想象一下,有一个在页面上生成内容的类.部分内容应该在html中附加事件监听器,例如onclick = function().

如何确保从构造html的类中调用该函数？

class Container {
  constructor(hook) {
    this.hook = "#" + hook;
    this.addDiv = this.addDiv.bind(this);
    this.fireMe = this.fireMe.bind(this);
    this.init = this.init.bind(this);
    this.init();
  }
  addDiv() {
    const div = `<div onclick="fireMe()">FIRE ME</div>`;
    document.querySelector(this.hook).innerHTML = div;
  }
  fireMe() {
    console.log("hello!");
  }
  init() {
    this.addDiv();
  }
}

let div = new Container("app");

现在得到fireMe未定义的错误(这是正确的,因为它在全局范围内不可用).

我知道我可以通过首先渲染div而不是添加事件监听器来添加事件监听器,但是有没有办法从< div>中添加事件监听器.标签实际到达Container.fireMe()方法？

解决方法:

你必须创建元素 – >这样的事情

class Container {
  constructor (hook) {
    this.hook = '#' + hook;
    this.addDiv = this.addDiv.bind(this);
    this.fireMe = this.fireMe.bind(this);
    this.init = this.init.bind(this);
    this.init();
  }

  addDiv () {
    const div = document.createElement('div');
    div.textContent = 'FIRE ME';
    div.addEventListener('click', this.fireMe );
    document.querySelector(this.hook).innerHTML = div;
  }

  fireMe () {
    console.log('hello!');
  }

  init () {
    this.addDiv();
  }
}

const div = new Container('app');