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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">

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<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实例</font></td>
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</table> 
    
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    <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>
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    <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>
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    <td class=p3 align="center" width=711><b>　　　　随时间变化的图形</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>
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    <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>
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  <tr> 
    <td align="center" valign="top"> 
      <table width="100%" border="0" cellspacing="0" cellpadding="0">
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          <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" > 
      <table width="100%" border="0" cellspacing="0" cellpadding="0">
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          <td>
            <table width="100%" border="0" cellspacing="0" cellpadding="0">
              <tr align="center"> 
                <td width="50" align="right"> 请　　<br>
                  不　　<br>
                  停　　<br>
                  的　　<br>
                  刷　　<br>
                  新　　<br>
                  屏　　<br>
                  幕　　<br>
                  ，　　<br>
                  以　　<br>
                  观　　<br>
                  看　　<br>
                  效　　<br>
                  果　　<br>
                  。　　　<br>
                  <br>
                </td>
                <td width="407" align="left"> 　 
                  <script language="JavaScript"> 
var dt = new Date();
var hr = dt.getSeconds();

if (hr<=20) hr=7;
    else if (hr<=40) hr=8;
    else hr=9;

var msg="<IMG SRC=img/"+hr+".jpg>";
document.write(msg); 
</script>
                  　 </td>
              </tr>
            </table>
          </td>
        </tr>
      </table>
      <p>&nbsp;
    </td>
    <td bgcolor="5F74BF" width="28" align="center">&nbsp;</td>
    <td width="37" align="center">&nbsp;</td>
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    <td align="center" valign="top"> 
      <table width="100%" border="0" cellspacing="0" cellpadding="0">
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          <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><br>
          <br>
          <textarea name="textarea3" onFocus="this.select()" onMouseOver="this.focus()" cols="50" rows="5" wrap="VIRTUAL" style="BACKGROUND-COLOR: #D5E9FD;" >&lt;script language=&quot;JavaScript&quot;&gt; 
var dt = new Date();
var hr = dt.getSeconds();
if (hr&lt;=20) hr=7;
    else if (hr&lt;=40) hr=8;
    else hr=9;
var msg=&quot;&lt;IMG SRC=img/&quot;+hr+&quot;.jpg&gt;&quot;;
document.write(msg); 
&lt;/script&gt;</textarea>
        </p>
        </form>
      <b> </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" height="36"> 
      <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" height="36">&nbsp;</td>
    <td bgcolor="5F74BF" width="28" align="center" height="36"><img src="img/bule1.gif" width="28" height="49"></td>
    <td width="37" align="center" height="36">&nbsp;</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="650" 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="286">var dt = new Date(); <br>
                  <br>
                </td>
                <td width="454">定义一个新的时间对象。</td>
              </tr>
              <tr bgcolor="CFDFFF"> 
                <td width="286">var hr = dt.getSeconds();<br>
                </td>
                <td width="454">定义一个变量,获得当前的秒数。</td>
              </tr>
              <tr> 
                <td width="286">if (hr&lt;=20) <br>
                  hr=7; <br>
                </td>
                <td width="454">当前的秒数小于20时，hr=7。</td>
              </tr>
              <tr bgcolor="CFDFFF"> 
                <td width="286">else if<br>
                  (hr&lt;=40) hr=8;<br>
                </td>
                <td width="454">当前的秒数小于40大于20时，hr=8。</td>
              </tr>
              <tr> 
                <td width="286">else hr=9; <br>
                </td>
                <td width="454">当前的秒数大于40小于60时，hr=9。</td>
              </tr>
              <tr bgcolor="CFDFFF"> 
                <td width="286">var msg=&quot;&lt;IMG SRC=img/&quot;+hr+&quot;.jpg&gt;&quot;;<br>
                  document.write(msg); </td>
                <td width="454">设置变量msg的值为要显示图的路径，并输出这张图。</td>
              </tr>
            </table>
          </td>
        </tr>
      </table>
      <br>
      <table width="640" border="0" cellspacing="0" cellpadding="0">
        <tr> 
          <td><span class="p1"><font color="#6633FF">注:本例中所用到的三张图放在与本页面同级的&quot;img&quot;文件夹内,名字分别为7.jpg，8.jpg，9.jpg。</font></span></td>
        </tr>
      </table>
      <br>
    </td>
    <td class="p2" width="18">&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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