js的事件循环与消息队列

JavaScript中的事件循环与消息队列
宏任务和微任务有什么区别

new Promise(function (resolve) {
    console.log('1');
    new Promise(function (resolve) {
        console.log('3');       
        new Promise(function (resolve) {
            console.log('5');       
            resolve();
        }).then(function () {
            console.log('6');
        });
        resolve();
    }).then(function () {
        console.log('4');
    });
    resolve();
}).then(function () {
    console.log('2');
});

参考上面两个文章,上面代码输出为:1 3 5 6 4 2