Seriously, two days is about enough to get a feel for the basics. It's nowhere near enough time to get to "professional" level (whatever that means exactly). The more experience you have with other languages, the easier it will be, though.
Go through video lectures by Douglas Crockford at http://yuiblog.com/crockford/. You could be able to get rid of some assumptions, misconceptions and pick up some really good concepts in less than 10 hrs of video.
Nevertheless, it is indeed a great place to start.
If you need to learn JavaScript, you can follow these courses if you have little previous programming experience. They are interactive and you can code all the examples in the explorer (and they are free).
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说真的，两天的时间足以让你了解基础知识。距离达到“专业”水平（无论这到底意味着什么）还远远不够。不过，您对其他语言的经验越多，就越容易。
Seriously, two days is about enough to get a feel for the basics. It's nowhere near enough time to get to "professional" level (whatever that means exactly). The more experience you have with other languages, the easier it will be, though.
观看 Douglas Crockford 的视频讲座，网址为 http://yuiblog.com/crockford/。您可以在不到 10 小时的视频中摆脱一些假设、误解并获得一些真正好的概念。
尽管如此，这确实是一个很好的起点。
Go through video lectures by Douglas Crockford at http://yuiblog.com/crockford/. You could be able to get rid of some assumptions, misconceptions and pick up some really good concepts in less than 10 hrs of video.
Nevertheless, it is indeed a great place to start.
http://eloquentjavascript.net/
另请参阅https://stackoverflow.com/questions/4744906/would-you-recommend-starting-from-html5-css3-for-beginners 有关学习网络技术的资源。
http://eloquentjavascript.net/
See also https://stackoverflow.com/questions/4744906/would-you-recommend-starting-from-html5-css3-for-beginners for resources on learning web technologies.
不要临时抱佛脚学习编程语言，尤其是专业学习它，除非您以前有编程经验。
Don't cram for a programming language, especially learning it professionally, unless you have previous programing experience.
本文是最新、现代 JavaScript 资源的重要来源：
http: //blog.reybango.com/2010/12/15/what-to-read-to-get-up-to-speed-in-javascript/
This article is a great source of up to date, modern JavaScript resources:
http://blog.reybango.com/2010/12/15/what-to-read-to-get-up-to-speed-in-javascript/
如果您需要学习 JavaScript，并且您之前几乎没有编程经验，则可以学习这些课程。它们是交互式的，您可以在资源管理器中编写所有示例（并且它们是免费的）。
1 - JavaScript 基础知识
2 - JavaScript
最后，一个名为 jQuery 的库可以使 JavaScript 编程变得更容易。
3 - jQuery
这不会花费您几天的时间，但对于成为 JavaScript 工程师来说是一个良好的开始。
祝你好运。
If you need to learn JavaScript, you can follow these courses if you have little previous programming experience. They are interactive and you can code all the examples in the explorer (and they are free).
1 - JavaScript Fundamentals
2 - JavaScript
And finally, a library called jQuery to make a little bit easier JavaScript programming.
3 - jQuery
This won't take you to days, but is a good beginning to be a JavaScripter.
Good luck.