javascript-patterns/function-patterns/callbacks-and-scope.html at master · JavaProductions/javascript-patterns · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
<!doctype html>
<html lang="en">
	<head>
		<title>JavaScript Patterns</title>
		<meta charset="utf-8">
	</head>
	<body>
		<script>
			var myapp = {};
			myapp.color = "green";
			myapp.paint = function (node) {
				node.style.color = this.color;
			};

			var findNodes = function (callback) {
				// ...
				if (typeof callback === "function") {
					callback(found);
				}
				// ...
			};

			var findNodes = function (callback, callback_obj) {
				// ...
				if (typeof callback === "function") {
					callback.call(callback_obj, found);
				}
				// ...
			};

			var findNodes = function (callback, callback_obj) {
				if (typeof callback === "string") {
					callback = callback_obj[callback];
				}

				// ...
				if (typeof callback === "function") {
					callback.call(callback_obj, found);
				}
				// ...
			};
		</script>
	</body>
</html>