this.lastNamemeans thelastNameproperty ofperson. Accessing Object Methods You access an object method with the following syntax: objectName.methodName() If you invoke thefullName propertywith (), it will execute as afunction: Example name = person.fullName(); ...
object.prop:'default';prop;// => 'default' 当要检查的属性数量增加时,三元运算符语法的使用会变得艰巨。对于每个属性,你必须创建一个新的代码行来处理默认值,增加类似外观的三元运算符的丑陋墙。 为了使用更优雅的方法,让我们熟悉称为object destructuring的一个伟大的ES2015功能。[对象解构](https://developer...
2.2 Object (对象类型) Function (函数),特殊的对象,函数也可以被保存在变量中,并且像其他对象一样被传递。 Array ( 数组)类型 Date (日期) 代码语言:javascript 代码运行次数:0 运行 AI代码解释 vard=newDate();//1) 获得当前年份 d.getYear()//2) 获得年份的全称 d.getFullYear()//3) 获得月份 d....
functiondeepFreeze(object){Object.entries(object).forEach(([name,value]) => {if(value&&typeofvalue==='object') {deepFreeze(value);}});returnObject.freeze(object);} 现在,如果我们尝试更改内部对象的属性,则会出现错误。 deepFreeze(game);game....
在Design Patterns: Elements of Reusable Object Oriented Software这本书中有两个关于面向对象设计程序的原则: Program to an interface, not an implementation面向接口编程 Favor object composition over class inheritance优先使用组合,而非继承 在某种意义上,上边的第二个原则同样遵循了第一个原则,因为继承把父类暴...
varoBox = document.getElementById("box");//得到一个DOM对象oBox.xingming = "小明"; oBox.age= 12; oBox.sex= "男"; oBox.hobby= ["足球","刺绣","打麻将"]; console.log(oBox.hobby); console.log(typeofoBox);//object 通过DOM方法得到一个DOM对象,此时可以通过“.”点语法,给这个对象添加属性...
在Design Patterns: Elements of Reusable Object Oriented Software这本书中有两个关于面向对象设计程序的原则: Program to an interface, not an implementation面向接口编程 Favor object composition over class inheritance优先使用组合,而非继承 在某种意义上,上边的第二个原则同样遵循了第一个原则,因为继承把父类暴...
Related Methods: Object.keys()returns the keys (properties) of any object type. Object.values()returns the values of all object keys (properties). Object.entries()returns the keys and values of any object types. The methods above return anIterable(enumerable array). ...
The Object.getOwnPropertyDescriptors() method returns the property descriptors for all the properties of the given object. Example let obj = { value: 11, get number() { return this.value; }, }; // get property descriptors for all the properties of obj let objectProperties = Object.get...
object.getAttribute (propertyName [, flags]); You can find the related objects in the Supported by objects section below. Parameters: propertyName Required. String that specifies the name of the style property. Use the name of the corresponding JavaScript property (camelCase name) instead of ...