首页 > 代码库 > ECMA5.1中Object.seal()和Object.freeze()的区别

ECMA5.1中Object.seal()和Object.freeze()的区别

1  Object.seal(O)的调用

When the seal function is called, the following steps are taken:
   If Type(O) is not Object throw a TypeError exception.
   For each named own property name P of O,
      Let desc be the result of calling the [[GetOwnProperty]] internal method of O with P.
      If desc.[[Configurable]] is true, set desc.[[Configurable]] to false.
      Call the [[DefineOwnProperty]] internal method of O with P, desc, and true as arguments.
   Set the [[Extensible]] internal property of O to false.
  Return O.

 

2 Object.freeze(O)的调用

  If Type(O) is not Object throw a TypeError exception.
  For each named own property name P of O,
    Let desc be the result of calling the [[GetOwnProperty]] internal method of O with P.
    If IsDataDescriptor(desc) is true, then
      If desc.[[Writable]] is true, set desc.[[Writable]] to false.
      If desc.[[Configurable]] is true, set desc.[[Configurable]] to false.
    Call the [[DefineOwnProperty]] internal method of O with P, desc, and true as arguments.
    Set the [[Extensible]] internal property of O to false.
   Return O.

这两个函数的区别在于伪代码标记部分,这下是终于搞定这两个函数的区别了。