node.js中的async.eachSeries [英] async.eachSeries in node.js

问题描述

我在中有一个循环node.js

for (var i in files){
    var all = fs.readdirsync("./0");
    async.eachSeries(all, function(item){
        check(item); 
   }
}

check（item）有一个回调给另一个函数。

The check(item) has a callback to another function.

正如我所看到的， async.eachSeries 不会同步执行。循环继续执行其他项，在 check（）函数完成。

As I can see, the async.eachSeries doesn't execute synchronously. The loop continues to execute the other items, before the callback in the check() function is finish.

如何让循环等到迭代完成（包括回调）？

How do I make the loop wait until the iteration is finished (including the callback)?

推荐答案

假设检查接受回调，我们可以使用 mapSeries 实现这一目标。

Assuming check accepts a callback, we can use mapSeries to achieve that.

async.mapSeries(files, function(file, outerCB) {
  var all = fs.readdirsync("./0");
  async.mapSeries(all, function(item, cb){
      check(item, cb);
  }, outerCB);
}, function(err, results) {
  // This is called when everything's done
});

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