function actsAsDecorator(object) {
object.setupDecoratorFor = function(method) {
if (! ('original_' method in object) ) {
object['original_' method] = object[method];
object['before_' method] = [ ];
object['after_' method] = [ ];
object[method] = function() {
var i;
var b = this['before_' method];
var a = this['after_' method];
var rv;
for (i = 0; i < b.length; i ) {
b[i].call(this, arguments);
}
rv = this['original_' method].apply(this, arguments);
for (i = 0; i < a.length; i ) {
a[i].call(this, arguments);
}
return rv;
}
}
};
object.before = function(method, f) {
object.setupDecoratorFor(method);
object['before_' method].unshift(f);
};
object.after = function(method, f) {
object.setupDecoratorFor(method);
object['after_' method].push(f);
};
}
/**
Invoking
*/
function Test(){
this.say1 = function(s){
alert(s);
}
this.say2 = function(s){
alert(s);
}
}
var t = new Test();
actsAsDecorator(t);
t.before("say1",beforeHander);
t.after("say2",afterHander);
test();
Statement:The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn