| // Object.prototype.hasOwnProperty |
| |
| function MyClass() |
| { |
| this.y = 2; |
| } |
| |
| MyClass.prototype = { x : 1 }; |
| |
| var sub = new MyClass(); |
| shouldBe("sub.x","1"); |
| shouldBe("sub.y","2"); |
| shouldBe("sub.hasOwnProperty('x')","false"); |
| shouldBe("sub.hasOwnProperty('y')","true"); |
| sub.x = 6; |
| shouldBe("sub.x","6"); |
| shouldBe("sub.hasOwnProperty('x')","true"); |
| delete sub.y; |
| shouldBe("sub.y","undefined"); |
| shouldBe("sub.hasOwnProperty('y')","false"); |
| |
| |
| |
| // Object.prototype.isPrototypeOf |
| |
| function Class1() {} |
| function Class2() {} |
| function Class3() {} |
| |
| Class1.prototype = new Object(); |
| Class1.prototype.hasClass1 = true; |
| Class2.prototype = new Class1(); |
| Class2.prototype.hasClass2 = true; |
| Class3.prototype = new Class2(); |
| Class3.prototype.hasClass3 = true; |
| |
| var obj = new Class3(); |
| shouldBe("obj.hasClass1","true"); |
| shouldBe("obj.hasClass2","true"); |
| shouldBe("obj.hasClass3","true"); |
| |
| shouldBe("Class1.prototype.isPrototypeOf(obj)","true"); |
| shouldBe("Class2.prototype.isPrototypeOf(obj)","true"); |
| shouldBe("Class3.prototype.isPrototypeOf(obj)","true"); |
| shouldBe("obj.isPrototypeOf(Class1.prototype)","false"); |
| shouldBe("obj.isPrototypeOf(Class2.prototype)","false"); |
| shouldBe("obj.isPrototypeOf(Class3.prototype)","false"); |
| |
| shouldBe("Class1.prototype.isPrototypeOf(Class2.prototype)","true"); |
| shouldBe("Class2.prototype.isPrototypeOf(Class1.prototype)","false"); |
| shouldBe("Class1.prototype.isPrototypeOf(Class3.prototype)","true"); |
| shouldBe("Class3.prototype.isPrototypeOf(Class1.prototype)","false"); |
| shouldBe("Class2.prototype.isPrototypeOf(Class3.prototype)","true"); |
| shouldBe("Class3.prototype.isPrototypeOf(Class2.prototype)","false"); |
| |
| shouldBeUndefined("Class1.prototype.prototype"); |
| |
| function checkEnumerable(obj,property) |
| { |
| for (var propname in obj) { |
| if (propname == property) |
| return true; |
| } |
| return false; |
| } |
| |
| function myfunc(a,b,c) |
| { |
| } |
| myfunc.someproperty = 4; |
| |
| shouldBe("myfunc.length","3"); |
| shouldBe("myfunc.someproperty","4"); |
| shouldBe("myfunc.propertyIsEnumerable('length')","false"); |
| shouldBe("myfunc.propertyIsEnumerable('someproperty')","true"); |
| shouldBe("checkEnumerable(myfunc,'length')","false"); |
| shouldBe("checkEnumerable(myfunc,'someproperty')","true"); |