从一个函数中的 request.get 返回变量值到另一个 NODEJS express

Question

我正在调用一个函数，它 request.gets 一些 json 并从我的 router.get 中填充变量

变量在 callFunc 函数中获取它们的值，但它们在我的 router.get 中未定义

如何使它们成为全局的，以便我可以在 request.get 中分配值并使用 router.get 中的值

var title;
var headline;

router.get('/test/code/:code', function(req, res, next){
var procedure = "EXECUTE procedureName 999, 'userName', "+req.params.code
callFunc(procedure)     

  res.render('display', { 
    title: title,           // <-- This value here is undefined
    descritpion: headline,  // <-- This value here is undefined
    var1: 'block sidebar',
    var2: 'block content',
    image: 'http://baidun.com/wp-content/uploads/2013/06/SI_RM_1070bw-900x598.jpg',
    url: 'https://www.youtube.com/watch?v=ZB_VPDXAhKU'

  })
})


function callFunc(procedure){
request.get('http://myWebservice.com/myService.asmx/myServiceDB?callback=&userName=username&procedureName='+procedure, function(req, res, body){

    var testValue = body.slice(1, -2);
    var result1 = JSON.parse(testValue);
    var result2 = JSON.parse(result1);
    title = result2.jobSelect[0].jobTitle;
    headline = decodeURI(result2.jobSelect[0].jobHeadline);
    console.log(title)     // <-- I get the right value here
    console.log(headline)  // <-- I get the right value here
})
}

Answer 1

应该不需要全局范围内的数据。您可以简单地使用带有回调的 callFunc，然后将数据对象传回。

router.get('/test/code/:code', function(req, res, next){
    var procedure = "EXECUTE procedureName 999, 'userName', "+req.params.code
    callFunc(procedure, function(obj) {     
        res.render('display', { 
            title: obj.title,           
            descritpion: obj.headline,
            var1: 'block sidebar',
            var2: 'block content',
            image: 'http://baidun.com/wp-content/uploads/2013/06/SI_RM_1070bw-900x598.jpg',
            url: 'https://www.youtube.com/watch?v=ZB_VPDXAhKU'
        });
    });
});

function callFunc(procedure, callback){
    request.get('http://myWebservice.com/myService.asmx/myServiceDB?callback=&userName=username&procedureName='+procedure, function(req, res, body){
        var testValue = body.slice(1, -2);
        var result1 = JSON.parse(testValue);
        var result2 = JSON.parse(result1);
        var obj = {
            title: result2.jobSelect[0].jobTitle,
            headline: decodeURI(result2.jobSelect[0].jobHeadline)
        };
        callback(obj);
    })
}

Answer 2

一种简单的方法是使用 res.render 作为回调。

var title;
var headline;

router.get('/test/code/:code', function(req, res, next){
var procedure = "EXECUTE procedureName 999, 'userName', "+req.params.code
callFunc(procedure, function(title, headline) {     

  res.render('display', { 
    title: title,           
    descritpion: headline,
    var1: 'block sidebar',
    var2: 'block content',
    image: 'http://baidun.com/wp-content/uploads/2013/06/SI_RM_1070bw-900x598.jpg',
    url: 'https://www.youtube.com/watch?v=ZB_VPDXAhKU'

  })
})
})


function callFunc(procedure, cb){
request.get('http://myWebservice.com/myService.asmx/myServiceDB?callback=&userName=username&procedureName='+procedure, function(req, res, body){

    var testValue = body.slice(1, -2);
    var result1 = JSON.parse(testValue);
    var result2 = JSON.parse(result1);
    title = result2.jobSelect[0].jobTitle;
    headline = decodeURI(result2.jobSelect[0].jobHeadline);
    cb(title, headline);
})
}