How to make array choose four DIFFERENT options

Does anyone know how I can make my array, choose four different options?

var colors = ['#4286f4', '#e2f442', '#f48c41', '#41f4f4', '#dd3b3b', '#7a6f6f']
window.colorOne = '';
window.colorTwo = '';
window.colorThree = '';
window.colorFour = '';


function beginAndGetCombo(){

window.colorOne = colors[Math.floor(Math.random() * colors.length)];
window.colorTwo = colors[Math.floor(Math.random() * colors.length)];
window.colorThree = colors[Math.floor(Math.random() * colors.length)];
window.colorFour = colors[Math.floor(Math.random() * colors.length)];

}


<input type=button value='Get Colors' onclick='beginAndGetCombo()'>