event loop stuff

event-loop-test.js

console.log('1, time = ' + new Date().toString())
setTimeout(macroCallback, 0);
new Promise(function (resolve, reject) {
    console.log('2, time = ' + new Date().toString())
    resolve();
    console.log('3, time = ' + new Date().toString())
    new Promise((rs1) => {
        console.log('rs1')
        rs1();
    }).then(() => {
        console.log('rs1 cb')
        new Promise((rs2) => {
            console.log('rs2')
            rs2();
            new Promise((rs3) => {
                console.log('rs3')
                rs3();
            }).then(() => {
                console.log('rs3 cb')
            })
        }).then(() => {
            console.log('rs2 cb')
        })
    })
}).then(microCallback);

function macroCallback() {
    console.log('4, time = ' + new Date().toString())
}

function microCallback() {
    console.log('5, time = ' + new Date().toString())
}