问：

我的目标是有一个按钮，当单击该按钮时，它将创建一个闪烁的对象，方法是使用切换和设置超时，然后将该对象附加到 HTML 上。但是，我在 Javascript 代码中收到“无法读取未定义的属性'切换'”错误消息。

用于创建对象的 JS

var MakeSquare = function (top, left, time) {
    this.time = time;
    this.$node = $('<span class="square"></span>');
    this.setPosition(top, left);
    this.repeat();
}

// this function will set the position of the <span> on the webpage
MakeSquare.prototype.setPosition = function (top, left) {
  var styleSettings = {
    top: top,
    left: left
  };
  this.$node.css(styleSettings);
};

// this function will toggle the <span> off, and invoke the repeat function to turn it back on again, and so forth.
MakeSquare.prototype.step = function() {
  this.$node.toggle();
  this.repeat();
}

MakeSquare.prototype.repeat = function () {
  setTimeout(this.step, this.time)
}