ES6/test.html at master · AlexShan2008/ES6 · GitHub

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<!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>
</head>

<body>
    <script>
        function Timer() {
            this.s1 = 0;
            this.s2 = 0;
            // arrow function
            setInterval(() => {
                this.s1++;
            }, 1000)
            // normal function
            setInterval(function () {
                this.s2++;
            }, 1000)
        }

        var timer = new Timer();
        setTimeout(() => {
            console.log("s1:",timer.s1);
        }, 3100);
        setTimeout(() => {
            console.log("s2:",timer.s2);
        }, 3100);


    </script>
</body>

</html>