uni-app payment 返回码62000是什么原因，log如下

[LOG] : wxpay
[LOG] : [{“id”:“alipay”,“description”:“支付宝”,“serviceReady”:true},{“id”:“wxpay”,“description”:“微信”,“serviceReady”:true}]
[LOG] : {“id”:“wxpay”,“description”:“微信”,“serviceReady”:true}
[LOG] : pay
[LOG] : pay money:100
[LOG] : 请求支付订单：http://demo.dcloud.net.cn/payment/?payid=wxpay&appid=HBuilder&total=100
[LOG] : 请求订单成功: {“appid”:“wx0411fa6a39d61297”,“noncestr”:“PeDFYL3KFbU2RngW”,“package”:“Sign=WXPay”,“partnerid”:“1230636401”,“prepayid”:“wx20151111095957c0cf5405a80000462650”,“timestamp”:1447207044,“sign”:“85BDFF607326C015CBA4A75982BD2DEC”}
[LOG] : 支付失败: [62000]：undefined

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