JavaScript在20秒后按键盘键

Question

下面的代码打开一个窗口。

我想要什么：

NameEdit窗口打开20秒钟后，自动按键盘上的“ Alt”键。

我该怎么做？ 任何帮助表示赞赏 预先感谢

//Window Base
//The superclass of all windows within the game.
function Window_Base() {
    this.initialize.apply(this, arguments);
}

Window_Base.prototype = Object.create(Window.prototype);
Window_Base.prototype.constructor = Window_Base;

Window_Base.prototype.initialize = function(x, y, width, height) {
    Window.prototype.initialize.call(this);
    this.loadWindowskin();
    this.move(x, y, width, height);
    this.updatePadding();
    this.updateBackOpacity();
    this.updateTone();
    this.createContents();
    this._opening = false;
    this._closing = false;
    this._dimmerSprite = null;
};

W
////////////Name Window

function Window_NameEdit() {
    this.initialize.apply(this, arguments);
}

Window_NameEdit.prototype = Object.create(Window_Base.prototype);
Window_NameEdit.prototype.constructor = Window_NameEdit;

Window_NameEdit.prototype.initialize = function(actor, maxLength) {
    var width = this.windowWidth();
    var height = this.windowHeight();
    var x = (Graphics.boxWidth - width) / 2;
    var y = (Graphics.boxHeight - (height + this.fittingHeight(9) + 8)) / 2;
    Window_Base.prototype.initialize.call(this, x, y, width, height);
    this._actor = actor;
    this._name = actor.name().slice(0, this._maxLength);
    this._index = this._name.length;
    this._maxLength = maxLength;
    this._defaultName = this._name;
    this.deactivate();
    this.refresh();
    ImageManager.reserveFace(actor.faceName());
};