复制
1var name = 'window'
2const obj = {
3    name: 'obj',
4    sayName:function() {
5        console.log(this.name)
6    },
7}
8obj.sayMyName = () => {
9    console.log(this.name)
10}
11const fn1 = obj.sayName
12const fn2 = obj.sayMyName
13fn1() 
14obj.sayName() 
15fn2() 
16obj.sayMyName()