The work made of late. Topic is the subject of class stay.
Title: Use the radio button dialog box, change the background color to achieve the effect.
Please complete before 8 pm Wednesday. Requirements submit code and screenshots in the blog.
You are not limited to the Baidu network disk speed downloader:
Link: https: //pan.baidu.com/s/1T0IbQVEHeRsF13POwuHMuA
extraction code: grdk