题解 | #_call函数#
_call函数
https://www.nowcoder.com/practice/22df1ed71b204a46b00587fdb780b3ab
Function.prototype._call = function(thisArg,...args) {
// 1.获取目标函数
var fn = this
// 2.将thisArg转换为对象类型，避免传入的是非对象类型
thisArg = (thisArg !== null && thisArg !== undefined) ? Object(thisArg):window
// 3.执行函数
thisArg.fn = fn
var res = thisArg.fn(...args)
delete thisArg.fn
// 4.返回结果
return res
}
