调用支付宝

var pays = {};
var w = null;
mui.plusReady(function() {
//  $.init({});
    plus.payment.getChannels(function(channels) { //获取支付通道
        for(var i in channels) {
            var channel = channels[i];
            // 过滤掉不支持的支付通道：暂不支持360相关支付
            if(channel.id == 'qhpay' || channel.id == 'qihoo'||channel.id=='wxpay') {
                continue;
            }
            pays[channel.id] = channel;
            //checkServices(channel); //检查服务是否安装
        }
    }, function(e) {
        alert("获取支付通道失败", "系统提示");
    });
    document.getElementById("ensure").addEventListener("tap", function() {
        w = plus.nativeUI.showWaiting();
        var xhr = new XMLHttpRequest();
        xhr.open("GET","url");
        xhr.send();     
        xhr.onreadystatechange = function() {
            if (xhr.readyState==4 && xhr.status ==200) {
                console.log(xhr.responseText);      
                var My = JSON.parse(xhr.responseText);
                console.log(My);
                var order = My.data;
                console.log(order);
                plus.payment.request(pays['alipay'],order,function(result) {
                    console.log(result);
                })   
            }
        };
    });
});