Node.js JSON模块用法实例分析

JSON.stringify(value [, replacer] [, space])

var person = new Object();
person.name = 'chy';
person.age = 24;
person.city= ['FuZhou', 'XiaMen'];
var replacerArr = [ 'name', 'city', 'unknown' ];
var space = '-*-';
JSON.stringify(person);
//输出 '{"name":"city","age":24,"city":["FuZhou","XiaMen"]}'
JSON.stringify(person, replacerArr);
//输出 '{"name":"chy","city":["FuZhou","XiaMen"]}'
JSON.stringify(person, function(key, value) {
  console.log("key = " + key);
  return value.toString().toUpperCase();
});
/*
输出
key =
'"[OBJECT OBJECT]"'
*/

var personArr = [ 'Bob', 'Tina', 'Tom', 'bob', 'Linda' ];
var replacerArr = [ 'name', 'city', 'unknown' ];
var space = '-*-';
JSON.stringify(personArr);
//输出 '["Bob","Tina","Tom","bob","Linda"]'
JSON.stringify(personArr, replacerArr);
//输出 '["Bob","Tina","Tom","bob","Linda"]'
JSON.stringify(personArr, function(key, value) {
  console.log("key = " + key);
  return value.toString().toUpperCase();
});
/*
输出
key =
'"BOB, TINA, TOM, BOB, LINDA"'
*/

JSON.parse(string)

JSON.parse('{name:"chy"}');
//输出 SyntaxError: Unexpected token n in JSON at position 1
JSON.parse("{'name':'chy'}");
//输出 SyntaxError: Unexpected token ' in JSON at position 1
JSON.parse('{"name":"bob"}');
//输出 { name: 'bob' }
JSON.parse("{\"name\":\"bob\"}");
//输出 { name: 'bob' }
JSON.parse('{"age":1}');
//输出 { age: 1 }