javascript - 如何在 JavaScript 中创建对象构造函数；

Question

你能解释一下下面的代码有什么问题吗？

function box (width, height, color) {
    this.width=width;
    this.height=height;
    this.color=color;
    this.style.width=width;
    this.style.height=height;
    this.style.backgroundColor=color;
}

var box1 = new box (100, 100, 'red');

document.body.appendChild(box1);

Answer 1

您需要 createElement并将参数传递给它，如下所示:

function box (width, height, color) {
  this.element = document.createElement('div');
  this.element.style.width=width+'px';
  this.element.style.height=height+'px';
  this.element.style.backgroundColor=color;
  return this.element;
}

var box1 = box (100, 100, 'red');

document.body.appendChild(box1);