let sky_blue001 = $('#sky_blue001').html();
let sky_blue002 = $('#sky_blue002').text();
let sky_blue003 = $('#sky_blue003').val();
$('#sky_blue004').addClass("is-sucess");
$('#sky_blue005').removeClass("is-sucess");
$('#sky_blue006').css('display', 'block');
$('#sky_blue006').css('display', 'none');
let sky_blue007 = [1,3,5,7,9];
let sky_blue008 = sky_blue007.push(11,13);
let sky_blue009 = sky_blue007.splice(3,1);
let sky_blue010 = sky_blue007.concat(15,17);
var person = new Person();
person.name = 'yy';
person.age= 18;
delete person.name;
console.log(person.name);