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📁 JavaScript实例
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<html>
<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">

</head>

<body bgcolor="#FFFFFF" >
<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> 
      -&gt; <a href="/pc/index.htm" class="under">电脑乐园</a> -&gt; JavaScript</font></td>
  </tr>
</table>
<div id="D1"> </div>
      
    
<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">
  <tr> 
    <td class=p3 align="center" width=711><b>　　　　<font color="#000000"><b>树 型 
      目 录 菜 单</b></font></b></td>
    <td class="p2" width="1" bgcolor="A8A8AB"><img src="img/blank.gif" width="1" height="1"></td>
    <td class="p2" width="48">&nbsp;</td>
  </tr>
</table>
<table width="760" border="0" cellspacing="0" cellpadding="0" align="center">
  <tr> 
    <td align="center" valign="top">&nbsp;</td>
    <td>&nbsp;</td>
    <td bgcolor="5F74BF" width="28" align="center"><img src="img/bule1.gif" width="28" height="49"></td>
    <td width="37" align="center">&nbsp;</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 class=p2 align="left" > 
      <p><font color="#FF6666"> 　　　　　</font></p>
      <p><font color="#FF6666">　　　　　<img src="img/menu.gif" > 
        <script language="JavaScript" class=p2>
NS4 = (document.layers) ? 1 : 0;
IE4 = (document.all) ? 1 : 0;
ver4 = (NS4 || IE4) ? 1 : 0;

if (ver4) {
    with (document) {
             write("<STYLE TYPE='text/css'>");
            if (NS4) {
            write(".parent {position:absolute; visibility:visible}");
            write(".child {position:absolute; visibility:visible}");
            write(".regular {position:absolute; visibility:visible}")
        }
        else {
            write(".child {display:none}");
        	}
        	write("</STYLE>");
           }
}

function getIndex(el) {
    ind = null;
    for (i=0; i<document.layers.length; i++) {
        whichEl = document.layers[i];
        if (whichEl.id == el) {
            ind = i;
            break;
        }
    }
    return ind;
}

function arrange() {
    nextY = document.layers[firstInd].pageY +document.layers[firstInd].document.height;
    for (i=firstInd+1; i<document.layers.length; i++) {
        whichEl = document.layers[i];
        if (whichEl.visibility != "hide") {
            whichEl.pageY = nextY;
            nextY += whichEl.document.height;
        }
    }
}

function initIt(){
    if (!ver4) return;
    if (NS4) {
        for (i=0; i<document.layers.length; i++) {
            whichEl = document.layers[i];
            if (whichEl.id.indexOf("Child") != -1) whichEl.visibility = "hide";
       }
        arrange();
    }
    else {
        divColl = document.all.tags("DIV");
        for (i=0; i<divColl.length; i++) {
            whichEl = divColl(i);
            if (whichEl.className == "child") whichEl.style.display = "none";
        }
    }
}

function expandIt(el) {
    if (!ver4) return;
    if (IE4) {
        whichEl = eval(el + "Child");
        if (whichEl.style.display == "none") {
            whichEl.style.display = "block";
        }
        else {
            whichEl.style.display = "none";
        }
    }
    else {
        whichEl = eval("document." + el + "Child");
        if (whichEl.visibility == "hide") {
            whichEl.visibility = "show";
        }
        else {
            whichEl.visibility = "hide";
        }
        arrange();
    }
}
onload = initIt;
</script>
        </font></p>
      <div id="KB1Parent" class="parent">　　　　<a href="#" onClick="expandIt('KB1'); return false" ><img src="img/plus.gif" border=0>文件夹一</a></div>
      <div id="KB1Child" class="child">　　　　　<a href="sample.htm" target="_blank" ><img src="img/spacer.gif"  border=0 alt=""><img src="img/open.gif"  border=0>页面一</a><br>
        　　　　　<a href="sample.htm" target="_blank" ><img src="img/spacer.gif"  border=0 alt="" width="15" height="11"><img src="img/open.gif"  border=0>页面二</a><br>
        　　　　　<a href="sample.htm" target="_blank" ><img src="img/spacer.gif"  border=0 alt="" width="15" height="11"><img src="img/open.gif"  border=0>页面三</a></div>
      <div id="KB2Parent" class="parent">　　　　<a href="#" onClick="expandIt('KB2'); return false" ><img src="img/plus.gif" border=0>文件夹二</a></div>
      <div id="KB2Child" class="child">　　　　　<a href="sample.htm" target="_blank" ><img src="img/spacer.gif"  border=0 alt="" width="15" height="11"><img src="img/open.gif"  border=0>页面一</a><br>
        　　　　　<a href="sample.htm" target="_blank" ><img src="img/spacer.gif"  border=0 alt=""><img src="img/open.gif"  border=0>页面二</a><br>
        　　　　　<a href="sample.htm" target="_blank" ><img src="img/spacer.gif"  border=0 alt="" width="15" height="11"><img src="img/open.gif"  border=0>页面三</a></div>
      <div id="KB3Parent" class="parent">　　　　<a href="#" onClick="expandIt('KB3'); return false" ><img src="img/plus.gif"  border=0>文件夹三</a></div>
      <div id="KB3Child" class="child"> 　　　　　<a href="sample.htm" target="_blank" ><img src="img/spacer.gif"  border=0 alt=""><img src="img/open.gif"  border=0>页面一</a><br>
        　　　　　　<a href="sample.htm" target="_blank" ><img src="img/open.gif"  border=0>页面二</a><br>
        　　　　　<a href="sample.htm" target="_blank" ><img src="img/spacer.gif"  border=0 alt=""><img src="img/open.gif"  border=0>页面三</a></div>
      <script language="JavaScript">
if (NS4) {
        firstEl = "KB1Parent";
        firstInd = getIndex(firstEl);
        arrange();
}
</script>
      <p>　</p>
      
    </td>
    <td bgcolor="5F74BF" width="28" align="center">&nbsp;</td>
    <td width="37" align="center">&nbsp;</td>
  </tr>
  <tr> 
    <td align="center" valign="top"> 
      <table width="100%" border="0" cellspacing="0" cellpadding="0">
        <tr> 
          <td height="15">&nbsp;</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"><b><br>
      <br>
      </b><span class="p1"><font color="#6633FF"> </font></span><b><br>
      </b>
      <form>
        <p><span class="p1"><font color="#6633FF">这段程序放在&lt;body&gt;与&lt;/body&gt;之间</font></span></p>
        <p> 
          <textarea name="textarea2" onFocus="this.select()" onMouseOver="this.focus()" cols="50" rows="10" wrap="VIRTUAL" style="BACKGROUND-COLOR: #D5E9FD;" >&lt;script language=&quot;JavaScript&quot;&gt;
NS4 = (document.layers) ? 1 : 0;
IE4 = (document.all) ? 1 : 0;
ver4 = (NS4 || IE4) ? 1 : 0;

if (ver4) {
    with (document) {
        write(&quot;&lt;STYLE TYPE='text/css'&gt;&quot;);
        if (NS4) {
            write(&quot;.parent {position:absolute; visibility:visible}&quot;);
            write(&quot;.child {position:absolute; visibility:visible}&quot;);
            write(&quot;.regular {position:absolute; visibility:visible}&quot;)
        }
        else {
            write(&quot;.child {display:none}&quot;)
        }
        write(&quot;&lt;/STYLE&gt;&quot;);
    }
}

function getIndex(el) {
    ind = null;
    for (i=0; i&lt;document.layers.length; i++) {
        whichEl = document.layers[i];
        if (whichEl.id == el) {
            ind = i;
            break;
        }
    }
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