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04-JAVASCRIPT

JavaScript

  • JavaScript is the world’s most popular programming language.
  • JavaScript was initially created to “make web pages alive”.
  • JavaScript is a lightweight, interpreted programminglanguage.
  • JavaScript is dynamically-typed language, i.e. it performs type checking at runtime. This means that scripts written in dynamically-typed languages can compile even if they contain errors that will prevent the script from running properly (if at all).
  • It is a full-fledged programming language that enables dynamic interactivity on websites when applied to an HTML document.
  • JavaScript ≠ Java

Linking JavaScript to HTML document:

  1. Internally
  2. Externally

Linking JavaScript Internally:

JavaScript can be linked internally using <script> tag in same HTML document.

<html>
  <head>
    <title>JavaScript</title>
    <script>
         <!--
            JavaScript Code......!
         -->
      </script> 
  </head>
  <body>   
           
  </body>
</html>

Linking JavaScript Externally:

Scripts can also be placed in external files.

index.html

<html>
  <head>
    <title>JavaScript</title>
    <script>
         <!--
            JavaScript Code......!
         -->
      </script> 
  </head>
  <body>   
           
  </body>
</html>

myScript.js

//JavaScript Code......!


alert("Hello World!");