return m+n;

}

console.log(fun(5,6))

      return 'fun';

}

      return data;

}

console.log(fun('22'))

var fun = (data) => { return data; }

var fun = data => data;

console.log(fun('33'))

var fun = data => data==44?'yes':'no';

console.log(fun('44'))

var fun = data => {

      return data;

}

var fun = data => {

      return data==44?'yes':'no';

}

var m=setInterval(()=>{

      console.log(n);n++;

      if(n==10)clearInterval(m);

},1000);

var name = "最外层";

var obj = {

      name: "对象内",

      fun1: function(){

            console.log(this.name)

      },

      fun2: () => {

            console.log(this.name)

      },

      fun3: () => {

            console.log(name);

      }

}

fun4 = () => console.log(this.name);

fun5 = () => console.log(name);

obj.fun1(); //对象内

obj.fun2(); //最外层

obj.fun3(); //最外层

fun4(); //最外层

fun5(); //最外层