blocks|key|107038|text|Javascript在单线程中运行，所以如果你有大量的Javascript调用，比如说像ExtJS这样的库，它可能很慢是很正常的。但是，您可以考虑以下替代方案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|107039|首先，也是最重要的，尽量优化代码。|107040|然后，您可以使用Javascript中的计时器来模拟异步工作。这里有一个很好的例子来说明如何做到这一点：http://ejohn.org/blog/how-javascript-timers-work/|offset|length|107041|如果您想了解更多信息，这里有一些关于如何尝试减少Javascript冻结时间的其他提示。|107042|http://debuggable.com/posts/run-intense-js-without-freezing-the-browser:480f4dd6-f864-4f72-ae16-41cccbdd56cb|107043|祝你好运！|107044|entityMap|0|LINK|mutability|MUTABLE|url|http://ejohn.org/blog/how-javascript-timers-work/|1^0|0|0|1G|1D|0|0|0|0|30|1|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|Y|8|@]|9|@$F|Z|G|10|1|11]]|A|$]]|$1|H|3|I|5|6|7|12|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|13|8|@]|9|@$F|14|G|15|1|16]]|A|$]]|$1|L|3|M|5|6|7|17|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|18|8|@]|9|@]|A|$]]]|O|$P|$5|Q|R|S|A|$T|U]]|V|$5|Q|R|S|A|$T|K]]]]

Javascript runs in a single-thread, so if you have massive Javascript calls, let say with librairies like ExtJS, it's normal that it can be slow. You might however consider the following alternatives:

First and foremost, try to optimize the code as much as you can.

Then, you could use timers in Javascript to simulate asynchronous work. Here is a good example on how to do this : <a href="http://ejohn.org/blog/how-javascript-timers-work/" rel="noreferrer">http://ejohn.org/blog/how-javascript-timers-work/</a>

If you want more information, here are some additional tips on how to attempt to reduce Javascript freezing time.

<a href="http://debuggable.com/posts/run-intense-js-without-freezing-the-browser:480f4dd6-f864-4f72-ae16-41cccbdd56cb" rel="noreferrer">http://debuggable.com/posts/run-intense-js-without-freezing-the-browser:480f4dd6-f864-4f72-ae16-41cccbdd56cb</a>

Good luck !

blocks|key|1089367|text|引用this+answer|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1089368|1089369|+Javascript资源请求确实被阻塞了，但是有一些方法可以绕过这个问题(也就是:头部的DOM注入脚本标记和AJAX请求)，而我自己却没有看到页面，这很可能就是这里发生的事情。|blockquote|1089370|1089371|包含相同JS资源的多个副本是非常糟糕的，但不一定致命，并且是典型的大型站点，这些站点可能是从单独的团队的工作中增加的，或者只是普通的糟糕的编码、规划或维护。|1089372|就yahoo的建议而言，将脚本放在正文的底部，可以改善适当的响应时间，并在一定程度上改善实际加载时间(因为所有以前的资源都允许首先异步)，但它永远不会像非阻塞请求那样有效(尽管它们具有很高的技术能力障碍)。|1089373|1089374|你可以看看YUI关于Non-Blocking+Javascript的博客文章。|1089375|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/950280/javascript-being-loaded-asynchronously-in-firefox-3-according-to-firebug|1|http://yuiblog.com/blog/2008/07/22/non-blocking-scripts/^0|2|B|0|0|0|0|0|0|0|0|A|N|1|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@$A|10|B|11|1|12]]|C|$]]|$1|D|3|-4|5|6|7|13|8|@]|9|@]|C|$]]|$1|E|3|F|5|G|7|14|8|@]|9|@]|C|$]]|$1|H|3|-4|5|6|7|15|8|@]|9|@]|C|$]]|$1|I|3|J|5|6|7|16|8|@]|9|@]|C|$]]|$1|K|3|L|5|6|7|17|8|@]|9|@]|C|$]]|$1|M|3|-4|5|6|7|18|8|@]|9|@]|C|$]]|$1|N|3|O|5|6|7|19|8|@]|9|@$A|1A|B|1B|1|1C]]|C|$]]|$1|P|3|-4|5|6|7|1D|8|@]|9|@]|C|$]]]|Q|$R|$5|S|T|U|C|$V|W]]|X|$5|S|T|U|C|$V|Y]]]]

Quoting <a href="https://stackoverflow.com/questions/950280/javascript-being-loaded-asynchronously-in-firefox-3-according-to-firebug">this answer</a>:

<blockquote>
 Javascript resource requests are
 indeed blocking, but there are ways
 around this (to wit: DOM injected
 script tags in the head, and AJAX
 requests) which without seeing the
 page myself is likely to be what's
 happening here.
 
 Including multiple copies of the same
 JS resource is extremely bad but not
 necessarily fatal, and is typical of
 larger sites which might have been
 accreted from the work of separate
 teams, or just plain old bad coding,
 planning, or maintenance.
 
 As far as yahoo's recommendation to
 place scripts at the bottom of the
 body, this improves percieved response
 times, and can improve actual loading
 times to a degree (because all the
 previous resources are allowed to
 async first), but it will never be as
 effective as non-blocking requests
 (though they come with a high barrier
 of technical capability).
</blockquote>

You can take a look at a YUI blog entry about <a href="http://yuiblog.com/blog/2008/07/22/non-blocking-scripts/" rel="nofollow noreferrer">Non-Blocking Javascript</a>.

blocks|key|1089254|text|我相信你可以使用Workers，但它似乎是在FF3.5中实现的，但很少有其他的实现。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1089255|请参阅http://hacks.mozilla.org/2009/07/working-smarter-not-harder/|offset|length|1089256|entityMap|0|LINK|mutability|MUTABLE|url|http://hacks.mozilla.org/2009/07/working-smarter-not-harder/^0|0|3|1O|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

I believe you can use Workers, but it seems to be implemented in FF3.5, but few other ones.

See <a href="http://hacks.mozilla.org/2009/07/working-smarter-not-harder/" rel="nofollow noreferrer">http://hacks.mozilla.org/2009/07/working-smarter-not-harder/</a>

blocks|key|1409319|text|当一个页面加载时，它一次只能并行下载2个javascript文件，所以尽量减少javascript文件的数量和大小(使用最小化、遮蔽功能和GZipping)将有助于提高加载体验。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1409320|在javascript中使用回调也有助于在javascript运行时项目是非阻塞的。|1409321|在jQuery中的一个例子是|1409322|$('#id').click(function(){
++$.post('url',data,function(callbackdata){//do+something
+++++++++});

});|code-block|syntax|javascript|1409323|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|O|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|P|8|@]|9|@]|A|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

When a page is loading it can only download 2 javascript files in parallel at any one time so trying to keeping the number of javascript files down and their size down (with Minification,obsfucation and GZipping) will help with the loading experience.

Using callbacks in your javascript will also help with items being non-blocking when javascript is running.

An example in jQuery would be

<pre><code>$('#id').click(function(){
 $.post('url',data,function(callbackdata){//do something
 });

});
</code></pre>

blocks|key|1089455|text|稍有延迟的setTimeout将允许您的控制流继续进行，同时调度另一个函数稍后执行。这对于防止UI阻塞或无意中依赖于其他函数的成功执行特别有用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1089456|我发现防止javascript错误干扰绑定事件是非常有用的。例如，要在表单上安装提交处理程序：|1089457|$('#form').submit(function()+{
++setTimeout(function()+{
++++//+Submit+handler+function,+i.e.+do+an+ajax+submission+of+the+form
++++$.ajax(...etc...);
++},+1);
++//+Return+false+before+the+handler+executes,+ensuring+the+form+won't+manually+submit
++//+in+the+event+of+a+js+error+in+the+handler
++return+false;
});|code-block|syntax|javascript|1089458|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

setTimeout with a small delay will allow your control flow to proceed while scheduling another function to execute later. This is especially useful to prevent the UI from blocking or being inadvertently dependent on the successful execution of the other function.

I find it very useful to prevent javascript errors from interfering with bound events. For example, to install a submit handler on a form:

<pre><code>$('#form').submit(function() {
 setTimeout(function() {
 // Submit handler function, i.e. do an ajax submission of the form
 $.ajax(...etc...);
 }, 1);
 // Return false before the handler executes, ensuring the form won't manually submit
 // in the event of a js error in the handler
 return false;
});
</code></pre>

blocks|key|1407496|text|如果您有一些JavaScript不是立即加载的关键，那么Deferring+execution+of+JavaScript是一个非常好的解决方案。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1407497|entityMap|0|LINK|mutability|MUTABLE|url|http://www.websiteoptimization.com/speed/tweak/defer/^0|S|X|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

<a href="http://www.websiteoptimization.com/speed/tweak/defer/" rel="nofollow noreferrer">Deferring execution of JavaScript</a> can be a really good solution if you have some JavaScript that is not critical to have loaded immediately.

blocks|key|107172|text|看看这个jQuery+plugin+(http://code.google.com/p/funky-jq-plugins/wiki/nonblocking)。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|107173|它的目标是使用计时器来模拟多线程环境，在这种环境中，UI线程不会因为长列表迭代等苛刻的操作而冻结。非常酷的东西。我写的:)|107174|Ciao现在|107175|entityMap|0|LINK|mutability|MUTABLE|url|http://code.google.com/p/funky-jq-plugins/wiki/nonblocking|1^0|4|D|0|J|1M|1|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]|$A|U|B|V|1|W]]|C|$]]|$1|D|3|E|5|6|7|X|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|Y|8|@]|9|@]|C|$]]|$1|H|3|-4|5|6|7|Z|8|@]|9|@]|C|$]]]|I|$J|$5|K|L|M|C|$N|O]]|P|$5|K|L|M|C|$N|O]]]]

Have a look at this <a href="http://code.google.com/p/funky-jq-plugins/wiki/nonblocking" rel="nofollow">jQuery plugin</a> (http://code.google.com/p/funky-jq-plugins/wiki/nonblocking). 

It aims at using timers to emulate a multi-threaded environment where the UI thread is not frozen by demanding operations like iteration over long lists. Very cool stuff ... I wrote it :)

Ciao for now

I am wondering if it is possible to load javascript in a way in which it does not block the user experience. I am not sure how to achieve the same, but I am looking for a cross-browser solution. I am wondering if someone can guide me in the right direction. Placing the js at the bottom of the page does not work too well.

Thank you for your time.

Non-blocking Javascript

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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我想知道是否有可能以一种不阻碍用户体验的方式加载javascript。我不确定如何实现同样的目标，但我正在寻找一个跨浏览器的解决方案。我想知道是否有人能给我指引正确的方向。将js放在页面的底部并不能很好地工作。谢谢您抽时间见我。

问非阻塞Javascript
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回答 7

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