The origin of cursive script

The cursive script comes from the official script, and the scribbled official script is called Cao Zhang, such as the first aid chapter of Lu Ji; Today's cursive script was created by Wei and Jin calligraphers (such as the two kings) on the basis of regular script and chapter return, and it is also a scribbled running script. Later, it developed further. In the Tang Dynasty, there were wild grasses of Zhang Xu and Huai Su, so they were called "Zhang Dianhuai Crazy", but they are no longer practical, and only have appreciation value. There are not many cursive scripts after the Tang Dynasty.