SOURCE

var length = 10;
 			function fun() {
				console.log(this);
				console.log(this.length)
			}
		var obj = {
			length: 5,
			get(fun) {
				fun();
				arguments[0]()
			}
		}
		obj.get(fun,2)  


console.log('------------------------------------------')

  var z = 10;
  function fun1 () {
    console.log(this);
    console.log(this.z)
  }
  var obj1 = {
    z: 5,
    get: fun1 
  }  
  obj1.get()
  
  console.log('------------------------------------------')
  	
  var aaa = 1;
  var aa = function () {
    console.log(this.aaa)
  }
  
  var obj2 = {
    aaa: 2,
    get: aa
  }
  
  var {get} = obj2;

  obj2.get()
  get()