javascript - nodejs promise then里面的函数传参报错undefined-PHP中文网问答

我按照下面这段示例代码写了一段代码

var promise=require("bluebird")

var promise = new Promise(function(resolve, reject) {
  resolve(1);
});

promise.then(function(val) {
  console.log(val); // 1
  return val + 2;
}).then(function(val) {
  console.log(val); // 3
});

以下是我写的

var http=require("http")
var fs=require("fs")
var promise=require("bluebird")
var directory="D:/ccav/"

function handle_incoming_request(req,res){
    load_album_list_async(directory).then(isDir_async(filesArray)).then(function(onlyDirArray){
        var opt={"error":null,data:onlyDirArray}
        console.log("请求："+req.method+" "+req.url);
        res.writeHead(200,{"Content-type":"application/json","Charset":"UTF-8"});
        res.end(JSON.stringify(opt)+"\n");
    }).catch(function(err){console.error(err)})
}


function load_album_list_async(dir){
    return new promise(function(resolve,reject){
        fs.readdir(dir,function(err,filesArray){
            if(err){reject(err)}else{resolve(filesArray)}
        })
    })
}

function isDir_async(filesArray){
    return new promise(function(resolve,reject){
        var onlyDirArray=[];
        for(var i=0;i


运行会报错，去掉中间的then就没问题：
load_album_list_async(directory).then(isDir_async(filesArray)).then(function(onlyDirArray){
                                                                            ^
ReferenceError: filesArray is not defined

在网上搜了半天也没有类似的代码可以参考，求大神指点，我应该怎么写？

function isDir_async(filesArray){ return new promise(function(resolve,reject){ var onlyDirArray=[]; for(var i=0;i<filesArray.length;i++){ fs.stat(filesArray[i],function(err,stats){ if(stats.isDirectory()){ onlyDirArray.push(filesArray[i]); } }) } resolve(onlyDirArray) }) }

function isDir_async(filesArray) { return new promise(function(resolve, reject) { var onlyDirArray = new Array(); (function iterator(index) { console.log("当前index的值："+index) if (index == filesArray.length) { resolve(onlyDirArray) console.log("onlyDirArray的内容是"+onlyDirArray) } else { fs.stat(directory + filesArray[index], function(err, stats) { if (err) { console.error(err) } else { if (stats.isDirectory()) { onlyDirArray.push(filesArray[index]); } iterator(index + 1) } }) } })(0) }) }