问题描述：

1、当前小程序未发布，正处于开发阶段

2、发起支付的appid和服务端的appid都是一个值（小程序的appid）

3、服务端请求下单接口一切正常，返回数据也一切正常，没有报错或验签失败的现象，参数如下：

{

"timeStamp": 1642407577,

"nonceStr": "1JYD4286KH45LOY7MEM2H8X6EZAXPA65",

"package": "prepay_id=wx171619373602695cffdf9bef6ad6950000",

"signType": "RSA",

"paySign": "EnEfdLFOrN72Iedxvzt0HiZn3i6KiXzjj\/DPjIrgX4WDMpYpfQTPOhHziOAejavvdHoSXi36\/48e5I6gx0mySwNYzioiQE\/C\/LqUbPUYxrFVk6DpkoBcz7+wdzU24qhrQSZGaclfpJDe6NiEuPvsT7ceIrisRerrc0TICKzl9uR2fWvHxO9KFDCoYJql25A9AiA\/\/Ri5a5jfMKIwUjYX1rta2J5DchXiSOAwOkQSKHUXoiSwNiOv9FkT+VpgqJGtr+6sIatM07yStzb2ELfRgcswgBqVN9DGBHYlQjDKxBxDoz9r2LNKfFAmv4xcTL8ZPv4tQsv4zLf0YlhjKQc+5g=="

}

4、在手机上测试支付报错如下：

调用支付JSAPI缺少参数：total_fee

5、小程序的代码：

wx.requestOrderPayment({
  timeStamp: `"${res2.data.timeStamp}"`,
  nonceStr: `"${res2.data.nonceStr}"`,
  package: `"${res2.data.package}"`,
  signType: `"${res2.data.signType}"`,
  paySign: `"${res2.data.paySign}"`,
  success (res) {
    console.log('成功');
    console.log(res);
  },
  fail (res) {
    console.log('失败');
    console.log(res);
  }
})