📜  js 如果定义了变量 - Javascript 代码示例

📅  最后修改于: 2022-03-11 15:03:14.688000             🧑  作者: Mango

代码示例2
try:
    thevariable
except NameError:
    print("well, it WASN'T defined after all!")
else:
    print("sure, it was defined.")