复制代码 代码如下:

var SDelegate = function(f, b, c) {

if (b) {

this.asFunction_ = function() {

return f.apply(b, arguments);

}

} else {

this.asFunction_ = function() {

return f.apply(this, arguments);

}

}

this.method_ = f;

this.binding_ = b;

this.continus = c;

}

SDelegate.composite = function(d) {

if (d.continus) {

var con = d.continus.composited_ = SDelegate.composite(d.continus);

var method = d.asFunction_;

return function() {

con.apply(this, arguments);

return method.apply(this, arguments);

}

} else {

return d.asFunction_;

}

}

SDelegate.prototype.call = function() {

if (!this.composited_) this.composited_ = SDelegate.composite(this);

return this.composited_.apply(arguments[0], Array.prototype.slice.call(arguments, 1));

}

SDelegate.prototype.remove = function() {

var removeP = function(parent, item, test, data) {

if (!item) return;

parent.composited_ = item.composited_ = null;

if (test(item, data)) {

parent.continus = item.continus;

removeP(parent, item.continus, test, data);

} else {

removeP(item, item.continus, test, data);

}

};

return function(test, data) {

var p = this;

if (test(this, data)) {

p = this.continus;

}

removeP(p, p.continus, test, data);

p.composited_ = null;

return p;

}

}();

SDelegate.prototype.append = function(f, b) {

return new SDelegate(f, b, this);

}

这个SDelegate用起来可能会比较诡异，比如很多操作都要重新赋值。Dess中，SDelegate主要用于一些特定场合，如DOM事件派发。