added chain of responsibility pattern

chuanxshi · chuanxshi · commit 758320a2ce37 · 2011-12-20T03:59:03.000+08:00
diff --git a/design-patterns/chain-of-responsibility.html b/design-patterns/chain-of-responsibility.html
@@ -0,0 +1,61 @@
+﻿<!doctype html>
+<html lang="en">
+<head>
+<title>JavaScript Patterns</title>
+<meta charset="utf-8">
+</head>
+<body>
+<script>
+// from https://gist.github.com/1174982
+
+var NO_TOPIC = -1;
+var Topic;
+
+function Handler(s, t) {
+    this.successor = s || null; 
+    this.topic = t || 0;
+}
+
+Handler.prototype = {
+    handle: function () {
+        console.log(this.has())
+        if (this.successor) {
+            this.successor.handle()
+        }
+        console.log(this.topic);
+    },
+    has: function() {
+        return this.topic != NO_TOPIC;
+    }
+};
+
+var _handle = Handler.prototype.handle;
+
+var app = new Handler({
+    handle: function () {
+        console.log('app handle');
+    }
+}, 3);
+
+var dialog = new Handler(app, 1);
+//dialog.handle = function () {
+    //if (this.has()) {
+    //} else {
+        //console.log('dialog handle');
+        //_handle.call(this);
+    //}
+//}
+
+var button = new Handler(dialog, 2);
+//button.handle = function () {
+    //if (this.has()) {
+    //} else {
+        //console.log('dialog handle');
+        //_handle.call(this);
+    //}
+//}
+
+button.handle();
+</script>
+</body>
+</html>
