Property Attributes The object property contains four attributes. value− A value of the object. enumerable− Contains boolean value representing whether the object is iterable. configurable− Contains the boolean value representing whether the object is configurable. ...
// 对于foo.bar()的 Reference 是: var BarReference = { base: foo, propertyName: 'bar', strict: false } 例子分析——第二步: foo.bar() // ref = foo.bar ——> ref的base,name,strict都有吗? // 都有:{ base: foo, propertyName: 'bar', strict: false }。——> 是Reference ;`(...
Constructor:保存着用于创建当前对象的函数。构造函数(constructor)就是Object(). hasOwnProperty(propertyName):用于检查给定的属性在当前对象实例中(而不是在实例的原型中)是否存在。比如:hasOwnProperty("name")。 isPrototypeOf(object):用于检查传入的对象是否是另一个对象的原型。 PropertyIsEnumerable(propertyName):...
};let yourCar =Object.create( myCar );console.log( yourCar.name );// Ford Escort Object.create也允许我们简单的继承先进的概念,比如对象能够直接继承自其它对象,这种不同的继承.我们早先也看到Object.create允许我们使用 供应的第二个参数来初始化对象属性。例如: let vehicle = {getModel:function () {...
=true][init.callee.property.type="Identifier"][init.callee.optional!=true]:matches([init.callee.property.name="from"],[init.callee.property.name="of"])[init.callee.object.type="Identifier"][init.callee.object.name="Array"],[init.type="CallExpression"][init.optional!=true][init.callee....
// Two slashes start single-line commentsvarx;// declaring a variablex=3+y;// assigning a value to the variable `x`foo(x,y);// calling function `foo` with parameters `x` and `y`obj.bar(3);// calling method `bar` of object `obj`// A conditional statementif(x===0){// Is...
BaseObject=function(name) {if(typeofname !=="undefined") {this.name= name; } };BaseObject.prototype.name='default'; With this version,BaseObjectinherits thenameproperty from itsprototypeobject, where it is set (by default) to'default'. Thus, if the constructor is called without a name,...
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letperson =window.prompt("Enter your name");if(person !=null) {console.log('Hello', person);} 7. == 和 === 有什么区别? == 比较值 === 比较值和类型 例子: varx =100;vary ="100"; (x == y)// --> true because the value of ...
The constructor data property of an Object instance returns a reference to the constructor function that created the instance object. Note that the value of this property is a reference to the function itself, not a string containing the function's name.