export function preventDefaultListener(e: any) {
 e.preventDefault()
}

;

export async function imageToCanvas(url: string, canvas: HTMLCanvasElement) {
 return new Promise((resolve, reject) => {
 //新建Image对象，引入当前目录下的图片
 const img = new Image()
 img.src = url
 const c = canvas.getContext('2d')!

 //图片初始化完成后调用
 img.onload = function () {
  //将canvas的宽高设置为图像的宽高
  canvas.width = img.width
  canvas.height = img.height

  //canvas画图片
  c.drawImage(img, 0, 0, img.width, img.height)
  resolve()
 }
 img.addEventListener('error', (e) => {
  reject(e)
 })
 })
}

const throwFn = () => {
 throw new Error(
 "Uncaught DOMException: Failed to execute 'toDataURL' on 'HTMLCanvasElement': Tainted canvases may not be exported.",
 )
}

const $canvasRef = useRef(null)
 useEffect(() => {
  ;(async () => {
   await imageToCanvas(props.url, $canvasRef.current!)
   $canvasRef.current!.toBlob = throwFn
   $canvasRef.current!.toDataURL = throwFn
  })()
 }, [])
 return (
  
 )

/**
 * 兼容异步函数的返回值
 * @param res 返回值
 * @param callback 同步/异步结果的回调函数
 * @typeparam T 处理参数的类型，如果是 Promise 类型，则取出其泛型类型
 * @typeparam Param 处理参数具体的类型，如果是 Promise 类型，则指定为原类型
 * @typeparam R 返回值具体的类型，如果是 Promise 类型，则指定为 Promise 类型，否则为原类型
 * @returns 处理后的结果，如果是同步的，则返回结果是同步的，否则为异步的
 */
export function compatibleAsync, R = T>(
 res: Param,
 callback: (r: T) => R,
): Param extends Promise ? Promise : R {
 return (res instanceof Promise
 ? res.then(callback)
 : callback(res as any)) as any
}

/**
 * 测试函数的执行时间
 * 注：如果函数返回 Promise，则该函数也会返回 Promise，否则直接返回执行时间
 * @param fn 需要测试的函数
 * @returns 执行的毫秒数
 */
export function timing(
 fn: (...args: any[]) => R,
 // 函数返回类型是 Promise 的话，则返回 Promise，否则返回 number
): R extends Promise ? Promise : number {
 const begin = performance.now()
 const res = fn()
 return compatibleAsync(res, () => performance.now() - begin)
}
/**
 * 禁止他人调试网站相关方法的集合对象
 */
export class AntiDebug {
 /**
 * 不停循环 debugger 防止有人调试代码
 * @returns 取消函数
 */
 public static cyclingDebugger(): Function {
 const res = setInterval(() => {
  debugger
 }, 100)
 return () => clearInterval(res)
 }
 /**
 * 检查是否正在 debugger 并调用回调函数
 * @param fn 回调函数，默认为重载页面
 * @returns 取消函数
 */
 public static checkDebug(
 fn: Function = () => window.location.reload(),
 ): Function {
 const res = setInterval(() => {
  const diff = timing(() => {
  debugger
  })
  if (diff > 500) {
  console.log(diff)
  fn()
  }
 }, 1000)
 return () => clearInterval(res)
 }
}

useEffect(() => {
 const cancel1 = AntiDebug.cyclingDebugger() as any
 const cancel2 = AntiDebug.checkDebug(() =>
 console.log('请不要打开调试'),
 ) as any
 return () => {
 cancel1()
 cancel2()
 }
}, [])

return