In this chapter, I'd like to talk about a very important topic. Basically, JavaScript is a language that operates on HTML. That is how JavaScript was created. So in this video, I will explain how to squeeze JavaScript into HTML, which has a completely different lexical grammar. In other words, how to rendezvous them successfully. This is an important topic. I'm going to select New File to create a new file and name it ex1. It's just a random name. And then I created the basic HTML code like this. And over here, I'm going to add JavaScript. First, let's open the page. Over here. Select ex. There we go. The first thing you need to do to add JavaScript is using HTML code to state that JavaScript starts now. And for that purpose, we use a <script> tag. In HTML, JavaScript code must be inserted between <script> tags. So, the web browser interprets code between <script> as JavaScript. Let me show you. I'm typing in document.write. And then over here, I'm going to type in...

hello world and save it. Let's reload the page. 1, 2, 3. hello world shows up, as you can see. At this point, you might wonder - I added and JavaScript. But what's the difference? How is it different from typing in HTML and then hello world in the next line? That's completely a reasonable question. Why? Because the results are the same! But there is a difference, and I'm going to explain now. In HTML, 1+1 outputs 1+1 forever. Let me reload it. See? On the other hand, JavaScript is a dynamic language. It is quite versatile as it can even be used to perform tasks of a calculator. Let's reload the page. 1, 2, 3. Ta-da! The number 2 is displayed. So JavaScript has the ability to calculate 1 plus 1, get the result which is the number 2, and display it to the screen. On the other hand, HTML is a static language.

it cannot perform such functions. Did you get it? So, this is it for the topic. What's important here is... 1 + 1, or document.write, these kinds of things are not important. Please ignore what this dot means. What's important is this one here is JavaScript code, and we should use document.write to return a certain text to a web page. You don't need to feel pressured to understand the rules. It's sufficient as long as you get what I've just explained. All you need to remember is this: To let the web browser know this line is JavaScript, we use <script> tag.

WEB2 JavaScript - 3.HTML과 JS의 만남 : script 태그

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WEB2 JavaScript - 3.HTML과 JS의 만남 : script 태그

WEB2 JavaScript - 3.HTML과 JS의 만남 : script 태그

Scripts