }   this.className='active';   aLi_u[this.index].style.display='block';   startMove(aLi_u[this.index],{opacity:100}); };}

效果图：

3.向上滚动效果：

var oUl=document.getElementById('ul');var aLi_u=oUl.getElementsByTagName('li');var oOl=document.getElementById('ol');var aLi_o=oOl.getElementsByTagName('li');var LiHeight=aLi_u[0].offsetHeight;for(var i=0;i<aLi_o.length;i++){ aLi_o[i].index=i; aLi_o[i].onmouseover=function(){  for(var i=0;i<aLi_o.length;i++){   aLi_o[i].className='';   this.className='active';   startMove(oUl,{top:-this.index*LiHeight});  } };}

效果图：

4.定时上下滚动：

window.onload=function(){ var oBox=document.getElementById('box'); var oUl=document.getElementById('ul'); var aLi_u=oUl.getElementsByTagName('li'); var oOl=document.getElementById('ol'); var aLi_o=oOl.getElementsByTagName('li'); var LiHeight=aLi_u[0].offsetHeight; var iNow=0;//当前索引 var timer=null;//定时器 for(var i=0;i<aLi_o.length;i++){  aLi_o[i].index=i;  aLi_o[i].onmouseover=function(){   for(var i=0;i<aLi_o.length;i++){    aLi_o[i].className='';    this.className='active';    //建立关系：很重要    iNow=this.index;    startMove(oUl,{top:-this.index*LiHeight});   }  }; //开定时器 timer=setInterval(toRun,2000); oBox.onmouseover=function(){  clearInterval(timer); }; oBox.onmouseout=function(){  timer=setInterval(toRun,2000); }; //定时函数 function toRun(){  if(iNow==aLi_o.length-1){   iNow=0;  }else{   iNow++;  }  for(var i=0;i<aLi_o.length;i++){   aLi_o[i].className='';  }  aLi_o[iNow].className='active';  startMove(oUl,{top:-iNow*LiHeight}); }};

效果图：