Run away button.
var btn = new RunAwayBtn({
$el: $('#run-away-btn'),
xMargin: 50,
yMargin: 50
});
btn.on('jump', function () {
console.log('jump');
});
btn.on('jump:4', function () {
alert('this is 4th jump!\nand, good bye.');
btn.jumpTo(-100, -100);
});