1.下载插件

npm install --save js-base64

2.插件引入

const Base64 = require('js-base64').Base64

3.cookie设置函数

setUserInfo() {
      // 判断用户是否勾选记住密码，如果勾选，向cookie中储存登录信息，
      // 如果没有勾选，储存的信息为空
      if (this.checked) {
        this.setCookie("account", this.loginForm.username);
        // base64加密密码
        let passWord = Base64.encode(this.loginForm.password);
        this.setCookie("password", passWord);
      } else {
        this.setCookie("account", "");
        this.setCookie("password", "");
      }
    },
    // 获取cookie
    getCookie(key) {
      if (document.cookie.length > 0) {
        var start = document.cookie.indexOf(key + "=");
        if (start !== -1) {
          start = start + key.length + 1;
          var end = document.cookie.indexOf(";", start);
          if (end === -1) end = document.cookie.length;
          return unescape(document.cookie.substring(start, end));
        }
      }
      return "";
    },
    // 保存cookie
    setCookie(cName, value, expiredays) {
      var exdate = new Date();
      exdate.setDate(exdate.getDate() + expiredays);
      document.cookie =
        cName +
        "=" +
        decodeURIComponent(value) +
        (expiredays == null ? "" : ";expires=" + exdate.toGMTString());
    }

参考链接：https://www.cnblogs.com/qisi007/p/10200140.html