javascript - `Function` 创建的这些函数有什么区别？

Question

1.var f = new Function("a", "b", "return a+b")

2.var f2 = Function("a", "b", "return a+b")

f 和 f2 都是匿名函数。 f(1,2) 和 f2(1,2) 都返回 3。那么两者之间有什么实际的内部差异吗？Function 是否在内部返回一个函数对象？与使用 Function 作为构造函数new Function(...) 的区别？

Answer 1

来自ECMAScript 5.1 specs :

When Function is called as a function rather than as a constructor, it creates and initialises a new Function object. Thus the function call Function(…) is equivalent to the object creation expression new Function(…) with the same arguments.