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js implements image carousel album with transition gradient effect (compatible with IE, ff)_javascript skills

WBOYOriginal: 2016-05-16 15:19:241466browse

This article introduces the example of js to implement picture carousel album, with transition gradient effect. It is shared with everyone for your reference. The specific content is as follows

The idea is very simple, use 2 attributes to save the current picture and the previous picture, and use 2 timers to control the transparency and the current transition picture respectively.

<HTML> 
<HEAD> 
<TITLE></TITLE> 
</HEAD> 
<style> 
#cnt{width:100%;height:80%;} 
.ctrl{text-align:center;border:1px solid gray;font-size:12px;cursor:pointer;} 
</style> 
<script defer='defer'> 
<!-- 
  var curOpac = 0; 
  var filterTimer; 
  var isIE = /internet explorer/i.test(window.navigator.appName); 
   
  function MyScroll(cnt, control){ 
    this.data = []; // 存放图片路径 
    this.interval = 3000; // 过渡一次的间隔时间(过渡时间+图片显示时间) 
    this.timer; // 定时器：控制当前显示的图片 
    this.container = cnt; 
    this.curFrame = 0; 
    this.oldFrame = 0; 
    this.controls = control; // 按钮集合 
    Global = this;     // 获取对象的指针 
 
    this.run = function(){ 
      this.timer = window.setInterval("Global.showFrame()", this.interval); 
    } 
     
    // 按钮的处理程序 
    this.go = function(i){ 
      curOpac = 0; // 透明度归0 
      this.curFrame = i; // 当前要过渡的图片 
      this.stop(); // 清空计时器 
      this.showFrame(); // 当前图片过渡 
      this.run(); // 循环播放 
    } 
     
    this.stop = function(){ 
      window.clearInterval(this.timer); 
      window.clearInterval(filterTimer); 
    } 
 
    this.showFrame = function(){ 
      // 设置当前按钮样式 
      this.controls[this.oldFrame].style.backgroundColor = "white"; 
      this.controls[this.curFrame].style.backgroundColor = "gray"; 
 
      if(isIE) this.container.style.filter = "alpha(opacity=0)"; 
      else this.container.style.cssText = "-moz-opacity:0"; 
 
      this.container.innerHTML = this.data[this.curFrame]; 
      filterTimer = window.setInterval("blend()", 100); 
       
      this.oldFrame = this.curFrame; 
      this.curFrame ++; 
      if(this.curFrame == this.data.length){ 
        this.curFrame = 0; 
      }       
    } 
  } 
   // 增加透明度 
  function blend(){ 
    curOpac+=10; 
    if(isIE) Global.container.style.filter='alpha(opacity=' + curOpac + ')'; 
    else Global.container.style.cssText = "-moz-opacity:" + curOpac/100.0; 
 
    if(curOpac == 100){ 
      curOpac = 0; 
      window.clearInterval(filterTimer); 
    } 
  } 
  //开始 
   
  function startIt(){ 
    var imgArr = []; 
    // 创建4个图片对象保存图片路径 
    for(var i=0;i<4;i++){ 
      imgArr[i] = new Image(); 
      imgArr[i].src = "images/banner" + (i + 1) + ".jpg"; 
    } 
     
    var controlArr = $("mainTb").getElementsByTagName("span"); 
    for(var i=0;i<controlArr.length;i++){ 
      controlArr[i].tag = i; 
      controlArr[i].onclick = function(){ 
        myScroll.go(this.tag); 
      } 
    } 
 
    var myScroll = new MyScroll($("cnt"), controlArr); 
    myScroll.data.push("<img src='" + imgArr[0].src + "'>"); 
    myScroll.data.push("<img src='" + imgArr[1].src + "'>"); 
    myScroll.data.push("<img src='" + imgArr[2].src + "'>"); 
    myScroll.data.push("<img src='" + imgArr[3].src + "'>"); 
     
    myScroll.go(0); 
  } 
   
  window.onload = startIt; 
 
  function $(id){ return document.getElementById(id);} 
//--> 
</script> 
<BODY> 
<table width="300" height="100" id="mainTb"> 
  <tr> 
  <th rowspan="4"><div id="cnt"> </div></td> 
  <td width="15"><span class="ctrl"> 1 </span></td> 
  </tr> 
  <tr> 
  <td><span class="ctrl"> 2 </span></td> 
  </tr> 
  <tr> 
  <td><span class="ctrl"> 3 </span></td> 
  </tr> 
  <tr> 
  <td><span class="ctrl"> 4 </span></td> 
  </tr> 
</table> 
</BODY> 
</HTML>

The above is the entire content of this article. I hope it will be helpful to everyone in learning javascript programming.

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