JS implementation method of Taobao slideshow effect_javascript skills
Implementation ideas:
1. The for loop adds click events to the number buttons.
2. The for loop first clears the button's style, and then sets the current style.
3. Add a custom attribute index aBtn[i].index=i aBtn[2]=2 to each button. If you want the second button to correspond to the second picture, use a motion frame to change the UL of the large picture each time. Move -150px because the image height is 150px. If you move to the nth picture, it is -150*n.
4. Define the variable now for automatic playback. Assign the current image to now now=this.index.
5. Define the autoplay function. now Next picture, if judgment, when reaching the last picture, set now to 0, which is the first picture. if(now==aBtn.length)
6. Define a timer and call the autoplay function every 2 seconds.
7. Clear the timer when the mouse points to the picture.
8. The timer starts when the mouse leaves the picture.
<script><BR> window.onload=function ()<BR> {<BR> var oDiv=document.getElementById('play');<BR> var aBtn=oDiv.getElementsByTagName('ol')[0].getElementsByTagName('li');<BR> var oUl=oDiv.getElementsByTagName('ul')[0];<BR> var now=0;<br><br> for(var i=0;i<aBtn.length;i )<BR> {<BR> aBtn[i].index=i;<BR> aBtn[i].onmouseover=function()<BR> {<BR> now=this.index; //The current value is assigned to now<BR> tab();<BR> }<BR> };<br><br> function tab()<BR> { for(var i=0;i<aBtn.length;i) <BR> {<BR> aBtn[i ; -150*now}); //Use the motion framework to set UL's TOP to the current number*-150. The third picture is 2*-150<BR> };<BR><BR> function next()<BR> One piece<BR> }<br> tab(); //Pull the picture back to the first one and continue moving<br> };<BR><BR> var timer=setInterval(next,2000); //2 seconds Automatically switch pictures<BR><BR> oDiv.onmouseover=function()<BR> {<BR> clearInterval(timer); //Clear timer<BR> };<BR><br> oDiv.onmouseout=function( ; <br>Full code:<br><br><BR><BR><BR>Copy code<br><br><BR> The code is as follows:<BR><div class="codebody" id="code52143"><BR><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><BR> <html xmlns="http://www.w3.org/1999/xhtml"><BR> <head><BR> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><BR> <title>淘宝幻灯片上下滑动效果 —— www.zhinengshe.com —— 智能课堂<BR> <link href="css.css" rel="stylesheet" type="text/css" /><BR> <script src="baseCommon.js"></script>
<script><BR> window.onload=function()<BR> {<BR> var oDiv=document.getElementById('play');<BR> var aBtn=oDiv.getElementsByTagName('ol')[0].getElementsByTagName('li');<BR> var oUl=oDiv.getElementsByTagName('ul')[0];<BR> var now=0;<br><br> for(var i=0;i<aBtn.length;i )<BR> {<BR> aBtn[i].index=i;<BR> aBtn[i].onmouseover=function()<BR> {<BR> now=this.index; //当前值赋给now<BR> tab();<BR> }<BR> };<br><br> function tab()<BR> { <BR> for(var i=0;i<aBtn.length;i ) <BR> {<BR> aBtn[i].className=''; //把所有按钮的样式清空<BR> };<BR> aBtn[now].className='active'; //当前按钮样式设置<BR> startMove(oUl,{top:-150*now}); //用运动框架把UL的TOP设置为当前个数*-150，第三张图片就是2*-150<BR> };<br><br> function next()<BR> {<BR> now ; //切换图片<BR> if(now==aBtn.length) //如果到了最后一张图片<BR> {<BR> now=0; // 把图片拉回第一张<BR> }<BR> tab(); //把图片拉回第一张后继续运动<BR> };<br><br> var timer=setInterval(next,2000); //2秒自动切换图片<br><br> oDiv.onmouseover=function()<BR> {<BR> clearInterval(timer); //清除定时器<BR> };<br><br> oDiv.onmouseout=function()<BR> {<BR> timer=setInterval(next,2000); //开启定时器<BR> };<BR> };<BR> </script>
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