node.js - 为什么要将 Local::New 与 String::New() 一起使用

Question

我用过这个:

 Local<Value> argv[argc] = { String::New("hello world") };

但现在我在 node.js 网站上看到了这个例子:

 Local<Value> argv[argc] = { Local<Value>::New(String::New("hello world")) };

这是什么意思？有什么区别，当一个 dwhy 我应该使用 Local<Value>除了String::New()

Answer 1

显然，本例中的 node.js 示例是错误的/低效的。

https://github.com/joyent/node/commit/98aad77f466d9c36947f2cbb6d07b75009795ed2#commitcomment-5532648

jnardone added a note 2 hours ago

Was this just one of those things that was always wrong, or was there an underlying v8 change that meant that this should change? The additional Local::New always looked odd but I can't tell if something buried inside v8 required this additional wrapper or not.

bnoordhuis added a note 7 minutes ago

It's cleanup. Creating a Local out of a Local is not actively harmful but it's superfluous and slightly inefficient.

所以，您的第一种格式没问题。