下面的脚本的任务是扫描给定的目录并找出其中有多少个文件（或字符）。然后，它创建与文件总数相等的按钮。目前我的问题是，在运行时我无法知道哪个按钮被按下。
extends Control
# 要导入的字符数量
var characters = 0
# 所有可用字符的文件名
var files = []
# 与这些字符关联的按钮
var array = []
# 当节点首次进入场景树时调用。
func _ready():
    scan_directory()
    populate()
    setup()
# 扫描文件夹中的字符数量
func scan_directory():
    var current = ""
    var dir = DirAccess.open("res://Characters/")
    dir.list_dir_begin()
    current = dir.get_next()
    while current != "":
        files.push_back(current)
        current = dir.get_next()
    print(files)
    characters = files.size()
func setup():
    var x = 0
    for i in characters:
        var but = array[x]
        var path = "res://Characters/" + files[x] + "/" + files[x] + ".gd"
        var char = load(path)
        var dic = char.import()
        x += 1
# 创建与字符数量相等的按钮
func populate():
    var x = 100
    var y = 100
    var texture = Texture2D.new()
    texture = load("res://img/button.jpg")
    for i in characters:
        var but = Button.new()
        var path = load("res://Scripts/Character_Select.gd")
        add_child(but)
        but.pressed.connect(self.export)
        but.set_position(Vector2(x, y))
        but.set_button_icon(texture)
        x += 250
        if x > 1250:
            x = 100
            y += 250
        array.push_back(but)
    print(array)
func export():
    var temp = self.get_instance_id()
    print("当前ID：" + str(temp))

but.pressed.connect(self.export)

but.pressed.connect(self.export.bind(1))

def export(data):
    print(data)
    # ...

for i in blahblahblah:
    # ...
    # 一些操作
    # ...
    but.pressed.connect(self.export.bind(i))
    # ...
    # 其他操作
    # ...