JS 随机字符串

randomString: function (e) {
      e = e || 32;
      var t = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789",
          a = t.length,
          n = "";
      for (let i = 0; i < e; i++) {
        n += t.charAt(Math.floor(Math.random() * a));
      }
      return n
    },