一个用Javascr ipt控制的vrml场景，可以通过拖动进度条调节天空和地面的颜色，效果十分的好，利于初学者学习研究。-The control of a vrml scene with Javascr ipt, you can drag the progress bar adjust the color of the sky and ground, the effect is very good, which will help beginners to study and research