https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function
据说
Properties and Methods of Function
The global Function object has no methods or properties of its own, however, since it is a function itself it does inherit some methods and properties through the prototype chain from Function.prototype.
然后它继续说
Function prototype object
Properties
Function.arguments
An array corresponding to the arguments passed to a function. This is deprecated as property of Function, use the arguments object available within the function instead.
Function.arity
Used to specifiy the number of arguments expected by the function, but has been removed. Use the length property instead.
Function.caller
Specifies the function that invoked the currently executing function.
Function.length (!!!here is what I confused, why it does not display Function.prototype.length)
Specifies the number of arguments expected by the function.
Function.name
The name of the function.
Function.displayName
The display name of the function.
Function.prototype.constructor
Specifies the function that creates an object's prototype. See Object.prototype.constructor for more details.
Methods
只是想知道 Function.length 是否是 Function.prototype 的属性?
欢迎您发表评论
最佳答案
来自MDN docs on Function.length
:
The
Function
constructor is itself aFunction
object. Itslength
data property has a value of 1.
Function.length
等于 1
,因为 Function
构造函数采用一个形式参数 - 函数体。
The
length
property of theFunction
prototype object has a value of 0.
Function.prototype.length
等于 0
,因为 Function.prototype
不接受任何参数。
关于javascript - 'Function' 上的 MDN 描述感到困惑,Function.length 是 Function 或 Function.prototype 的属性,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/39524513/