javascript淡入淡出弹出窗口_javascript实现弹窗渐入渐出-优快云博客

本文介绍了一种使用JavaScript实现HTML元素的淡入和淡出效果的方法。通过修改元素的透明度并控制其显示状态，可以实现平滑过渡。适用于网页中需要动态展示或隐藏内容的场景。

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title></title>
<SCRIPT>
var intTimeStep=20;
var isIe=(window.ActiveXObject)?true:false;
var intAlphaStep=(isIe)?5:0.05;
var curSObj=null;
var curOpacity=null;
function startObjVisible(objId)
{
curSObj=document.getElementById(objId);
setObjState();
}
function setObjState(evTarget)
{
if (curSObj.style.display==""){curOpacity=1;setObjClose();}
else{
if(isIe)
{
curSObj.style.cssText='DISPLAY: none;Z-INDEX: 1; FILTER: alpha(opacity=0); POSITION: absolute;';
curSObj.filters.alpha.opacity=0;
}else
{
curSObj.style.opacity=0
}
curSObj.style.display='';

curOpacity=0;
setObjOpen();
}
}

function setObjOpen()
{
if(isIe)
{
curSObj.filters.alpha.opacity+=intAlphaStep;
if (curSObj.filters.alpha.opacity<100) setTimeout('setObjOpen()',intTimeStep);
}else{
curOpacity+=intAlphaStep;
curSObj.style.opacity =curOpacity;
if (curOpacity<1) setTimeout('setObjOpen()',intTimeStep);
}
}

function setObjClose()
{
if(isIe)
{
curSObj.filters.alpha.opacity-=intAlphaStep;
if (curSObj.filters.alpha.opacity>0) {
setTimeout('setObjClose()',intTimeStep);}
else {curSObj.style.display="none";}
}else{
curOpacity-=intAlphaStep;
if (curOpacity>0) {
curSObj.style.opacity =curOpacity;
setTimeout('setObjClose()',intTimeStep);}
else {curSObj.style.display='none';}
}
}
</SCRIPT>
</head>
<body>
<table width=80%><tr><td>效果一：手动控制展现或消失<br><input type=button οnclick="startObjVisible('objDiv');if(this.value=='点击展现'){this.value='点击隐藏'}else{this.value='点击展现'}" value="点击展现"></td>
</tr>
<tr><td><DIV id="objDiv" style="DISPLAY: none;">
<img src="http://www.zj-blog.com/common/images/emot/Face_21.gif">测试效果<img src="http://www.zj-blog.com/common/images/emot/Face_21.gif"></DIV></td></tr>
</table>

</body>
</html>