javascript 继承父构造函数参数
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Inherit parent constructor arguments
提问by Jem
I'm browsing the discussion for a similar topic, but can't find my situation...
我正在浏览类似主题的讨论，但找不到我的情况...
Am trying call parent constructors with parameters... can't seem to get it right.
我正在尝试使用参数调用父构造函数...似乎无法正确处理。
I have a PhysicsBodysuperclass that takes aNodeas its only constructor argument:
我有一个PhysicsBody超类，它aNode作为它唯一的构造函数参数：
function PhysicsBody(aNode) {
this.userData = aNode;
// ...
}
Of this PhysicsBodyinherits a DynamicBodyclass. Is constructor also takes aNodeas only argument... Like I would do it in Java, I'd love to call something equivalent to "super(aNode");Can't seem to find out how.
其中PhysicsBody继承了一个DynamicBody类。构造函数是否也aNode作为唯一的参数......就像我在 Java 中所做的那样，我很想调用与"super(aNode");无法找到方法等效的东西。
Here's the DynamicBodyclass:
这是DynamicBody课程：
// Wanted to give "new PhysicsBody(this, aNode)", but that fails!
DynamicBody.prototype = new PhysicsBody();
DynamicBody.prototype.constructor=DynamicBody;
function DynamicBody(aNode) {
// calling the parent constructor fails too:
// PhysicsBody.prototype.constructor.call(this, aNode);
//...
}
回答by ?ime Vidas
One way to do it:
一种方法：
function PhysicsBody( aNode ) {
this.userData = aNode;
}
PhysicsBody.prototype.pbMethod = function () {};
function DynamicBody( aNode ) {
PhysicsBody.call( this, aNode );
}
// setting up the inheritance
DynamicBody.prototype = Object.create( PhysicsBody.prototype );
DynamicBody.prototype.dbMethod = function () {};
Now, when you do
现在，当你做
var pb = new PhysicsBody( '...' );
the instance pbgets a userDataproperty and also inherits the methods from PhysicsBody.prototype(pbMethodin this case).
该实例pb获取一个userData属性，并从PhysicsBody.prototype(pbMethod在这种情况下)继承方法。
When you do
当你做
var db = new DynamicBody( '...' );
the instance dbgets a userDataproperty and also inherits the methods from DynamicBody.prototype(dbMethodin this case), which in turn inherits from PhysicsBody.prototype.
该实例db获取一个userData属性，并从DynamicBody.prototype(dbMethod在本例中)继承方法，后者又从PhysicsBody.prototype.
回答by pimvdb
If I understand you correctly, by saying you want to inherit the parent constructor arguments, you mean that new DynamicBody(1, 2, 3)will internally call PhysicsBody(1, 2, 3)for the DynamicBodyinstance.
如果我理解正确的话，说要继承父构造函数的参数，你的意思是new DynamicBody(1, 2, 3)将内部调用PhysicsBody(1, 2, 3)的DynamicBody实例。
This can be accomplished by using .applyand passing argumentsalong: http://jsfiddle.net/pmkrQ/.
这可以通过使用.apply和传递arguments：http: //jsfiddle.net/pmkrQ/来完成。
function DynamicBody() {
PhysicsBody.apply(this, arguments);
}
