Free JavaScript tutorial
Math object is an important JavaScript object because it can be used to perform web-based mathematical calculations. It can compute data input by the user and then displays its output on the web page. It is very useful for programmer to design online applications that involve calculations and games. We will see examples that use Math object in later lessons. There are various methods and properties of the math object which we can use to perform mathematical calculations.
The date object is used to manipulate and display date and time. The Methods associated with the date object are getDate, getDay, getHours, getMinutes, getSeconds, getYear and more. Each of these methods returns the current time value associated with the method name. For example, getDate will return the current while get minutes will return the current minutes
It is possible to add multimedia contents to a website using JavaScript. Among them, video and music are the commonest.
To play background music, you can use the following code:
PlayMusic.src=”mj.mp3″;
Check out the full script here:
There are many types of decision-making procedures in JavaScript , one of them is looping. Looping is a procedure whereby the execution is repetitive and will only terminate until a certain condition(s) is met. There are two kinds of loops, the for loop and the while loop.
We have learned how to use the If and Else keywords together with comparison and logical operators in previous lesson, now we will learn how to use conditional operators without using If and Else. Conditional operators let JavaScript program executes certain jobs according to certain conditions.
The format of the conditional operator is
Conditional Expression ? Execution 1: Execution 2