Ajax+PHP image cropping preview simple example

Ajax+PHPImageCut image cropping, the implementation of image cropping to generate thumbnail part and preview function. This is a simple example of PHPAjax cropping images and generating new images on the server side. This time it is not jQuery, but using another The famous JS plug-in: prototype, also has very good performance. This image cropping has been tested under IE11, FireFox5, and Chrome55 (there is a little problem under Opear, the initial position of the cutting box is wrong, this problem has not been solved so far, sorry).