The chances that you will need JavaScript as a web developer are really high. So it's a good idea to at least know the basics.
I know just enough JavaScript to do my work and build personal projects. I can build a simple back-end, though I wouldn't use JavaScript for that. I'm happier with something like Grails or Rails.
In terms of front-end, knowing the DOM and Web APIs is enough most of the time. Sure, there are frameworks that force you to learn some new concepts, but in the end it's a framework; it guides you on how you should do things.
Learning JavaScript to build a standalone library or framework is a whole different story.
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The chances that you will need JavaScript as a web developer are really high. So it's a good idea to at least know the basics.
I know just enough JavaScript to do my work and build personal projects. I can build a simple back-end, though I wouldn't use JavaScript for that. I'm happier with something like Grails or Rails.
In terms of front-end, knowing the DOM and Web APIs is enough most of the time. Sure, there are frameworks that force you to learn some new concepts, but in the end it's a framework; it guides you on how you should do things.
Learning JavaScript to build a standalone library or framework is a whole different story.