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<head>
<title>洪恩在线 - Javascript实例</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<link rel="stylesheet" href="../homepage.css">
<script language=javaScript>
if(document.layers)
{
alert("此效果在Netscape浏览器中不能实现！");
}
</script>
</head>
<body bgcolor="#FFFFFF" onLoad="fade()">
<script language="Javascript" src="/pub/js/head.js"></script>
<table width="760" height="20" border=0 cellspacing="0" cellpadding="0" align="center">
<tr bgcolor="CFDFFF">
<td height=20 class="p1" align="left"><img src="/pc/img/blank.gif" width="12" height="8"><font color="#000000"><font color="#FF9966">当前位置</font>：<a href="/default.htm" class="under">洪恩在线</a>
-> <a href="/pc/index.htm" class="under">电脑乐园</a> -> JavaScript实例</font></td>
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<table width="760" border=0 cellspacing="0" cellpadding="0" align="center">
<tr>
<td width="207" valign="top"><img src="img/bule.gif" width="207" height="13"></td>
<td bgcolor="A8A8AB" width="1"><img src="img/blank.gif" width="1" height="1"></td>
<td align="right" height="22" width=530><img src="img/js.gif" width="186" height="20"></td>
<td width="22"><img src="img/blank.gif" width="1" height="1"></td>
</tr>
</table>
<table width="760" border="0" cellspacing="0" cellpadding="0" align="center">
<tr>
<td width="124"><img src="img/blank.gif" width="1" height="1"></td>
<td background="img/line.gif" height="27" width=636><img src="img/blank.gif" width="1" height="1"></td>
</tr>
</table>
<table width="760" border="0" cellspacing="0" cellpadding="0" align="center">
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<td class="p3" align="center" width=711><b> 淡 出 淡 入 效 果</b></td>
<td class="p2" width="1" bgcolor="A8A8AB"><img src="img/blank.gif" width="1" height="1"></td>
<td class="p2" width="48"> </td>
</tr>
</table>
<table width="760" border="0" cellspacing="0" cellpadding="0" align="center">
<tr>
<td align="center" valign="top"> </td>
<td> </td>
<td bgcolor="5F74BF" width="28" align="center"><img src="img/bule1.gif" width="28" height="49"></td>
<td width="37" align="center"> </td>
</tr>
<tr>
<td align="center" valign="top">
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr align="center">
<td>
<table width="110" border="0" cellspacing="0" cellpadding="0">
<tr bgcolor="5F74BF" align="center">
<td class="p1" align="right"><b><font color="#FFFFFF">效 果 演 示</font></b><font color="#FFFFFF">：</font></td>
<td class="p1" width="11"><img src="img/bule2.gif" width="11" height="18"></td>
</tr>
</table>
</td>
</tr>
</table>
</td>
<td>
<script language="JavaScript">
var b = 1;
var c = true;
function fade(){
if(document.all);
if(c == true) {
b++;
}
if(b==100) {
b--;
c = false
}
if(b==10) {
b++;
c = true;
}
if(c == false) {
b--;
}
child.filters.alpha.opacity=0 + b;
setTimeout("fade()",100);
}
</script>
<img src="img/1.jpg" width="300" height="233" name="child" alt="Image" style="filter:alpha(opacity=0)">
</td>
<td bgcolor="5F74BF" width="28" align="center"> </td>
<td width="37" align="center"> </td>
</tr>
<tr>
<td align="center" valign="top">
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td height="30"> </td>
</tr>
<tr align="center">
<td>
<table width="110" border="0" cellspacing="0" cellpadding="0">
<tr bgcolor="5F74BF" align="center">
<td class="p1" align="right"><b><font color="#FFFFFF">源代码如下</font></b><font color="#FFFFFF">：</font></td>
<td class="p1" width="11"><img src="img/bule2.gif" width="11" height="18"></td>
</tr>
</table>
</td>
</tr>
</table>
</td>
<td width="457" class="p2" valign="top"><br>
<br>
<span class="p1"><font color="#6633FF">这段程序放在<body>与</body>之间</font></span><br><form>
<textarea name="textarea" onFocus="this.select()" onMouseOver="this.focus()" cols="50" rows="15" wrap="VIRTUAL" style="BACKGROUND-COLOR: #D5E9FD;" ><script language="JavaScript">
var b = 1;
var c = true;
function fade(){
if(document.all);
if(c == true) {
b++;
}
if(b==100) {
b--;
c = false
}
if(b==10) {
b++;
c = true;
}
if(c == false) {
b--;
}
child.filters.alpha.opacity=0 + b;
setTimeout("fade()",100);
}
</script>
<img src="img/1.jpg" name="child" border=0
alt="Image" style="filter:alpha(opacity=0)"></textarea></form>
<br>
</td>
<td bgcolor="5F74BF" width="28" align="center"> </td>
<td width="37" align="center"> </td>
</tr>
<tr>
<td align="center" valign="bottom">
<table width="238" border="0" cellspacing="0" cellpadding="0">
<tr align="center">
<td>
<table width="110" border="0" cellspacing="0" cellpadding="0">
<tr bgcolor="5F74BF" align="center">
<td class="p1" align="right"><b><font color="#FFFFFF">源程序讲解：</font></b></td>
<td class="p1" width="11"><img src="img/bule2.gif" width="11" height="18"></td>
</tr>
</table>
</td>
</tr>
</table>
</td>
<td width="457" class="p2" valign="top"> </td>
<td bgcolor="5F74BF" width="28" align="center"><img src="img/bule1.gif" width="28" height="49"></td>
<td width="37" align="center"> </td>
</tr>
</table>
<table width="760" border="0" cellspacing="0" cellpadding="0" align="center">
<tr>
<td class="p2" align="right" width="693"> <br>
<table width="522" border="1" cellspacing="0" cellpadding="0" bordercolorlight="#000000" bordercolor="#FFFFFF">
<tr>
<td>
<table width="650" border="1" cellspacing="0" cellpadding="6" bordercolor="#FFFFFF" bordercolorlight="#003333">
<tr bgcolor="CFDFFF">
<td class="p2" bgcolor="ffffff" width="45%">var b = 1;<br>
</td>
<td class="p2" bgcolor="ffffff" width="55%">定义变量b的值为1。</td>
</tr>
<tr bgcolor="CFDFFF">
<td class="p2" bgcolor="CFDFFF" width="45%">var c = true;</td>
<td class="p2" bgcolor="CFDFFF" width="55%">定义变量c为布尔型变量，值为true.</td>
</tr>
<tr bgcolor="CFDFFF">
<td class="p2" bgcolor="ffffff" width="45%"> function fade() </td>
<td class="p2" bgcolor="ffffff" width="55%">定义一个函数，名为fade.</td>
</tr>
<tr bgcolor="CFDFFF">
<td class="p2" bgcolor="CFDFFF" width="45%">{ if(document.all);<br>
if(c == true)<br>
{ b++; } <br>
} </td>
<td class="p2" bgcolor="CFDFFF" width="55%">当用户的浏览器是IE时，且C的值为真时，b的值累加，即b=b+1。</td>
</tr>
<tr bgcolor="CFDFFF">
<td class="p2" bgcolor="ffffff" width="45%">if(b==100)<br>
{ b--; c = false } <br>
</td>
<td class="p2" bgcolor="ffffff" width="55%">如果b的值为100时，其值自减，即b=b-1,即透明度下降，且c的值为假。</td>
</tr>
<tr bgcolor="CFDFFF">
<td class="p2" bgcolor="CFDFFF" width="45%">f(b==10) { b++; c
= true; }</td>
<td class="p2" bgcolor="CFDFFF" width="55%">如果b的值为10时，其值自加，即b=b+1，且c的值为真。</td>
</tr>
<tr bgcolor="CFDFFF">
<td class="p2" bgcolor="ffffff" width="45%">if(c == false) { b--;
} <br>
child.filters.alpha.opacity=0 + b;<br>
</td>
<td class="p2" bgcolor="ffffff" width="55%">且C的值为假时，b的值自减。此时，这张图的alpha(透明度)等于“0+b”的值。</td>
</tr>
<tr bgcolor="CFDFFF">
<td class="p2" bgcolor="CFDFFF" width="45%">setTimeout("fade()",100);</td>
<td class="p2" bgcolor="CFDFFF" width="55%">图像每100毫秒，调用一次fade函数，即透明度变化一次。可以通过调整这个数字，来控制变化的快慢。</td>
</tr>
<tr bgcolor="CFDFFF">
<td class="p2" bgcolor="ffffff" width="45%"><img src=img/1.jpg
name=child style="filter:alpha(opacity=0></td>
<td class="p2" bgcolor="ffffff" width="55%">插入一个文件名为“1.jpg”的图片，name=child，设置其透明度为0。</td>
</tr>
</table>
</td>
</tr>
</table>
<br>
<table width="640" border="0" cellspacing="0" cellpadding="0">
<tr>
<td class="p1"><font color="#6633FF">注：此例效果只能在IE中出现。图片放在与文件同级的“img”文件夹中，名为1.jpg。</font></td>
</tr>
</table>
<br>
</td>
<td class="p2" width="18"> </td>
<td class="p2" width="1" bgcolor="A8A8AB"><img src="img/blank.gif" width="1" height="1"></td>
<td class="p2" width="48"> </td>
</tr>
</table>
<table width="760" border="0" cellspacing="0" cellpadding="0" align="center">
<tr bgcolor="5F74BF">
<td> </td>
</tr>
</table>
<p> </p>
</body>
</html>
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