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  • Once upon a time there was internet. You know, a bunch of computers all connected

  • by wires. One person on a computer can read documents from another person's computer using

  • a language called HTML. Each computer's web browser can properly display these

  • documents. Add CSS to the mix and you've got a beautifully-styled web page.

  • It is important to note that neither HTML nor CSS are programming languages. back in

  • Back in 1995 a few people at Netscape started to wonder, "What if there was a way to write

  • a computer program for the browser?"

  • This way, when HTML and CSS gets sent

  • from one computer to another

  • you can also send over some programming.

  • This code would run in someone's web

  • browser and create an even better user experience.

  • Thus JavaScript was born!

  • You're probably familiar with Twitter. They use a lot of JavaScript on their

  • web page to do things.

  • Such as opening up a tweet in a bigger window for instance

  • Also, any of the actions below a tweet will trigger some JavaScript to be run.

  • If I click the star to favorite a tweet JavaScript will tell the server,

  • "This tweet is now a favorite."

  • If I click on reply you can see the JavaScript

  • behavior at work yet again

  • it focuses on the expanded reply box.

  • All of this behavior is made possible by JavaScript

  • It's worth mentioning that Java is not JavaScript.

  • They are two separate programming languages.

  • JavaScript is not just for programming in the browser, but on servers, game programming,

  • databases, and even robots.

  • Yeah, robots! We're only limited by our imaginations.

  • Are you excited yet?

  • To get startedif you're new to these parts

  • please take a moment to play through our free five minute tutorial on JavaScript.com.

  • Or you can head over to our getting started page where we've curated a list of free

  • places to learn.

  • On our news page you can submit your own JavaScript news, read what other people

  • have posted,

  • subscribe to our weekly newsletter or listen to our podcast.

  • Welcome to the wonderful world of JavaScript.

  • We hope you enjoy your stay.

  • Awesome! Let's try it!

Once upon a time there was internet. You know, a bunch of computers all connected

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什麼是JavaScript? (What is JavaScript?)

  • 152 26
    HsuanLee 發佈於 2021 年 01 月 14 日
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