js看代码, 写运行结果

1.箭头函数

<!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>
    <script>
        var str = 'window';
        const obj={
            str:'obj',
            fn:()=>{
                console.log(this.str);
            },
            fn2:function(){
                console.log(this.str,'当前')
                return {
                    str:'newObj',
                    fn:()=>{
                        console.log(this.str)
                    }
                }
            }
        }


        obj.newFn = ()=>{
            console.log(this.str)
        }
        obj.fn()
        obj.newFn()
        var newObj = obj.fn2()
        newObj.fn()



var str = 'window';
const obj={
    str:'obj',
    fn:function(){
        console.log(this.str);
    },
    fn2:function(){
        console.log(this.str,'当前')
        return {
            str:'newObj',
            fn:function(){
                console.log(this.str)
            }
        }
    }
}


obj.newFn = function(){
    console.log(this.str)
}
obj.fn()
obj.newFn()
var newObj = obj.fn2()
newObj.fn()

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