javascript muito básico.

variáveis

var varString = "abc";
var varNumber = 123;
var varArray = ["abc",123];

função

var varFunction = function ()
{
    code code code;
};

controle de fluxo

// if-else
if (condition) {
    code code code;
} else if {
    code code code;
} else {
    code code code;
}
//while
while (condition) {
    code code code;
}
//do-while
do {
    code code code;
} while (condition)
//for
for (initial ; condition ; incrementor) {
    code code code;
}

Matemática

var NumberSeven = Math.floor(7.14);
var RandomBetweenZeroAndOne = Math.randome();
//A random number between 1 and 10
var randomNumber = Math.floor(Math.random() * 9 + 1);

oo

//Literal notation
var varObject = function () {
    this.property1= property1;
    this.property2 = property2;
    this.method = function () {
        code code code;
        code code code;
    }
};

//Constructor notation
var varObject = new Object();
varObject.property1 = property1;
varObject.property2 = property2;
varObject.method = function () {
    code code code;
    code code code;
}