是由于 package参数的原因，值应该为'prepay_id=sign'
wx.requestPayment({
timeStamp: data.data.data['timestamp'],
nonceStr: data.data.data['order']['nonce_str'],
package: 'prepay_id='+data.data.data['order']['prepay_id'], // package参数 需要注意
signType: 'MD5',
paySign: data.data.data['order']['sign'],
total_fee: thatobj.data.tmpdata_selected_id_signup_charge_total,
success(res) {
}
})
