上下文规则2 – 开源达人博客

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

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        //圆括号直接调用函数，则函数的上下文是window对象   函数()

        var obj = {
            a: 1,
            b: 2,
            c: function() {
                console.log(this.a + this.b);
            }
        }
        var a = 11;
        var b = 22;

        var fu = obj.c;
        fu();
    </script>
</body>

</html>

JS

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