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📁 JavaScript实例
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<title>洪恩在线 - Javascript实例</title>
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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">
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    <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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    <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>
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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 机 产 生 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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    <td align="center" valign="top"> 
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            <table width="110" border="0" cellspacing="0" cellpadding="0">
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                <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>&nbsp; </p>
      <p>
        <script language="JavaScript">
a = 3 
var pp = Math.random();
var foot = Math.round(pp * (a-1))+1;
function create() {
        this.src = ''
        this.border = ''
	this.alt = ''
	
}

b = new Array()
for(var i=1; i<=a; i++) { b[i] = new create() }

b[1].src    = "img/4.jpg"
b[1].border = "0"
b[1].alt    = "又是我们俩。"

b[2].src    = "img/2.jpg"
b[2].border = "0"
b[2].alt    = "还是我们俩。"

b[3].src    = "img/3.jpg"
b[3].border = "0"
b[3].alt    = "嘻嘻，还是我们俩。"

var pic = "";

pic += '<img src='+b[foot].src+' border="0"'+' alt='+b[foot].alt+'>';
document.write(pic)
</script>
      </p>
      <p>　　　请不停的刷新本页，您将看到效果</p>
   
      <p>&nbsp;</p>
      </td>
    <td bgcolor="5F74BF" width="28" align="center">&nbsp;</td>
    <td width="37" align="center">&nbsp;</td>
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          <td height="30">&nbsp;</td>
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            <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>
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      </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><b></b></p>
        <p>
          <textarea name="textarea2" onFocus="this.select()" onMouseOver="this.focus()" cols="50" rows="15" wrap="VIRTUAL" style="BACKGROUND-COLOR: #D5E9FD;" >&lt;script language=&quot;JavaScript&quot;&gt;
a = 3 
var pp = Math.random();
var foot = Math.round(pp * (a-1))+1;
function create() {
        this.src = ''
        this.border = ''
	this.alt = ''	
}
b = new Array()
for(var i=1; i&lt;=a; i++) { b[i] = new create() }
b[1].src    = &quot;img/4.jpg&quot;
b[1].border = &quot;0&quot;
b[1].alt    = &quot;&quot;
b[2].src    = &quot;img/2.jpg&quot;
b[2].border = &quot;0&quot;
b[2].alt    = &quot;&quot;
b[3].src    = &quot;img/3.jpg&quot;
b[3].border = &quot;0&quot;
b[3].alt    = &quot;&quot;
var pic = &quot;&quot;;
pic += '&lt;img src='+b[foot].src+' border=&quot;0&quot;'+' alt='+b[foot].alt+'&gt;';
document.write(pic)
&lt;/script&gt;</textarea>
        </p>
        </form>
      <b><br>
      </b></td>
    <td bgcolor="5F74BF" width="28" align="center">&nbsp;</td>
    <td width="37" align="center">&nbsp;</td>
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            <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="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="428">a = 3<br>
                </td>
                <td width="332">设置变量a的初值为3。</td>
              </tr>
              <tr> 
                <td width="428" bgcolor="CFDFFF">var pp = Math.random();<br>
                </td>
                <td width="332" bgcolor="CFDFFF">定义一个变量pp，值为一个随机数。</td>
              </tr>
              <tr> 
                <td width="428">var foot = Math.round(pp * (a-1))+1;<br>
                </td>
                <td width="332">定义一个变量foot,值为一个经过四舍五入的整数，此数不大于3。</td>
              </tr>
              <tr> 
                <td width="428" bgcolor="CFDFFF">function create() <br>
                </td>
                <td width="332" bgcolor="CFDFFF">定义一个函数。</td>
              </tr>
              <tr> 
                <td width="428">{ this.src = ''<br>
                  this.border = '' <br>
                  this.alt = '' } <br>
                </td>
                <td width="332">初始化图片的属性。</td>
              </tr>
              <tr> 
                <td width="428" bgcolor="CFDFFF">b = new Array() <br>
                </td>
                <td width="332" bgcolor="CFDFFF">设置b为一个数组。</td>
              </tr>
              <tr> 
                <td width="428">for(var i=1; i<=a; i++) <br>
                </td>
                <td width="332">开始一个循环，当i&lt;a时，i=i+1。</td>
              </tr>
              <tr> 
                <td width="428" bgcolor="CFDFFF">{ b[i] = new create() } <br>
                  b[1].src = "img/4.jpg"<br>
                  b[1].border = "0"<br>
                  b[1].alt = ""<br>
                  b[2].src = "img/2.jpg" <br>
                  b[2].border = "0"<br>
                  b[2].alt = ""<br>
                  b[3].src = "img/3.jpg" <br>
                  b[3].border = "0"<br>
                  b[3].alt = "" <br>
                </td>
                <td width="332" bgcolor="CFDFFF">分别定义数组b中的值。</td>
              </tr>
              <tr> 
                <td width="428">var pic = "";<br>
                  pic += '&lt;img src='+b[foot].src+' border="0"'+' alt='+b[foot].alt+'>';&gt;';<br>
                </td>
                <td width="332">pic的值为随机产生一幅数组b中的图。</td>
              </tr>
              <tr bgcolor="CFDFFF"> 
                <td width="428">document.write(pic)</td>
                <td width="332">输出pic的值。</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2.jpg，3.jpg，4.jpg。</font></span></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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