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Posted on April 14th, 2010 by jeanne

接下来,继续讨论的下一篇 …

Chapter 4 Optimization[优化]


  • 保持较短的文档大小

由于移动设备中可用的内存有限,所以我们应该使文档尽可能短。然而,又因为XHTML MP与WML不同,它不能在一个文档中支持多“卡片”,所以把内容分为多个独立页面将会使载入的速度减慢。因此,应把所有相关信息结合在同一页面中,并利用分段锚来帮助跳转至相关章节部分。




3.文件名、Class 和IDs应尽量使用简短命名方式,又不能是完全没有意义或不可理解的命名。

4. 务必在发布前删除注释以及不必要的空格

  • 保持用户任务流的流畅及图像的合理使用

色彩丰富的页面看起来固然诱人,但当图像传输使得服务减慢时,绚丽的页面也许并不让人觉得很舒服。根据可用性研究, 用户不太热衷于那些由于图像传输而中断他们任务流的服务。特别地,当用户在搜寻目标页面时,大的图像就不太合适。含有信息价值的图像是令人青睐的,但在多数情况下,用户要么屏蔽图片以节省时间和金钱,要么不等图像下载就切换到下个页面。在下载完所有图像之前允许用户继续浏览页面,是很重要的。 大表格也许会产生相似的问题——也就是说,在某一页面下载完之前,用户的操作被冻结或者在页面下载完之前不能继续进行其他操作。因为手机屏幕的大小不同,所以开发人员应确保即使是在最小的显示屏上,也能够阅读数据表格,通常这些数据表格要进行压缩以符合显示屏的要求。

  • 尽可能减少图片数量和减小图片大小


  • 定义图像高度和宽度属性

建议开发人员在标记语言中明确地指定图像的高度和宽度,以使浏览器为图像预留适当的空间。如果在img标签中使用高度和宽度参数,那么 浏览器就能在下载图像之前为图像预留空间。因此,在图像下载之前页面就能够显示出来,当然,图像在下载后也能够出现在页面上。这并不影响页面的完整下载和处理时间,但却大大改善用户的感受,因为在下载图像之前用户可浏览页面。

  • 谨慎使用表格

在定义表格单元宽度,尤其是处理嵌套表格时,开发人员应谨慎行事。  CSS single-pass (固定)算法能够用于设计表格布局以便优化CPU利用率。然而,与CSS multi-pass (动态) 表格布局算法不同,固定表格布局算法根据表格的第一行来确定表格的列数及其大小。因此,通过使用具有明确列宽的矩形表格可以获得最佳性能。如果要用嵌套表格,当明确指定子表格的宽度时,开发人员应避免用子表格宽度的一定比例来指定其父表格的宽度。因为设备具有不同的屏幕尺寸, 所以百分比不一定能够表示相同数量的象素。因此,建议在父表格及其嵌套表格中使用绝对宽度(像素)以确保内容能正确显示。注意必须确保表格的总宽度与所有列的宽度加上边框和单元格间隔的总和是一样的。一般而言,当表格嵌套层数增加时,页面的复杂度和显示页面所需的处理时间也会增加。为了确保能够及时显示页 面,应该避免使用嵌套很深的表格。另外,表格的边框不应该太粗,因为对于显示屏尺寸受限的设备来说,其边框宽度容易占用很多像素,从而使得实际可用的内容区变得太小。

  • 使用HTTP标题指示来支持页面缓存

浏览器能够把已经阅读的页面放在缓存器中。然而,内容开发人员不应假定页面缓存是默认的。如果可能,应与文档一起发送明确的缓存 标题以确保页面在客户端能够缓存。另外,应将过期时间设置为至少数天,这是为了确保在跨越多个时区的情况下,内容能够缓存一段适当的时间。 浏览器不支持在Meta 标签内 (例如,使用 HTTP-EQUIV)放置缓存指示,但可用HTTP标题控制缓存。HTTP 服务器可设置”Cache-control: no-cache” HTTP标题指示,而此服务器放置了能够定义“页面不进行缓存”的页面。缓存使用“最近最少使用”算法,这意味着最少使用的项首先被清除。建议重复使用所有XHTML页面内的图像和外部CSS,以确保它们留在缓存中,以便每次使用它们时不需要重新下载。 注:在Series 60移动设备中,默认设置是缓存内容,除非在HTTP头中有其它要求。而在Series 40移动设备中,默认设置是不缓存内容。

除了上述的优化手段,可能还有很多有待大家一起交流。这里再推荐工具一枚—— 。
看网站的介绍说,“利用移动行业标准与最佳实践来评估移动网站的质量,从而确保网站所提供的 服务可用于全球各种手机”。这个网站会对你的网站做若干个基于行业标准的测试,通过这些测试来帮助你发现你的网站存在的问题,并帮助你修改。为了直观,测 试还会计算出一个分数(满分为5分)
打开,在page check一栏填入你要测试的网址,然后点击红色的”GO”按钮。几秒钟后,你就会被带到测试结果页面。让我们来详细的看下这个结果页。

测试还提供了手机模拟器截图,但都是比较老的手机型号…你还可以在这个网站上用到几个免费的模拟器:Nokia N70, Samsung z105, Sony Ericsson K750i, Motorola V3i and Sharp GX-10。

比如我的网站的”Form submit buttons”测试失败了,下面的测试介绍详细给出了失败的原因,以及确保这个测试成功的重要性。那意思说我有一个form没有提交按钮,这样会让手机用户无法提交…确实,我的网页最上面那个搜索框是没有按钮的…

This entry was posted on Wednesday, April 14th, 2010 at 06:48 and is filed under . You can follow any responses to this entry through the feed. You can , or from your own site.

  1. on said:


  2. on said:


  3. on said:


  4. jeanne on said:


  5. Derek on said:

    接上文,使用web-app的开发模式 我觉得更合适

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