onload;readystatechange;DOMContentLoaded事件

当文档的 readyState 属性发生改变时,会触发 readystatechange 事件。

onload 事件会在页面或图像加载完成后立即发生

当纯HTML被完全加载以及解析时,DOMContentLoaded 事件会被触发,而不必等待样式表,图片或者子框架完成加载。

<div class="controls">
  <button id="reload" type="button">Reload</button>
</div>

<div class="event-log">
  <label>Event log:</label>
  <textarea readonly class="event-log-contents" rows="8" cols="30"></textarea>
</div>
const log = document.querySelector('.event-log-contents');
const reload = document.querySelector('#reload');

reload.addEventListener('click', () => {
  log.textContent ='';
  window.setTimeout(() => {
      window.location.reload(true);
  }, 200);
});

window.addEventListener('load', (event) => {
    log.textContent = log.textContent + 'load\n';
});

document.addEventListener('readystatechange', (event) => {
    log.textContent = log.textContent + `readystate: ${document.readyState}\n`;
});

document.addEventListener('DOMContentLoaded', (event) => {
    log.textContent = log.textContent + `DOMContentLoaded\n`;
});

onload;readystatechange;DOMContentLoaded事件

 

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