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var NO_TOPIC = -1;
var Topic;
function Handler(s, t) {
this.successor = s || null;
this.topic = t || 0;
}
Handler.prototype = {
handle: function () {
if (this.successor) {
this.successor.handle()
}
},
has: function () {
return this.topic != NO_TOPIC;
}
};
var app = new Handler({
handle: function () {
console.log('app handle');
}
}, 3);
var dialog = new Handler(app, 1);
var button = new Handler(dialog, 2);
button.handle();
var app = new Handler({
handle: function () {
console.log('app handle');
}
}, 3);
var dialog = new Handler(app, 1);
dialog.handle = function () {
console.log('dialog before ...')
// 这里做具体的处理操作
console.log('dialog after ...')
};
var button = new Handler(dialog, 2);
button.handle();
Handler.prototype.handle.call(this);var app = new Handler({
handle: function () {
console.log('app handle');
}
}, 3);
var dialog = new Handler(app, 1);
dialog.handle = function () {
console.log('dialog before ...')
// 这里做具体的处理操作
Handler.prototype.handle.call(this); //继续往上走
console.log('dialog after ...')
};
var button = new Handler(dialog, 2);
button.handle = function () {
console.log('button before ...')
// 这里做具体的处理操作
Handler.prototype.handle.call(this);
console.log('button after ...')
};
button.handle();