单选题

以下JavaScript 代码,返回 false 的是

Question

以下JavaScript 代码,返回 false 的是

A. var test=1typeof test=='number'

B. var test=1.2typeof test=='float'

C. var test=undefinedtypeof test=='undefined'

D. var test={}typeof test=='object'

E. var test='4399'-0typeof test=='number'

F. var test=nulltypeof test=='object'