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javascript的学习文章

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        <div align="left"><!-- #BeginEditable "1" --><b>别人编的JavaScript，我能使用吗？！</b><br>
          <br>
          <br>
          <font color="#ff0000">第二页：script代码</font> 
          <hr>
          <p>为了教你如何借用JavaScript用于自己的网页。让我们来看一个JavaScript的范例，它可以当你每一次点击Reload时，JavaScript就能改变该网页的背景颜色。<br>
            <br>
            <code>&lt;html&gt;</code><br>
            <code><br>
            </code> <code>&lt;head&gt;</code><br>
            <br>
            <code><font color="#ff0000">&lt;script language=&quot;Javascript&quot;&gt;</font></code><br>
            <br>
            <code> <font color="#0000FF">&lt;!-- hide from old browsers</font></code><font color="#0000FF"><br>
            <br>
            <code>function setBackgroundColor(color,color2,color3,color4){</code><br>
            <br>
            <code>theColors=new Arry(color1,color2,color3,color4):</code><br>
            <br>
            <code>var whichColor=Math.round(Math.random()*1000)%4;</code></font></p>
          <p> <font color="#0000FF"><code>document.bgColor=theColors(whichColor);</code><br>
            <br>
            }<br>
            <br>
            <code>// stop hiding--&gt;</code><br>
            </font><br>
            <code> <font color="#ff0000">&lt;/script&gt;</font></code><br>
            <br>
            <code> &lt;/head&gt;</code><br>
            <br>
            <code>&lt;body <font color="#ff0000">onload</font>=<font color="#0000FF">&quot;setBackgroundColor('#ff0000','#00ff00','#ffff00','#3333ff');</font>&gt;</code><br>
            <br>
            <code> &lt;font face=&quot;Arial,Helvetica,sans-serif&quot; size=&quot;4&quot;&gt;</code><br>
            <br>
            <code>Hit Reload (or Refresh if you are using Internet Explorer)</code><br>
            <br>
            <code>to see a new background.</code><br>
            <br>
            <code>&lt;/font&gt;</code><br>
            <br>
            <code>&lt;/body&gt;</code><br>
            <br>
            <code>&lt;html&gt;</code><br>
            <br>
            为了看到这段代码实现的效果，<a href="page6.htm">请到这里</a>。当你点击刷新几次以后，你将看到页面的显示效果。让我们来学这段代码是如何工作的。<br>
            <br>
            这儿有一些知识你需要知道.首先，请你注意<font color="#ff0000"><code>〈script〉</code></font>标记（在上面的代码中用红色标记。），这些代码的作用是在你的文件中区别一般HTML语言和JavaScript。任何在<code>〈script〉</code>和<code>〈/script〉</code>之间的内容都被解释为JavaScript。在JavaScript出现之前的老的浏览器将忽略在<code>〈script〉</code>标记中的内容。但是在某种情况下，这些老的浏览器将尽力把该段代码显示为文本内容。所以，你应该在你的代码中加入〈！--和//--〉，在这两个标记中间，你添加一些<a href="http://hotwired.lycos.com/webmonkey/teachingtool/comment.html">解释性的语言</a>，当老的浏览器无法支持JavaScript时，可以将这些内容显示出来，为用户提供提示。<br>
            <br>
            通常情况下，你可以将JavaScript放在HTML的任何的地方。但是用一点，我应该告诉你：你把JavaScript放在不同的地方，他被执行的顺序也会有所不同。例如：添加在<code>〈head〉</code>和<code>〈/head〉</code>之间的JavaScript执行顺序将优于添加在<code>〈body&gt;&lt;/body〉</code>之间的JavaScript的执行顺序。<br>
            <br>
            现在我们已经知道你可以将JavaScript放在HTML语言的任何地方。接下来，我将告诉你，这些JavaScript是如何执行的。<br>
            <br>
            <a href="index.htm">首页</a> <br>
          <table width="88%" border="0">
            <tr> 
              <td width="51%">1）<font color="#ff0000"><a href="page1.htm">借用他人的JavaScript代码</a></font></td>
              <td width="49%">4）<font color="#000000"><a href="page4.htm">事件和事件处理器</a></font></td>
            </tr>
            <tr> 
              <td width="51%">2）<font color="#ff0000">script代码</font></td>
              <td width="49%">5）<font color="#000000"><a href="page5.htm">总结</a></font> 
              </td>
            </tr>
            <tr> 
              <td width="51%">3）<font color="#000000"><a href="page3.htm">函数（和他们的参数）</a></font> 
              </td>
              <td width="49%">&nbsp;</td>
            </tr>
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