Question

我有一个页面，当我将鼠标悬停在链接上时，它会在页面的另一部分上更改图像和一些html。但是，我想知道这个脚本是如何工作的，当我看到页面顶部的脚本时：

  <script type="text/javascript">
    var CONTENT_CURRENT = 0;

    showContent = function() {
        if (CONTENT_CURRENT > 0) {
            var o = YAHOO.util.Dom.get('content' + CONTENT_CURRENT);
            o.style.display = 'none';

            var a = YAHOO.util.Dom.get('link' + CONTENT_CURRENT);
            a.style.color = '#46689e';
        }
        var c = YAHOO.util.Dom.get('content' + arguments[0]);
        c.style.display = 'block';

        var l = YAHOO.util.Dom.get('link' + arguments[0]);
        l.style.color = '#000000';

        CONTENT_CURRENT = arguments[0];
    };

    YAHOO.util.Event.onDOMReady(function() { showContent('1'); });
  </script>

此脚本如何设置页面上的元素？实际页面位于：

Link to site

标题为“流媒体软件产品”......

Answer 1

您需要了解另一个代码块才能理解此代码

  <div class="real-products-mid-lh">
    <a id="link5" href="/products/helix_server.aspx" onmouseover="showContent('5')">Helix Server</a><br />
    <a id="link1" href="/products/rlp.aspx" onmouseover="showContent('1')">Real License Program</a><br />
    <a id="link2" href="/products/helix_security_manager.aspx" onmouseover="showContent('2')">Helix Security Manager</a><br />
    <a id="link3" href="/products/real_player_enterprise_manager.aspx" onmouseover="showContent('3')">RealPlayer Enterprise</a><br />
    <a id="link4" href="/products/helix_mobile_server.aspx" onmouseover="showContent('4')">Helix Mobile Server</a><br />
    <a id="link6" href="/products/helix_proxy.aspx" onmouseover="showContent('6')">Helix Proxy</a><br />
    <a id="link7" href="/products/real_producer.aspx" onmouseover="showContent('7')">RealProducer</a><br />
    <a id="link8" href="/products/capture_station.aspx" onmouseover="showContent('8')">Accordent Capture Station</a><br />
    <a id="link9" href="/products/elp.aspx" onmouseover="showContent('9')">Real Education Licensing</a><br />
    <a id="link10" href="/products/helix_mobile_producer.aspx" onmouseover="showContent('10')">Helix Mobile Producer</a>
  </div>

此处列表中的每个链接都以showContent作为参数调用showContent。下面有一堆像这样的div：

 <div id="content1" style="display:none;">
          <div class="real-products-mid-rh">
            <div class="real-products-logos">
              <table width="100%" cellpadding="0" cellspacing="0" style="border:1px solid #d6d6d6; height:107px;">
                <tr>
                  <td align="center"><a href="/products/rlp.aspx"><img src="/_common/images/logo_real_sm.gif" alt="Real License Program" style="vertical-align:middle" /></a></td>
                </tr>
              </table>
              <table width="100%" cellpadding="0" cellspacing="0" style="border-left:1px solid #d6d6d6; border-right:1px solid #d6d6d6; border-bottom:1px solid #d6d6d6; padding-top:5px; padding-bottom:5px;">
                <tr align="center">
                  <td><a href="/products/rlp.aspx"><strong>LICENSE PROGRAM</strong></a></td>
                  <td><a href="/products/rlp.aspx"><img src="/_common/images/px_more.gif" alt="Find out more" /></a></td>
                  <td>&nbsp;</td>
                </tr>
              </table>
            </div>
            <p><strong>Cost effective and all encompassing RealNetworks License Programme available exclusively to UK enterprise customers<br />
              <a href="/products/rlp.aspx">Real License Program &nbsp; <img src="/_common/images/px_more.gif" alt="Find out more" /></a></strong></p>
          </div>
      </div>

该div的ID是“content1”。所以showContent函数做了三件事：

如果有内容div 可见，让它隐藏起来（显示=无）
制作所需的内容div 可见。
设置当前的可见内容索引。

这会导致鼠标悬停时链接右侧的内容发生变化。

Answer 2

YAHOO.util.Dom.get()的作用类似于document.getElementById()

o.style.display = 'none';  // hides current content
a.style.color = '#46689e'; // paints current link blue
c.style.display = 'block'; // displays new content
l.style.color = '#000000'; // paints new link black

以下脚本的作用是什么

2 个答案: