function test() {
var x = 1;
var bar = function() {
console.log(this.x);
}
var obj1 = {x: 1};
var obj2 = {x: 2};
var obj3 = {x: 3};
var fun = bar.bind(obj1);
fun();
var fun = bar.bind(obj1).bind(obj2);
fun();
var fun = bar.bind(obj1).bind(obj2).bind(obj3);
fun()
}
根据作用链原理,该函数运行结束后,得到的控制台输出为:111