getDirList(){
                plus.io.resolveLocalFileSystemURL(
                "/sdcard/Record/Call", //指定的目录
                function(entry) {
                    var directoryReader = entry.createReader(); //获取读取目录对象
                    directoryReader.readEntries(
                        function(entries) { //历遍子目录即可
                            for (var i = 0; i < entries.length; i++) {
                                console.log("文件信息：" + entries[i].name);
                            }
                        },
                        function(err) {
                            console.log("访问目录失败");
                        });
                },
                function(err) {
                    console.log("访问指定目录失败:" + err.message);
                });
    
            },

摘自：https://blog.csdn.net/Lpandeng/article/details/109640185