Typescript error :Property mozRequestFullScreen' does not exist on type 'HTMLElement'
当我一开始在做全屏功能的时候，遇到了以下这个问题：
Typescript error :Property mozRequestFullScreen' does not exist on type 'HTMLElement'.
其他类似问题：property ‘xxx’ does not exist on type ‘yyy’
解决：声明用let de : any;