stringify的问题

先传入 空 - 初始value0，然后返回一个值value1（如果不对case""操作的话返回的就是初始value0），将stringify返回的value1作为新的value传入，返回的value2作为下一次循环的新value

var book = {"authors" : ["Nicholas C. Zakas","json"],"title" : "Professional javascript",edition : 3,year : 2011,toJSON : function(){return this;}};var jsonText = JSON.stringify(book,function(key,value){console.log(key);switch(key){case "authors":console.log(JSON.stringify(value));return value.join("**");case "year":console.log(JSON.stringify(value));return 5000;case "edition":console.log(JSON.stringify(value));return undefined;case "":console.log(JSON.stringify(value));return {"title":"Professional javascript","edition":3,"year":2011};default:console.log(JSON.stringify(value));return value; }}," - -");console.log("answer  " + jsonText);

---------------------输出---------------------
 
 {"authors":["Nicholas C. Zakas","json"],"title":"Professional javascript","edition":3,"year":2011}
 title
 "Professional javascript"
 edition
 3
 year
 2011
 answer  {
 - -"title": "Professional javascript",
 - -"year": 5000
}