Insert a button on a page with random number generation

all thing you have to do is use javaScript function

JavaScript Example:

var random_number = function(){
    return Math.floor(Math.random() * 10000) + 1;
};
document.getElementById('button_text').onclick = function () {
    document.getElementById("input_box").innerHTML = random_number();
};

jQuery Example:

$.randomBetween(0,10000);