js 变量作用域

 

js4种调用模式中的 前两种

 

 

var name = 222;
var a = {
    name: '111',
    say: function () {
        console.log(this.name);
    }
}

var fun = a.say;
fun();
a.say();

var b = {
    name: '333',
    say: function (fun) {
        fun();
    }
}

b.say(a.say);
b.say = a.say;
b.say();