此Javascript一线函数如何工作？

Question

var hasAll = Object.keys(obj1).every(Object.prototype.hasOwnProperty.bind(obj2));

Answer 1

It borrows Object#hasOwnProperty from the prototype of Object and uses bj2 as this object with binding ( Function#bind ). 它借用Object#hasOwnProperty从原型Object ，并使用bj2作为this目的用结合（ Function#bind ）。

The result is a function, which can be used as callback. 结果是一个函数，可以用作回调。