老实说,我对这个有点不知所措。任何帮助,将不胜感激。
客观的
我想调用一个名为 restart 的函数,但该函数位于对象内部并被传递给函数Class.extend
。
我正在使用的代码是
var Chickenz = Class.extend(
{
init: function(value)
{
//do something
},
// restart game
restart: function()
{
this.score.restart();
//etc
}
});
我尝试了什么?
restart();
不工作。我得到TypeError: restart is not a function
了 没什么大不了的,我没想到它会起作用。基于这个问题>
Javascript - 在对象中存储函数 - 不好的做法?
我以为我可以做类似Chickenz.restart();
的事情,但它更复杂,因为 Class.extend
我在这个问题的底部包含了 Class.extend 的代码。
稍后使用以下代码调用重新启动函数
/* GUI Events */
// restart button
addEvent($("restart"), "click", function() {
self.restart();
return false;
});
我以为我会尝试self.restart();
,但没有奏效-TypeError: self.restart is not a function.
所以我的问题。
如何调用重启功能?
Class.extend 的代码
var initializing = false;
// The base Class implementation (does nothing)
this.Class = function(){};
// Create a new Class that inherits from this class
// Create a new Class that inherits from this class
Class.extend = function(prop) {
var _super = this.prototype,
prototype,
name,
tmp,
ret;
// Instantiate a base class (but only create the instance,
// don't run the init constructor)
initializing = true;
prototype = new this();
initializing = false;
// Copy the properties over onto the new prototype
for ( name in prop ) {
// Check if we're overwriting an existing function
prototype[name] = typeof prop[name] == "function" &&
typeof _super[name] == "function" ?
(function(name, fn){
return function() {
tmp = this._super;
// Add a new ._super() method that is the same method
// but on the super-class
this._super = _super[name];
// The method only need to be bound temporarily, so we
// remove it when we're done executing
ret = fn.apply(this, arguments);
this._super = tmp;
return ret;
};
})(name, prop[name]) :
prop[name];
}
// The dummy class constructor
//Changed according to http://ejohn.org/blog/simple-class-instantiation/
//Use the new operator to instantiation
function Class(args){
if ( this instanceof arguments.callee ) {
if ( !initializing && this.init )
this.init.apply( this, args.callee ? args : arguments );
} else
return new arguments.callee( arguments );
};
// Populate our constructed prototype object
Class.prototype = prototype;
// Enforce the constructor to be what we expect
Class.constructor = Class;
// And make this class extendable
Class.extend = arguments.callee;
return Class;
};