通过 js 调起微信官方的微信支付api

function onBridgeReady() {
	WeixinJSBridge.invoke(
		'getBrandWCPayRequest', { 
			"appId": "wx2421b1c4370ec43b", // 公众号ID，由商户传入     
			"timeStamp": "1395712654", // 时间戳
			"nonceStr": "e61463f8efa94090b1f366cccfbbb444", // 随机串     
			"package": "prepay_id=wx21201855730335ac86f8c43d1889123400",
			"signType": "RSA", // 微信签名方式
			"paySign": "oR9d8PuhnIc+YZ8cBHFCwfgpaK9gd7vaRvkYD7rthRAZ\/X+QBhcCYL21N7cHCTUxbQ+EAt6Uy+lwSN22f5YZvI45MLko8Pfso0jm46v5hqcVwrk6uddkGuT+Cdvu4WBqDzaDjnNa5UK3GfE1Wfl2gHxIIY5lLdUgWFts17D4WuolLLkiFZV+JSHMvH7eaLdT9N5GBovBwu5yYKUR7skR8Fu+LozcSqQixnlEZUfyE55feLOQTUYzLmR9pNtPbPsu6WVhbNHMS3Ss2+AehHvz+n64GDmXxbX++IOBvm2olHu3PsOUGRwhudhVf7UcGcunXt8cqNjKNqZLhLw4jq\/xDg==" // 微信签名 
		 },
		function (res) {
			if (res.err_msg == "get_brand_wcpay_request:ok") {
				// 使用以上方式判断前端返回，微信团队郑重提示：
				// res.err_msg将在用户支付成功后返回ok，但并不保证它绝对可靠。
				// 查看订单状态
				uni.showToast({
					title: '支付成功'
				})
				location.reload()
			} else {
				uni.showToast({
					icon: 'none',
					title: '支付失败'
				})
				uni.redirectTo({
					url: '/pages/xuanzhuang/xuanzhuang'
				})
			}
		}
	)
}

if (typeof WeixinJSBridge == "undefined") {
	if (document.addEventListener) {
		document.addEventListener('WeixinJSBridgeReady', onBridgeReady, false)
	} else if (document.attachEvent) {
		document.attachEvent('WeixinJSBridgeReady', onBridgeReady)
		document.attachEvent('onWeixinJSBridgeReady', onBridgeReady)
	}
} else {
	onBridgeReady()
}

onBridgeReady()