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tutorial.js
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tutorial.js
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document.onkeydown = checkKey;
var ball = document.getElementById("ball");
var ballStartCoords = getCoords(ball);
function getCoords(element) {
var top = 11, left = 7;
return {
top: top,
left: left
};
};
function checkKey(e) {
e = e || window.event;
var distance = 12;
if (e.keyCode == '38') {
ballStartCoords.top = ballStartCoords.top - distance;
ball.style.top = ballStartCoords.top + "px";
// up arrow
}
else if (e.keyCode == '40') {
ballStartCoords.top = ballStartCoords.top + distance;
ball.style.top = ballStartCoords.top + "px";
// down arrow
}
else if (e.keyCode == '37') {
ballStartCoords.left = ballStartCoords.left - distance;
ball.style.left = ballStartCoords.left + "px";
// left arrow
}
else if (e.keyCode == '39') {
ballStartCoords.left = ballStartCoords.left + distance;
ball.style.left = ballStartCoords.left + "px";
// right arrow
}
}