1function onBridgeReady() {
2    WeixinJSBridge.invoke('getBrandWCPayRequest', {
3        "appId": "wx2421b1c4370ec43b",     //公众号ID，由商户传入     
4        "timeStamp": "1395712654",     //时间戳，自1970年以来的秒数     
5        "nonceStr": "e61463f8efa94090b1f366cccfbbb444",      //随机串     
6        "package": "prepay_id=up_wx21201855730335ac86f8c43d1889123400",
7        "signType": "RSA",     //微信签名方式：     
8        "paySign": "oR9d8PuhnIc+YZ8cBHFCwfgpaK9gd7vaRvkYD7rthRAZ\/X+QBhcCYL21N7cHCTUxbQ+EAt6Uy+lwSN22f5YZvI45MLko8Pfso0jm46v5hqcVwrk6uddkGuT+Cdvu4WBqDzaDjnNa5UK3GfE1Wfl2gHxIIY5lLdUgWFts17D4WuolLLkiFZV+JSHMvH7eaLdT9N5GBovBwu5yYKUR7skR8Fu+LozcSqQixnlEZUfyE55feLOQTUYzLmR9pNtPbPsu6WVhbNHMS3Ss2+AehHvz+n64GDmXxbX++IOBvm2olHu3PsOUGRwhudhVf7UcGcunXt8cqNjKNqZLhLw4jq\/xDg==" //微信签名 
9    },
10    function(res) {
11        if (res.err_msg == "get_brand_wcpay_request:ok") {
12            // 使用以上方式判断前端返回,微信团队郑重提示：
13            //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。
14        }
15    });
16}
17if (typeof WeixinJSBridge == "undefined") {
18    if (document.addEventListener) {
19        document.addEventListener('WeixinJSBridgeReady', onBridgeReady, false);
20    } else if (document.attachEvent) {
21        document.attachEvent('WeixinJSBridgeReady', onBridgeReady);
22        document.attachEvent('onWeixinJSBridgeReady', onBridgeReady);
23    }
24} else {
25    onBridgeReady();
26}