text: // 生成随机字符串
  export default function(len = 32) {
    const $chars =
      "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";
    const maxPos = $chars.length;
    let str = "";
    for (let i = 0; i < len; i++) {
      str += $chars.charAt(Math.floor(Math.random() * maxPos));
    }
    return str;
  }
  