new playground api interpreter

gistfile1.txt

<input type="button" value="Stop" id="stop">
<div id="log"></div>
<script src="go/doc/jquery.js"></script>
<script>
var script = [
	{"Delay": 0, "Message": "Hello, "},
	{"Delay": 1000000000, "Message": "World!\n"},
	{"Delay": 2000000000, "Message": "That's it!"}
];
function playback(root, script) {
	var pre = $('<pre></pre>').appendTo(root);
	var timeout;
	var next = function() {
		if (script.length == 0) {
			return;
		}
		var msg = script.shift();
		timeout = setTimeout(function() {
			pre.text(pre.text() + msg.Message);
			next();
		}, msg.Delay / 1000000);
	}
	next();
	return function() {
		clearTimeout(timeout);
	}
}
$("#stop").click(playback("#log", script));
</script>