微信支付

1.传给后台openid，订单号，金额，商品数量
2.后台返回参数：timeStamp nonceStr package signType paySign
3.调用wx.requestPayment

wx.requestPayment({
  "timeStamp":timeStamp, 
  "nonceStr":nonceStr,
  "package": package,
  "signType": signType,
  "paySign":paySign,
  "success":function(res){
    if (res.errMsg == 'requestPayment:ok') {
        wx.showToast({
         title: '支付成功',
         icon: 'none',
         duration: 2000
         })
       };
     },
    "fail":function(res){},
    "complete":function(res){}
 })
参考资料： https://www.jianshu.com/p/20d2d4ec04d0
https://www.jianshu.com/p/5c9573c3d8f6