微信小程序提交数据到后台服务汉字乱码

 wx.request({
        url: app.globalData.yzmUrl + "?method=sendsmsCode",
        method: 'POST',
        header: { 'content-type': 'application/x-www-form-urlencoded;charset=utf-8' },
        data: { phone: param.phone},
        success: function (data) {
          console.log(data);
        }
      });

wx.request({})使用POST请求，添加header属性{ 'content-type': 'application/x-www-form-urlencoded;charset=utf-8' }