var name='测试文字';

     var t_name=encodeURIComponent(name);

         t_name=window.btoa(t_name);

         console.log(t_name,'base64==>')

     var p_name=window.atob(t_name);

         p_name=decodeURIComponent(p_name)

     console.log(p_name,'还原===》')