/**
* 将小程序的API封装成支持Promise的API
* @params fn {Function} 小程序原始API，如wx.login
*/
const wxPromisify = fn => {
return function (obj = {}) {
return new Promise((resolve, reject) => {
obj.success = function (res) {
resolve(res);
};
obj.fail = function (res) {
reject(res);
};
fn(obj);
});
};
};