text: export default function onExitFullscreen() {
  
    let c
    let w, h
    let d, s
  
    c = this.setting.canvas.element
    d = c.width > c.height ? 'width' : 'height'
  
    s = screen[d] / c[d]
    w = this.setting.width
    h = this.setting.height
  
    c.dataset.LveFullscreenOriginWidth = w
    c.dataset.LveFullscreenOriginHeight = h
  
    c.width = w * s
    c.height = h * s
  
    this.setting.canvasScale = s
  
  }