javascript draw a image on canvas

Question

I try to build a javascript code, to draw a image on canvas, but I don\'t know where go wrong. That is my code:

Answer 1

The image is loading asynchronously. This code will work:

JavaScript:

function setup(){
    var canvas = document.getElementById('myCanvas');
    var ctx = canvas.getContext('2d');
    canvas.width = 800;
    canvas.height = 600;
    var image = new Image();
    image.onload = function () {
        ctx.drawImage(image,5,5);
    };
    image.src = 'a.png';
}
window.onload = setup;