How Do You Access Global Var In Javascript?

JavaScript variables are similar to variables in any other programming language; they hold values that you use in your application. JavaScript enables you to name your case-sensitive variables so you may reference them elsewhere in your code.You can name variables anything you wish.You may opt to use descriptive names such asnumber_of_times_clicked, or short, generic names such as foo. The only restrictions on variable names is that they must begin with a letter or underscore (_).

.JavaScript variables can contain the following different types of values:

• numbers, for example, 14 or 1.25
• logicals (Boolean), can be True or False
• strings, for example, Hello World

JavaScript also recognizes the null keyword for specifying null values for variables. JavaScript has reduced the confusion in deciding which data type to use for different types of numbers. JavaScript uses a single data type for numbers, which means that a JavaScript number can contain the equivalent of integers, reals, and doubles without the need for specialized types. In addition, JavaScript handles Date objects with this same data type, further simplifying code development under JavaScript.

The var statement is used to declare variables in JavaScript. Each variable is given a name and optionally an initial value. Outside of a function, the var statement is optional, but it is highly recommended that you always use var to avoid the possibility of overwriting local variables with global variables. Local variables are generally declared within a function with the intention that only the function will be able to use the variable. Global variables are declared outside of any function, making the variable available to any function.

How do I write a the following program using Math.random()?  How much is 6 * 7?  The student then types the answer into a text field. The program check the student's answer.  If the answer is correct, display the string