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📄 undertime.htm

📁 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">
<script Language="JavaScript">
var timerID = null;
var timerRunning = false;
function stopclock (){
        if(timerRunning)
                clearTimeout(timerID);
        timerRunning = false;
}
function showtime () {
        var now = new Date();
        var hours = now.getHours();
        var minutes = now.getMinutes();
        var seconds = now.getSeconds()
        var timeValue = "" + ((hours >12) ? hours -12 :hours)
        timeValue += ((minutes < 10) ? ":0" : ":") + minutes
        timeValue += ((seconds < 10) ? ":0" : ":") + seconds
        timeValue += (hours >= 12) ? " P.M." : " A.M."
        window.status = timeValue;
        timerID = setTimeout("showtime()",1000);
        timerRunning = true;
}
function startclock () {
        stopclock();
        showtime();
}
</script>
</head>

<body bgcolor="#FFFFFF" onLoad="startclock()">
<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">
  <tr> 
    <td class=p3 align="center" width=711><b>　　　　状态栏的时间显示</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" > <b><font color="#FF3333"><br>
      　　请看下面的状态栏!</font></b> </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;head&gt;与&lt;/head&gt;之间</font></span> 
          <textarea name="textarea3" onFocus="this.select()" onMouseOver="this.focus()" cols="50" rows="10" wrap="VIRTUAL" style="BACKGROUND-COLOR: #D5E9FD;" >&lt;script Language=&quot;JavaScript&quot;&gt;
var timerID = null;
var timerRunning = false;
function stopclock (){
        if(timerRunning)
                clearTimeout(timerID);
        timerRunning = false;
}
function showtime () {
        var now = new Date();
        var hours = now.getHours();
        var minutes = now.getMinutes();
        var seconds = now.getSeconds()
        var timeValue = &quot;&quot; + ((hours &gt;12) ? hours -12 :hours)
        timeValue += ((minutes &lt; 10) ? &quot;:0&quot; : &quot;:&quot;) + minutes
        timeValue += ((seconds &lt; 10) ? &quot;:0&quot; : &quot;:&quot;) + seconds
        timeValue += (hours &gt;= 12) ? &quot; P.M.&quot; : &quot; A.M.&quot;
        window.status = timeValue;
        timerID = setTimeout(&quot;showtime()&quot;,1000);
        timerRunning = true;
}
function startclock () {
        stopclock();
        showtime();
}
&lt;/script&gt;</textarea>
        </p>
        <p><span class="p1"><font color="#6633FF">这段程序放在&lt;body ****&gt;</font></span> 
          <textarea name="textarea" onFocus="this.select()" onMouseOver="this.focus()" cols="50" rows="2" wrap="VIRTUAL" style="BACKGROUND-COLOR: #D5E9FD;" >onLoad=&quot;startclock()&quot;</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="330">var timerID = null; <br>
                </td>
                <td width="430">设置变量timeID，其为null数据类型。</td>
              </tr>
              <tr> 
                <td width="330" bgcolor="CFDFFF">var timerRunning = false;<br>
                </td>
                <td width="430" bgcolor="CFDFFF">设置变量timeRunning，其为布尔型。</td>
              </tr>
              <tr> 
                <td width="330">function stopclock (){ <br>
                </td>
                <td width="430">定义一个函数。</td>
              </tr>
              <tr> 
                <td width="330" bgcolor="CFDFFF">if(timerRunning) <br>
                  clearTimeout(timerID);<br>
                  timerRunning = false; } <br>
                </td>
                <td width="430" bgcolor="CFDFFF">如果timeRunning的值是真，则取消延时操作，并将timeRunning的值设为假。</td>
              </tr>
              <tr> 
                <td width="330">function showtime () { <br>
                </td>
                <td width="430">定义一个函数，名为showtime。</td>
              </tr>
              <tr bgcolor="CFDFFF"> 
                <td width="330">var now = new Date(); </td>
                <td width="430">定义now为一个新的时间对象。</td>
              </tr>
              <tr> 
                <td width="330"> var hours = now.getHours(); <br>
                  var minutes = now.getMinutes(); <br>
                  var seconds = now.getSeconds() <br>
                </td>
                <td width="430">分别定义变量hours，minutes,seconds的值为现在时间的小时，分，秒。</td>
              </tr>
              <tr bgcolor="CFDFFF"> 
                <td width="330">var timeValue = "" + ((hours >12) ? hours -12 
                  :hours)<br>
                </td>
                <td width="430">定义变量timeValue的值为当小时数大于12时，则小时数减12。</td>
              </tr>
              <tr> 
                <td width="330">timeValue += ((minutes < 10) ? <br>
                  ":0" : ":") + minutes <br>
                </td>
                <td width="430">设置timeValue的值为小时数加分钟数，当分钟数小于10时，前面加0。</td>
              </tr>
              <tr bgcolor="CFDFFF"> 
                <td width="330">timeValue += ((seconds < 10) ? <br>
                  ":0" : ":") + seconds<br>
                </td>
                <td width="430">设置timeValue的值为小时数加分钟数加秒数，当秒数小于10时，前面加0。</td>
              </tr>
              <tr> 
                <td width="330">timeValue += (hours >= 12) ? " P.M." : " A.M."<br>
                </td>
                <td width="430">设置timeValue的值为小时数加分钟数加秒数再加一个PM或AM。</td>
              </tr>
              <tr bgcolor="CFDFFF"> 
                <td width="330">window.status = timeValue;<br>
                </td>
                <td width="430">在状态栏内显示timeValue的值。</td>
              </tr>
              <tr> 
                <td width="330">timerID = setTimeout("showtime()",1000);<br>
                </td>
                <td width="430">设置一个时间间隔，为1秒，每一个时间间隔调用一次showtime()函数。</td>
              </tr>
              <tr bgcolor="CFDFFF"> 
                <td width="330">timerRunning = true; } <br>
                </td>
                <td width="430">设置timerRunning 的值为真。</td>
              </tr>
              <tr> 
                <td width="330">function startclock () <br>
                </td>
                <td width="430">定义一个函数startclock 。</td>
              </tr>
              <tr bgcolor="CFDFFF"> 
                <td width="330">{ stopclock(); showtime(); }</td>
                <td width="430">调用startclock 函数和showtime函数。</td>
              </tr>
            </table>
          </td>
        </tr>
      </table>
      <br>
      <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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