vue 项目报错：Error in nextTick: "InvalidCharacterError: Failed to execute 'setAttribute' on 'Element': ',' is not a valid attribute name."

如上图，控制台出现类似： Error in nextTick: "InvalidCharacterError: Failed to execute 'setAttribute' on 'Element': ', ' is not a valid attribute name." 错误，说明vue template 里多写了别的字符，如：","号。