javascript_json

//javascript_json
//json specifies that strings and key values ​​must be enclosed in double quotes

//-------------------------------------- Code 1:
'use strict'
function convert(key, value) {
    if (typeof value === 'string') {
        return value.toUpperCase();
    }
    return value;
}
var xiaoming = {
    name:'Akari',
    age: 19,
    married: false,
    height: '177cm',
    weight: '78kg',
    college: 'tsinghua',
    skills: ['java', 'javascript', 'spring', 'springmvc', 'mybatis']
}
var json1 = JSON.stringify(xiaoming, null, ' ');
var json2 = JSON.stringify(xiaoming, ['name', 'skills'], ' ');
var json3 = JSON.stringify(xiaoming, convert, ' ');
console.log(json1);
console.log(json2);
console.log(json3);
//--------------------------------------Code 1 explanation:
//1.JSON.stringify() method and serialization of objects

//--------------------------------------Code 2:
'use strict'
var xiaoming = {
    name:'Akari',
    age: 19,
    married: false,
    height: '177cm',
    weight: '78kg',
    college: 'tsinghua',
    skills: ['java', 'javascript', 'spring', 'springmvc', 'mybatis'],
    toJSON: function() {
        return {
            'name': this.name,
            'age': this.age
        };
    }
}
var json1 = JSON.stringify(xiaoming, null, ' ');
console.log(json1);
//-------------------------------------- Code 2 explanation:
//1. Define the 'toJSON' method in the object to control serialization

//--------------------------------------Code 2:
'use strict'
var json1 = '{"name": "小明", "age": 19, "married": false, "height": "177cm"}';
var obj1 = JSON.parse(json1, function(key, value) {
    if (value ==='Akari') {
        return value + 'classmate';
    }
    return value;
})
var json2 = JSON.stringify(obj1, null, ' ');
console.log(json2);
//-------------------------------------- Code 2 explanation:
//1.JSON.parse() method and deserialization of json

//--------------------------------------Code 3:
'use strict'
var url = 'https://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20weather.forecast%20where%20woeid%20%3D%202151330&format=json';
// Get JSON from remote address:
$.getJSON(url, function (data) {
    // get the result:
    var city = data.query.results.channel.location.city;
    var forecast = data.query.results.channel.item.forecast;
    var result = {
        city: city,
        forecast: forecast
    };
    console.log(JSON.stringify(result, null, ' '));
});
//--------------------------------------Code 3 explanation:
//1. Need to add jquery.js
//2. Visit Yahoo's weather API to view the returned JSON data