var obj = { lenght: 20, myLength: function (fn) { console.log(this.length) fn(); arguments[0](); } } var myFn = function () { console.log(this.length) }; var length = 200; obj.myLength(myFn)
js之 call、apply和bind
原文：https://www.cnblogs.com/benbendu/p/9418653.html
