JavaScript authoritative Guide (sixth Edition) first reading notes-objects

1 varBook = {2"Main title": "JavaScript",//There are spaces in the attribute name and must be represented by a string3"Sub-Title": "The Definitive Guide",//there are hyphens in the attribute name and must be represented by a string4' For ': ' All audiences ',//"for" is a reserved word, so you must use quotation marks5Author: {//Note that the attribute names here are not quoted6FirstName: "David",7Surname: "Flanagan"8     }9 }; -  //Object Get Property the  //Console.log (book.author); -  - //Add Property - //book.date = "2017.7.27"; + //Console.log (book.date); -  + //Delete Property A Deletebook.date; at  - //Object Traversal -  for(varIteminchBook ) { -Console.log (typeof(Book[item])); -     Switch(typeof(Book[item])) { -          Case' Object ': in              - Console.log (Book[item]); to              Break; +         default: -Console.log (item + "= =" +Book[item]); the              Break; *  $     }Panax Notoginseng  - } the  + //Object Replication A  the //copies the member property of O to P and returns the P +  - functioncopy (o) { $   varp = O | | {};//if no object is passed to the parameter p, a newly created object is used $   returnp; - } -  the varBook1 =copy (book); - //Console.log (BOOK1);

JavaScript authoritative Guide (sixth Edition) first reading notes-objects