Promise 配合async await 做的红绿灯闪烁

直接上代码：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        #light{
            /* background:red; */
            width:50px;
            height:50px;
            border-radius:50%;
            border:1px solid #000;
            }
    </style>
</head>
<body>
    <div id="light"></div>
    <script>
        function sleep(duration) {
            return new Promise(function(resolve, reject) {
                setTimeout(resolve,duration);
            })
        }
        // 接收延迟时间和颜色
        async function changeLightColor(duration, color){
            document.getElementById('light').style.background = color
            console.log('color', color)
            await sleep(duration)
        }
        async function act() {  // 一直循环
            while (true) {
                await changeLightColor(3000, 'red');
                await changeLightColor(2000, 'green');
                await changeLightColor(1000, 'yellow');
            }
        }
        act()

    </script>
</body>
</html>

Eveweiscsdn

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Promise 配合async await 做的红绿灯闪烁

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