麻烦请教一下老师，promise嵌套的执行顺序以及原因是什么？

new Promise(function (resolve, reject) {
    console.log('promise');
    resolve();
    new Promise(function (resolve, reject) {
        console.log('promise>>>');
        resolve();
    }).then(function () {
        console.log('resolved>>> 0')
    }).then(function () {
        console.log('resolved>>> 1')
    }).then(function () {
        console.log('resolved>>> 2')
    }).then(function () {
        console.log('resolved>>> 3')
    })
}).then(function () {
    console.log('resolved 0')
}).then(function () {
    console.log('resolved 1')
}).then(function () {
    console.log('resolved 2')
}).then(function () {
    console.log('resolved> 3')
})