Bosses fourth questions how to explain the

CodePudding user response:

Only with a letter or an underscore to do first

CodePudding user response:

Cannot begin with Numbers, this is grammar rules

CodePudding user response:

I hope it can help you: https://blog.csdn.net/it_xiangqiang/category_10581430.html
I hope it can help you: https://blog.csdn.net/it_xiangqiang/category_10768339.html