node.js中带有异步模块的嵌套For循环
node.js中带有异步模块的嵌套For循环
提问于 2016-10-11 14:13:31
我正在尝试使用async模块执行嵌套的for循环，以处理nightmare回调函数的异步性。因此，简单地说，我所做的就是在同一个node实例中运行几个node对象来浏览网站上的不同链接。
根据我所读过的内容，我必须调用next()函数，以便通知asyncOfSeries循环继续进行下一个索引。这是很好的工作，只有一个循环。当我嵌套asyncOfSeries时，内部next()函数不是在内环上执行，而是在外部循环上执行。
请查看代码片段，以便更好地理解：
var Nightmare = require('nightmare');
var nightmare = Nightmare({show:true})
var complexObject = {
19:["11","12","13","14","15"],
21:["16"],
22:["17"],
23:["18","19"]
};
//looping on each object property
async.eachOfSeries(complexObject, function(item, keyDo, next){
//here im looping on each key of the object, which are arrays
async.eachOfSeries(item, function(indexs, key, nexts){
nightmare
.//do something
.then(function(body){
nightmare
.//do something
.then(function(body2){
nightmare
.//do something
.then(function(body3){
//Here I call next() and expecting to call the next index of the inner loop
//but is calling the next index of the outer loop and the inner for is just
// executing one time.
next();
});
});
});
});
});我试图在内部循环之后调用另一个next()，但正在抛出一个错误。有人知道为什么内环只运行一次吗？
回答 1
Stack Overflow用户
回答已采纳
发布于 2016-10-11 14:57:19
您需要处理两个回调。内部回调“接续”和外部回调“下一步”。您正在从内部循环中调用外部回调。
试试这个：
var Nightmare = require('nightmare');
var nightmare = Nightmare({show:true})
var complexObject = {
19:["11","12","13","14","15"],
21:["16"],
22:["17"],
23:["18","19"]
};
//looping on each object property
async.eachOfSeries(complexObject, function(item, keyDo, next){
//here im looping on each key of the object, which are arrays
async.eachOfSeries(item, function(indexs, key, nexts){
nightmare
.//do something
.then(function(body){
nightmare
.//do something
.then(function(body2){
nightmare
.//do something
.then(function(body3){
//Here I call next() and expecting to call the next index of the inner loop
//but is calling the next index of the outer loop and the inner for is just
// executing one time.
nexts();
});
});
});
});
next();
});页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/39979288
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