if else if in javascript through a form code example

Example 1: javascript if else

var age=20;
if (age < 18) {
	console.log("underage");
} else {
	console.log("let em in!");
}

Example 2: using if statements in javascript

if (expression) {
   Statement(s) to be executed if expression is true
} else {
   Statement(s) to be executed if expression is false
}