javascript – 功能和新功能之间的区别

我有时会看到人们在做这个功能(‘alert(“hi”)’),有时他们会做新功能(‘alert(“hi”)’)

这两者有区别吗？

解决方法

spec(第127页)说它们是完全相同的.

15.3.1.1 Function (p1,p2,…,pn,body)

When the Function function is called
with some arguments p1,
body (where n might be 0,that is,
there are no “p” arguments,and where
body might also not be provided),the
following steps are taken:

1. Create and return a new Function object as if the standard built-in
   constructor Function was used in a new
   expression with the same arguments
   (15.3.2.1).

但是,您应该不惜一切代价避免使用Function cinstructor.它需要评估你传递给它的字符串; eval是邪恶的,也是缓慢的.