author suo
  class PCMouseHelper { public constructor ( ) { } /**
     * 切换指针形状
     */ public static changeCursor ( ) { let canvas = document . getElementsByTagName ( "canvas" ) [ 0 ] ; let style = canvas . style ; style . cursor = 'url(cursor/cursor.png) 37.5 38,auto' ; } /**
     * 恢复正常
     */ public static recover ( ) { let canvas = document . getElementsByTagName ( "canvas" ) [ 0 ] ; let style = canvas . style ; style . cursor = 'auto' ; } }