How does Javascript work?

...Javascript not Java often referred to as JS is a light weight,interpreted programming language that gives some interactivity instead of a static web page

interpreted vs compiled code

In interpreted programming languages,the code runs and the result is returned without transforming the code in a different form unlike c/c++ are compiled into machine code that is then run by the computer

The how..

 The web browser receives the JavaScript code in its original text form and runs the script from that

summary

Javascript runs in the browser ....