Javascript Get Random result with probability for specific array

Question

i have a array and i need to do it randomly show the output by probability below are my code

var shirts = [
                      [\"images/fantastic-logo.pn         


        

Answer 1

For a short array this should be enough, using getRandomInt from Mozilla Developers:

function getRandomInt(max) {
    return Math.floor(Math.random() * Math.floor(max));
}

var shirts = [
    ["images/fantastic-logo.png", "12.65"],
    ["images/fantastic-word.png", "10.00"],
    ["images/free-product.png", "15.50"]
];

var random = getRandomInt(100);
var selectedShirt;
if (random <= 50) {
    selectedShirt = shirts[0];
} else if (random > 50 && random < 75) {
    selectedShirt = shirts[1];
} else {
    selectedShirt = shirts[2];
}

$("#image").html($("").attr("src", shirts[selectedShirt][0]));
$(".price").html("$" + shirts[selectedShirt][1]);

Note that you can use less numbers like in Ray's answer. For a bigger array you may use a better approach.