手动实现一个bind函数

[NuoHui]

 Function.prototype.bind = function (ctx) {
        const _otherParam = Array.prototype.slice.call(arguments, 1)
        const _this = this
        return function customBind () {
          const _params = Array.prototype.slice.call(arguments)
          _this.apply(ctx, [].concat(_otherParam, _params))
        }
      }