Preface
最开始是想知道网页图片的质量百分比如何界定。而压缩比是影响图片质量（同一张图片、相同像素）的关键。一般来讲，压缩比低，图片文件体积大；压缩比高，体积小。
How to check the size of images on a web page?
1. Google browser
(1) F12->Move to the corresponding image link->You can view the corresponding volume information.
2. Firefox browser
, but you cannot see the image size for directly opened image links. At this time we Change the browser,
enter the image link->right-click->view image information.
Then you can view the corresponding image size.
