This website requires JavaScript.
Explore
Help
Register
Sign In
greatbody
/
freeCodeCamp
mirror of
https://github.com/freeCodeCamp/freeCodeCamp.git
Watch
1
Star
0
Fork
You've already forked freeCodeCamp
0
Code
Issues
Projects
Releases
Wiki
Activity
5ee74650f1
freeCodeCamp
/
guide
/
chinese
/
javascript
/
undefined-primitive-values
/
index.md
262 B
Raw
Blame
History
title
localeTitle
Undefined Primitive Value
未定义的原始值
自动分配给刚刚声明的变量的原始值或没有实际参数的正式参数。
MDN