shaonbean的博客 d.get(‘key’) is not None C. hasattr(d, ‘key’) D. ‘key’ in d 正确答案:A,D 10. 假设 d 为一个空字典 d = {}。以下语句中执行后,d 的内容将会变为 {‘key’: 1 }: A. d[‘key’] = 1 B. d.update(‘key’=...
JackieDYH的博客 vue实例只能挂在到普通的元素标签上,不能是html、body标签,而且推荐使用id选择器来获取标签 [Vue warn]: Property or method "XXX" is not defined on the instance but referenced during render. vue框架是一个...