Question

我想将3个不同的promises中的数据传递给nodejs中的render函数，以便与pug一起使用。

var promise = require('promise');

var statusChart = new promise(function (resolve, reject) {
            a.aggregate(
            [
                {
                    $group: {
                        _id: '$status',
                        count: {$sum: 1}
                    }
                }
            ], function (err, status) {
                if (err) {
                    console.log(err);
                    reject(err);
                } else {
                    resolve(status);
                }
            });
        });

        var severityChart = new promise(function (resolve, reject) {
            a.aggregate(
            [
                {
                    $group: {
                        _id: '$severity',
                        count: {$sum: 1}
                    }
                }
            ], function (err, vuln) {

                if (err) {
                    console.log(err);
                    reject(err);
                } else {
                    resolve(vuln);
                }
            });
        })

        var countChart = new promise(function (resolve, reject) {
            a.count(function (err, count) {
                if (err) {
                    console.log(err);
                    reject(err);
                } else {
                    resolve(count);
                }
            });
        })

        statusChart.then((message) => {
            console.log(message);
        });

        severityChart.then((data) => {
            console.log(data);
        });

        countChart.then((item) => {
            console.log(item);
        });

上面的代码工作正常，将返回我的结果

[ { _id: 'Medium', count: 6 },
  { _id: 'High', count: 15 },
  { _id: 'Low', count: 1 } ]
[ { _id: 'New', count: 1 },
  { _id: 'Closed', count: 1 },
  { _id: 'In Progress', count: 11 },
  { _id: 'Pending', count: 9 } ]
22

问题：如何在渲染功能中传递此数据。

res.render（'graphs'，{info：statusChart，vuln：severityChart，count：countChart}）;

当我以这种方式尝试时，我会在哈巴狗那边得到以下结果

Answer 1

您正在将promises传递给info，vuln和count变量。那时候还没有解决。要使其正常工作，请执行以下操作

....
return Promise.all([statusChart, severityChart, countChart])
       .then(([statusChartVal,severityChartVal,countChartVal]) => {
         return res.render('graphs', {info: statusChartVal, vuln: 
                severityChartVal, count: countChartVal});
       });
....

Answer 2

新承诺（（解决，拒绝）=＆gt; { //做点什么//

      return new Promise((resolve, reject) => {
                            //Do Something //
                         Resolve(true); 
                        });
                 Promise.all(Promise).then((responses) => {
                        resolve({
                            status: true,
                            data: data   
                        });
                 });                    
    }).then((response) => {
        res.json(response);
    });

将多个Promise传递给Node JS渲染

2 个答案: