脚本动态生成VML_VML相关
我们编写 VML 很重要的就是要和 数据库结合，如果和数据库结合了，读数据和把数据转换成 VML 变成了两部分。如果直接使用 ASP 生成 包含很多 VML 的页面，一旦数据量多了，整个页面就变得很庞大，下载速度慢了，IE解释代码的速度也慢了，所以用脚本动态生成 VML 变得非常重要了。
用 VML 画一个示意图，可以更明确上面的意义：
前面的图文简单的说就是：使用一个 Iframe 做后台，前台用脚本生成。也许担心，后台已经完成了，但前台还没有初始化的情况，你可以放心，因为读数据的过程肯定相对要慢，如果担心数据量少，只要你把脚本放在 Body 前面，Iframe 放在 Body 的最后面，就不会产生同步错误的问题了。
现在来具体讲讲如何用脚本动态产生 VML 。其实这和用脚本动态产生 HTML 是一样的过程。
相应的在 readData.asp 里面:
<script></script>
'数据库连接部分
'读数据部分
Do Until rs.EOF
%>
parent.createPoint(x%>,y%>,value%>);
Loop
'数据库关闭部分
%>
上面的颜色采用 HomeSite 4.5.2风格
我们一开始就有了 Group1 ，所有以后动态生成的 VML 直接插入到 Group1 的后面就可以了。曾经做了三个实验，第一个是普通的，用ASP生成 VML 代码；第二个是不用Iframe，在同一个页面生成脚本；第三个就是上面的例子，使用Iframe 产生脚本。结果在大数据量的条件下，效率最高的是第三个，其次是第二个，第一个有明显的慢的感觉。
接下来的一节，将讲述VML最激动人心的功能，放大缩小！
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