本机对象和宿主对象之间有什么区别？ [英] What is the difference between native objects and host objects?

问题描述

后者是否只是引用由自定义构造函数创建的非原始函数对象（例如，var bird1 = new Bird（）;）？

Does the latter simply refer to nonprimitive function objects that were created by a custom constructor (e.g., var bird1 = new Bird();)?

推荐答案

这两个术语都在ECMAScript规范中定义：

Both terms are defined in the ECMAScript specification:

原生对象

$ b ECMAScript实现中的$ b

对象，其语义完全由
定义，而不是由主机环境定义。

native object

object in an ECMAScript implementation whose semantics are fully defined by this specification rather than by the host environment.

注意标准本机对象是定义的在本说明书中。一些
本机对象是内置的;其他可能是在
执行ECMAScript程序的过程中构建的。

NOTE Standard native objects are defined in this specification. Some native objects are built-in; others may be constructed during the course of execution of an ECMAScript program.

来源： http://es5.github.com/#x4.3.6

主机环境提供的对象，用于完成ECMAScript的
执行环境。

host object

object supplied by the host environment to complete the execution environment of ECMAScript.

注意任何非本机对象都是宿主对象。

NOTE Any object that is not native is a host object.

来源： http://es5.github.com/#x4.3.8

一些例子：

原生对象：对象（构造函数），日期，数学， parseInt ， eval ，字符串方法如 indexOf 和 replace ，数组方法，...

Native objects: Object (constructor), Date, Math, parseInt, eval, string methods like indexOf and replace, array methods, ...

主机对象（假设浏览器环境）：窗口，文档， location ， history ， XMLHttpRequest ， setTimeout ， getElementsByTagName ， querySelectorAll ，...

Host objects (assuming browser environment): window, document, location, history, XMLHttpRequest, setTimeout, getElementsByTagName, querySelectorAll, ...

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