JavaScript basic syntax

JavaScript can be written directly in an HTML file, for example:

<script rype= "Text/javascript" >

Alert ("HELLO World");

</script>

JavaScript can also be written outside, and then introduced in HTML header information, such as:

<script type= "Text/javascript" src= "Js/hello.js" ></script>

In JavaScript, variables are defined using the var definition, functions using function () {}, support If...else ... and switch branches, support for and while loops.

JavaScript basic syntax