master

分支 (1)

管理

管理

master

js-event-loop
/
test.html

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div id="app">
        {{ message }}
    </div>
</body>

<script>
    for (let i = 0; i < 5; i++) {
        setTimeout(function () {
            console.log('异步任务', i);
        }, 200);
    }

    console.log('同步任务', i);//Uncaught ReferenceError: i is not defined
</script>

<!-- <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
<script>
    var app = new Vue({
        el: '#app',
        data: {
            message: 'Hello Vue!'
        }
    })

    setTimeout(function () {
        console.log('定时器setTimeout')//5
    }, 0);

    new Promise(function (resolve) {
        console.log('同步任务1');//1
        for (var i = 0; i < 10000; i++) {
            i == 99 && resolve();
        }
    }).then(function () {
        console.log('Promise.then')//3
    });

    app.$nextTick(() => {
        console.log('nextTick')//4
    })

    console.log('同步任务2');//2
</script> -->

<!-- <script>
    setTimeout(() => {
        console.log('1')
        Promise.resolve().then(() => {
            console.log('2')
        })
    }, 0)

    new Promise((resolve, reject) => {
        console.log('3')
        resolve()
    })
        .then(res => {
            console.log('4');
        })

    console.log('5')
</script> -->

<!--
<script>
    console.log('1')

    setTimeout(function callback() {
        console.log('2')
    }, 1000)

    new Promise((resolve, reject) => {
        console.log('3')
        resolve()
    })
        .then(res => {
            console.log('4');
        })

    console.log('5')
</script> -->

<!-- <script>
    console.log('1')

    setTimeout(function () {
        console.log('2')
    }, 1000)

    console.log('3')
</script> -->

</html>