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