JS Function.prototype.bind usage

JS-Function-Bind

## What does Function.prototype.bind do ?

Function.prototype.bind = function (scope) {
    if (typeof this !== "function") {
      throw new TypeError("Function.prototype.bind - what is trying to be bound is not callable");
    }
    
    var fn = this;
    return function () {
        return fn.apply(scope);
    };
}

JavaScript 中的函数原型链中有一个 bind 方法，可以用来静态绑定函数的上下文。