首页有以下JavaScript代码： var engineer = ( name: Chrig' age:30, work:function() console.1og('programing...'); ) 1) console.1og(engineer[name]); 2) console.1og(engineer[1]); 3) console.1og(engineer[ work'] 0); 4) console.1og(engineer.work); 以上哪种访问方式是可以正常访问到engineer的成员？() A:1) B： 2) C： 3) D： 4)

有以下JavaScript代码： var engineer = ( name: Chrig' age:30, work:function() console.1og('programing...'); ) 1) console.1og(engineer[name]); 2) console.1og(engineer[1]); 3) console.1og(engineer[ work'] 0); 4) console.1og(engineer.work); 以上哪种访问方式是可以正常访问到engineer的成员？() A:1) B： 2) C： 3) D： 4)

时间: 2024-03-31 15:36:09 浏览: 121

Cocoa programing handbook.pdf

This book aims to serve as a guide to the Cocoa APIs found on Mac OS X. The core frameworks are described in detail, as are many of the other components used to build rich applications. These APIs are huge. In most Cocoa programs, you include the Cocoa.h header, which imports the two core frameworks that make up Cocoa. This header, when preprocessed, including all of the headers that it references, is well over 100,000 lines long. If you printed the preprocessed header out, you would get something over twice as long as this book, and you would still only have the core APIs, and not any of the more advanced parts discussed in later parts of this book. This book aims to provide a guided tour, indicating features of interest to help visitors find their way around this enormous family of APIs. As with many travel books, this aims to include the same ‘must-see’ destinations that everyone will visit as well as some of the more interesting but often-overlooked parts. Deep familiarity with something like Cocoa only comes from years of practice using the classes that are included as part of the frameworks. This book provides an introduction, but you will only become an expert OS X developer if you take the information contained in these pages and apply it, developing your own applications.

正确的访问方式是 D：4) console.1og(engineer.work);。因为work是一个函数，应该通过对象名.属性名的方式来访问。而选项A和B都是通过对象名[属性名]的方式来访问，而属性名应该是一个字符串，所以会报错。选项C的语法也是不正确的，应该是engineer['work']()。

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