Function getValFromLocalStorage

app/utils/index.ts:203–215

(key: string, defVal?: T)

 * @returns
 */
export function getValFromLocalStorage<T>(key: string, defVal?: T): T | null {
  const val = localStorage.getItem(key)
  if (val) {
    try {
      return JSON.parse(val)
    } catch (e) {}
  }
  if (defVal !== undefined) {
    localStorage.setItem(key, JSON.stringify(defVal))
    return defVal
  }
  return null
}

// 计算文件或Blob的MD5哈希值
export async function calcMD5(file: File | Blob) {