How to achieve fade-in and fade-out effect in js_javascript skills

The fade in and fade out effect is often used in daily projects. Unfortunately, native JS does not have a similar method, and sometimes small pages are not worth introducing a jQuery library, so I wrote one myself. It has been encapsulated and is useful. Friends, you can use it directly. There is also a method for setting element transparency in the code. It is set according to IE rules (0~100). If it is changed to the standard setting method (0.00~1.00), please consider floating point to accurately express the difference when using it below.

Parameter description:
Both fadeIn() and fadeOut() have three parameters. The first one is event, which is required; the second one is fade speed, which is a positive integer. You can weigh the size by yourself. It is optional. Parameter; the third one is to specify the transparency value to fade in and out to (similar to fadeTo() in jQuery), a positive integer value from 0 to 100, which is also an optional parameter.
Key code:

 //淡入效果(含淡入到指定透明度) 
 function fadeIn(elem, speed, opacity){ 
  /* 
   * 参数说明 
   * elem==>需要淡入的元素 
   * speed==>淡入速度,正整数(可选) 
   * opacity==>淡入到指定的透明度,0~100(可选) 
   */ 
  speedspeed = speed || 20; 
  opacityopacity = opacity || 100; 
  //显示元素,并将元素值为0透明度(不可见) 
  elem.style.display = 'block'; 
  iBase.SetOpacity(elem, 0); 
  //初始化透明度变化值为0 
  var val = 0; 
  //循环将透明值以5递增,即淡入效果 
  (function(){ 
   iBase.SetOpacity(elem, val); 
   val += 5; 
   if (val <= opacity) { 
    setTimeout(arguments.callee, speed) 
   } 
  })(); 
 } 
  
 //淡出效果(含淡出到指定透明度) 
 function fadeOut(elem, speed, opacity){ 
  /* 
   * 参数说明 
   * elem==>需要淡入的元素 
   * speed==>淡入速度,正整数(可选) 
   * opacity==>淡入到指定的透明度,0~100(可选) 
   */ 
  speedspeed = speed || 20; 
  opacityopacity = opacity || 0; 
  //初始化透明度变化值为0 
  var val = 100; 
  //循环将透明值以5递减,即淡出效果 
  (function(){ 
   iBase.SetOpacity(elem, val); 
   val -= 5; 
   if (val >= opacity) { 
    setTimeout(arguments.callee, speed); 
   }else if (val < 0) { 
    //元素透明度为0后隐藏元素 
    elem.style.display = 'none'; 
   } 
  })(); 
 } 

Rendering:

Core code, you can

copy the code directly to see the effect

 
 
 
 
 
 
<script> 
window.onload = function(){ 
 //底层共用 
 var iBase = { 
  Id: function(name){ 
   return document.getElementById(name); 
  }, 
  //设置元素透明度,透明度值按IE规则计,即0~100 
  SetOpacity: function(ev, v){ 
   ev.filters &#63; ev.style.filter = 'alpha(opacity=' + v + ')' : ev.style.opacity = v / 100; 
  } 
 } 
 //淡入效果(含淡入到指定透明度) 
 function fadeIn(elem, speed, opacity){ 
  /* 
   * 参数说明 
   * elem==&gt;需要淡入的元素 
   * speed==&gt;淡入速度,正整数(可选) 
   * opacity==&gt;淡入到指定的透明度,0~100(可选) 
   */ 
  speedspeed = speed || 20; 
  opacityopacity = opacity || 100; 
  //显示元素,并将元素值为0透明度(不可见) 
  elem.style.display = 'block'; 
  iBase.SetOpacity(elem, 0); 
  //初始化透明度变化值为0 
  var val = 0; 
  //循环将透明值以5递增,即淡入效果 
  (function(){ 
   iBase.SetOpacity(elem, val); 
   val += 5; 
   if (val &lt;= opacity) { 
    setTimeout(arguments.callee, speed) 
   } 
  })(); 
 } 
  
 //淡出效果(含淡出到指定透明度) 
 function fadeOut(elem, speed, opacity){ 
  /* 
   * 参数说明 
   * elem==&gt;需要淡入的元素 
   * speed==&gt;淡入速度,正整数(可选) 
   * opacity==&gt;淡入到指定的透明度,0~100(可选) 
   */ 
  speedspeed = speed || 20; 
  opacityopacity = opacity || 0; 
  //初始化透明度变化值为0 
  var val = 100; 
  //循环将透明值以5递减,即淡出效果 
  (function(){ 
   iBase.SetOpacity(elem, val); 
   val -= 5; 
   if (val &gt;= opacity) { 
    setTimeout(arguments.callee, speed); 
   }else if (val &lt; 0) { 
    //元素透明度为0后隐藏元素 
    elem.style.display = 'none'; 
   } 
  })(); 
 } 
  
  
 var btns = iBase.Id('demo').getElementsByTagName('input'); 
  
 btns[0].onclick = function(){ 
  fadeIn(iBase.Id('fadeIn')); 
 } 
 btns[1].onclick = function(){ 
  fadeOut(iBase.Id('fadeOut'),40); 
 } 
 btns[2].onclick = function(){ 
  fadeOut(iBase.Id('fadeTo'), 20, 10); 
 } 
  
} 
</script> 
 
 
 
 
 
 
 
  
 
  
 
   
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脚本之家是国内专业的网站建设资源、脚本编程学习类网站,提供asp、php、asp.net、javascript、jquery、vbscript、dos批处理、网页制作、网络编程、网站建设等编程资料。
 
 
 
  
 
 
  
 
  
 
    
脚本之家
 
  
 
  
脚本之家是国内专业的网站建设资源、脚本编程学习类网站,提供asp、php、asp.net、javascript、jquery、vbscript、dos批处理、网页制作、网络编程、网站建设等编程资料。
 
 
 
  
 
 
  
 
  
 
    
脚本之家
 
  
 
  
脚本之家是国内专业的网站建设资源、脚本编程学习类网站,提供asp、php、asp.net、javascript、jquery、vbscript、dos批处理、网页制作、网络编程、网站建设等编程资料。
 
 
 
 
 
 
 
 

The above is all the code for realizing the fade-in and fade-out effect in native js. I hope it will be helpful to everyone's learning.