...關(guān),如果newTarget.prototype存在,且是Object對象,則this就是ObjectCreate(newTarget.prototype),ObjectCreate是Object.create內(nèi)部調(diào)用的方法,如果newTarget.prototype不存在或者不是Object對象,this相當于ObjectCreate(Object.prototype)。 function ...
...TypeError exception. Let constructorParent be superclass. 7. Let proto be ObjectCreate(protoParent). ... 12. Let constructorInfo be the result of performing DefineMethod for constructor with argu...
...rototype) 這時候不會報錯了,補上Object.create的polyfill function objectCreate (proto) { function F() {} F.prototype = proto; return new F(); } 然而還有一點小漏洞,當我們查看wangcai.constructor時,會發(fā)現(xiàn)指向的是Animal。因此我們需要修復一下...
...100; } A.prototype.getX=function(){ console.log(this.x); } B.prototype=objectCreate(A.prototype); B.prototype.constructor=B; var n=new B; n.getx(); function objectCreate(o){ function Fn(){ ...
...ype(O) is neither Object nor Null, throw a TypeError exception. Let obj be ObjectCreate(O). If the argument Properties is present and not undefined, then Return ObjectDefineProperties(obj, Properti...
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