blocks|key|431444|text|在分析器中运行您的代码，看看它实际在做什么。看看你的时间都花在哪里了。IE8提供了IE7兼容性，并在其开发人员工具中包含了一个像样的分析器。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|431445|要直接在IE7中进行分析，您必须使用Visual+Web+Developer或与MS+Office捆绑在一起的调试器。更多的闲逛是必要的，但让它发挥作用是可能的。每次我需要在一台新电脑上设置它时，我都要花一个小时或更多的时间来弄清楚让它工作的魔力咒语，但它是可行的。|431446|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Run your code in a profiler and see what it is actually doing. See where your time is spent. IE8 provides IE7 compatibility and a decent profiler included in its Developer Tools. 

To do the profiling in IE7 directly you will have to mess around with Visual Web Developer or the debugger bundled with MS Office. More fooling around is necessary, but it is possible to get it to work. Every time I have needed to set this up on a new computer it has taken me an hour or more to figure out the magic incantation to make it work, but it is doable.

blocks|key|5565544|text|一些即兴的建议..。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5565545|5565546|闪存作为协处理器。如果你有计算成本很高的事情要做，你可以把它们交给Flash。ActionScript将会比IE糟糕的JS更快。然而，请注意，如果你在JS和闪存之间来回传输大量数据，速度会非常慢。|ordered-list-item|5565547|谷歌齿轮。你可以使用web+worker来加快速度。当您检测到Silverlight时，可以说升级到IE8或安装Google+Gears会改善experience.|5565548|Possibly+Silverlight可以作为协处理器使用的性能。然而，我没有使用它的经验。|5565549|5565550|你能分辨出什么是慢的吗？是当你触摸DOM的时候吗？|5565551|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|P|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|Q|8|@]|9|@]|A|$]]|$1|F|3|G|5|E|7|R|8|@]|9|@]|A|$]]|$1|H|3|I|5|E|7|S|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|N|$]]

A couple off-the-wall suggestions...

<ol>
<li>Flash as coprocessor. If you have computationally expensive things to do, you can hand them off to Flash. The ActionScript is going to be faster than IE's lousy JS. However, be aware that if you transfer much data back and forth between JS and Flash, it's very slow.</li>
<li>Google Gears. You can speed things up with web workers. When you detect IE7, say that upgrading to IE8 or installing Google Gears will improve the experience.</li>
<li>Possibly Silverlight could be used as a coprocessor. I don't have experience with it, however.</li>
</ol>

Can you even tell what's slow? Is it when you touch the DOM?

blocks|key|431501|text|这是一段优秀的google技术演讲视频，由javascript专家Nicholas+C.+Zakas+http://www.youtube.com/watch?v=mHtdZgou0qU撰写。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|431502|他建议您使用局部变量来限制作用域查找，将javascript+css样式的更改保持在最低限度(改为更改类)，并在必要时分批执行，以减少浏览器的重新呈现，以及许多其他很好的技巧:)|431503|entityMap|0|LINK|mutability|MUTABLE|url|http://www.youtube.com/watch?v=mHtdZgou0qU^0|1F|16|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]]|C|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]]]

This is an excellent google tech talk video on javascript optimization by javascript guru Nicholas C. Zakas
<a href="http://www.youtube.com/watch?v=mHtdZgou0qU" rel="nofollow noreferrer">http://www.youtube.com/watch?v=mHtdZgou0qU</a>

He advises you to use local variables to limit scope lookup, keep javascript css style changes to a minimum(change classes instead) and do them in batches if you have to to reduce browser re-rendering, and lots of other great tips :)

blocks|key|434211|text|我有点觉得这些答案中的一些可能遗漏了显而易见的东西。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|434212|您正在使用的算法的效率是多少？线性？对数算法？指数型？在我看来，如果是JAVASCRIPT变慢了，随着文档变得更大，那么问题就是代码的效率，而不是MS的。IE+javascript很慢，但是什么让你如此确定这是浏览器的问题呢？其他的javascript引擎能做的很好吗？|434213|在不知道你正在做什么或如何做的情况下，一种方法是用内存使用来换取速度-缓存以前的结果，以及其他优化策略，如果你读了这本书或那个关于编程的网站，你会发现这些优化策略到处都是。|434214|另一件要记住的事情是dom交互非常慢。如果您可以重新组织代码以实现相同的功能，但在dom中的操作更少，这将提高性能。|434215|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|L|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|M|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

I kind of feel like maybe some of these answers might be missing the obvious.

What is the efficiency of the algorithm you are using? Linear? Logorithmic? exponential? It seems to me, that if it's the JAVASCRIPT that's getting slower, as the document gets larger, then it's the efficiency of YOUR code that's the problem, not MS's. IE javascript is slow, but what makes you so sure that it's specifically a problem with that browser? Do other javascript engines do okay with it?

Without knowing a single thing about what you're doing or how you're doing it, one way to go is to trade off memory usage for speed- Cache previous results, and other optimization strategies which you can find lying around if you read this book or that website about programming. 

Another thing to keep in mind is that dom interaction is really slow. If you can reorganize your code to achieve the same thing, but with fewer manipulations in the dom, that will improve performance

blocks|key|5565648|text|根据需要附加和分离事件，并且不使用行为。另外，使用setTimeout和setInterval创建线程来加速UI。我一直这样做是为了防止IU的波动。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5565649|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Attach and detach events as needed and do not use behaviors. Also create threads to speed up UI using setTimeout and setInterval. I do this all the time to prevent IU choppiness.

blocks|key|5565651|text|一些相当常见的问题几乎只与DOM有关，DOM在浏览器中的访问速度很慢。尽可能尝试使用innerHTML。这不是一种符合标准的方法，但它是迄今为止最快的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5565652|如果您使用如下代码遍历DOM元素：|5565653|for+(var+i+=+0;+i+<+domNodes.length;+i%2B%2B)+{+...+}|code-block|syntax|javascript|5565654|请注意，每次请求NodeList的长度时，都会执行相当昂贵的查找操作。您最好按如下方式缓存NodeList的长度：|offset|length|style|CODE|5565655|for+(var+i+=+0,+il+=+domNodes.length;+i+<+il;+i%2B%2B)+{+...+}|5565656|这里的性能提升令人难以置信。Robert+Nyman对for循环做了一个有趣的比较。如果您从未听说过这一点，那么性能提升可能会让您大吃一惊。|5565657|entityMap|0|LINK|mutability|MUTABLE|url|http://robertnyman.com/2008/04/11/javascript-loop-performance/^0|0|0|0|8|8|19|8|0|0|R|3|E|C|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|12|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|13|8|@$K|14|L|15|M|N]|$K|16|L|17|M|N]]|9|@]|A|$]]|$1|O|3|P|5|F|7|18|8|@]|9|@]|A|$G|H]]|$1|Q|3|R|5|6|7|19|8|@$K|1A|L|1B|M|N]]|9|@$K|1C|L|1D|1|1E]]|A|$]]|$1|S|3|-4|5|6|7|1F|8|@]|9|@]|A|$]]]|T|$U|$5|V|W|X|A|$Y|Z]]]]

Some pretty regular gotchas pertain almost exclusively to the DOM, which is slow accross browsers. Try to user innerHTML wherever possible. It's not the standards-compliant way of doing things, but it is by far the fastest.

If you're looping through DOM elements using something like the following:

<pre><code>for (var i = 0; i &lt; domNodes.length; i++) { ... }
</code></pre>

Note that every time you request the length of a <code>NodeList</code>, a rather expensive lookup operation is performed. You're better off caching the length of the <code>NodeList</code> as follows:

<pre><code>for (var i = 0, il = domNodes.length; i &lt; il; i++) { ... }
</code></pre>

The performance improvements here are incredible. <a href="http://robertnyman.com/2008/04/11/javascript-loop-performance/" rel="nofollow noreferrer">Robert Nyman</a> did an interesting comparison of <code>for</code> loops. If you've never heard of this, the performance boost might surprise you.

I am trying to develop a application that has quite a bit of client side based scripts. The page has sections that interact with each other based on different inputs. The problem is when you get alot of content on the page the page slows down DRAMATICALLY in IE7 due to the poor javascript engine integrated with this browswer and also partly, becasue there is quite a bit more data on the page. 

I am already using web services for anything I can, JQuery with ID based selectors and as little effects and animations as I can. 

Do you guys have any tips that I could use for optimization of this?

IE7 Javascript Performance

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正在尝试开发一个应用程序，有相当多的基于客户端的脚本。该页面具有基于不同输入彼此交互的部分。问题是，当你在页面上获得大量内容时，由于与浏览器集成的糟糕的javascript引擎，页面在IE7中会显著减慢，而且部分原因是页面上有相当多的数据。我已经在使用web服务来做我能做的任何事情，使用基于ID的选择器的JQuery...

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