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📁 简单的讲解语言,非常实用,使你在短期内就能熟练掌握其变成技巧
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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" onunload = stay()>
<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实例</font></td>
  </tr>
</table>
<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>　　　　　离开时显示停留时间</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> 
      <script language="Javascript">
      if(document.layers)
	{
	   alert("此效果在Netscape浏览器中只有刷新屏幕时，才可以看到效果！");
	}
	<!--
		pageOpen = new Date();
		function stay() {
		pageClose = new Date();
		minutes = (pageClose.getMinutes() - pageOpen.getMinutes());
		seconds = (pageClose.getSeconds() - pageOpen.getSeconds());
		time = (seconds + (minutes * 60));
		time = (time + " 秒钟");
		alert('您在这儿停留了' + time + '.欢迎下次再来!');
		} 
		//-->
	</script>
    </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> 
          <td height="20">&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">这段程序放在&lt;body&gt;与&lt;/body&gt;之间</font></span><br>
      <form>
        <textarea name="textarea" onFocus="this.select()" onMouseOver="this.focus()" cols="50" rows="10" wrap="VIRTUAL" style="BACKGROUND-COLOR: #D5E9FD;" >&lt;script language=&quot;Javascript&quot;&gt;
&lt;!--
pageOpen = new Date();
function stay() {
pageClose = new Date();
minutes = (pageClose.getMinutes() - pageOpen.getMinutes());
seconds = (pageClose.getSeconds() - pageOpen.getSeconds());
time = (seconds + (minutes * 60));
time = (time + &quot; 秒钟&quot;);
alert('您在这儿停留了' + time + '.欢迎下次再来!');
} 
//--&gt;
&lt;/script&gt;</textarea>
      </form>
      <span class="p1"><font color="#6633FF"><br>
      这段程序放在&lt;body ****&gt;正文中</font></span> 
      <form>
        <textarea name="textarea" onFocus="this.select()" onMouseOver="this.focus()" cols="50" rows="2" wrap="VIRTUAL" style="BACKGROUND-COLOR: #D5E9FD;" >onUnload=stay()</textarea>
      </form>
      <b><br>
      </b></td>
    <td bgcolor="5F74BF" width="28" align="center">&nbsp;</td>
    <td width="37" align="center">&nbsp;</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">&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>
</table>
<table width="760" border="0" cellspacing="0" cellpadding="0" align="center">
  <tr> 
    <td class="p2" align="right" width="692"> <br>
      <table width="654" border="0" cellspacing="0" cellpadding="0">
        <tr> 
          <td> 
            <table width="100%" border="1" cellspacing="1" cellpadding="1" bordercolorlight="#666666" bordercolordark="#666666" class=p2>
              <tr> 
                <td width="293">pageOpen = new Date();<br>
                </td>
                <td width="346">定义一个新的日期对象，纪录开始浏览页面时间。</td>
              </tr>
              <tr bgcolor="CFDFFF"> 
                <td width="293">function stay() </td>
                <td width="346">定义一个函数。</td>
              </tr>
              <tr> 
                <td width="293"> pageClose = new Date(); <br>
                </td>
                <td width="346">定义一个新的日期对象，纪录结束浏览页面时间。</td>
              </tr>
              <tr bgcolor="CFDFFF"> 
                <td width="293">minutes = (pageClose.getMinutes() - pageOpen.getMinutes());<br>
                </td>
                <td width="346">“分钟”变量等于结束时间的分钟数减去开始时间的分钟数。</td>
              </tr>
              <tr> 
                <td width="293">seconds = (pageClose.getSeconds() - pageOpen.getSeconds()); 
                  <br>
                </td>
                <td width="346">“秒数”变量等于结束时间的秒数数减去开始时间的秒数数。</td>
              </tr>
              <tr bgcolor="CFDFFF"> 
                <td width="293">time = (seconds + (minutes * 60));<br>
                </td>
                <td width="346">时间变量等于“秒数”变量加上“分钟”变量乘以60，即变为以秒纪录。</td>
              </tr>
              <tr> 
                <td width="293">time = (time + " 秒钟"); alert('您在这儿停留了' + time 
                  + '.欢迎下次再来!');<br>
                </td>
                <td width="346">alert()是JavaScript的窗口对象方法，其功能是弹出一个具有OK对话框并显示（）中的字符串 
                  ，告诉在此页面停留的时间。</td>
              </tr>
              <tr bgcolor="CFDFFF"> 
                <td width="293">onUnload=stay()</td>
                <td width="346">页面卸载的时候，调用stay()函数。</td>
              </tr>
            </table>
          </td>
        </tr>
      </table>
      <br>
    </td>
    <td class="p2" width="19">&nbsp;</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 bgcolor="5F74BF"> 
    <td>&nbsp;</td>
  </tr>
</table>
<p>&nbsp;</p>
</body>
</html>

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