JSAPI唤起支付，输入完密码之后，一直在等待，然后就提示系统繁忙了。
WeixinJSBridge.invoke(
'getBrandWCPayRequest',
{
appId: "wx8151bdf28af69557",
timeStamp: "1602748609",
nonceStr: "DgT09scE4oGrr3o4WsYhbtDwYM1CsB4g",
package: "prepay_id=wx151556494446130f6ea004919b0b320000",
signType: "RSA",
paySign: "JfehsSdaelWfFJfrnZONMngq7ktPG0dG0dGAW3Cj0N5Nz4RWd9v3G/W7AZQu2k3ByRpY4ZKg+T7FgEbzUwkMw103K7fY84youuFQJz/sSBH32cBUdXgaTB6VOFUoWXPPjeNsyMpzLJwSqMJp0rgbcLY++UzQE0nRsP8/X25GVBPWsCrLvklhyl8rMt7dIjBO9rrO/9zz1QF7PLijcbH7pCVGc3QGUA8ZN7dkTizgLZRoPxEYYCqd04HT5UegOeg3uoeC9FQg44l5ApmC8X1vOUt/i+7wtTAHCNU/zjBXixLWkfdNLz2NuQn+GtwVkubRhfOedxF4bWAnOeRiuVnwDw=="
},
function(res) {
console.log('onBridgeReady -> res', res)
if (res.err_msg === 'get_brand_wcpay_request:ok') {
alert('支付成功！')
}
}
)
