//原型式繼承function inheritObject(o) {  //聲明一個(gè)過渡函數(shù)對(duì)象  function F() {    //過渡對(duì)象的原型繼承父對(duì)象      F.prototype = o;  }  //返回過渡對(duì)象的一個(gè)實(shí)例，該實(shí)例的原型繼承了夫?qū)ο?nbsp; return new F();}//測(cè)試let book = {  name: 'js books',  alikeBook: ['css book', 'html book']};let newBook = inheritObject(book);newBook.name = 'ajax book';// newBook.alikeBook.push('xml book');console.log(newBook.name);           //ajax bookconsole.log(newBook.alikeBook);      //undefinedconsole.log(book.name);              //js booksconsole.log(book.alikeBook);         //['css book', 'html book']想問一下，問什么newBook.alikeBook是undefined？