如何使用javascript删除内存中创建的元素

Question

，这是我的情况

顺便说一句，我不想像下面的代码那样将vdom插入到身体DOM中。

  // vdom 
  const alink = document.createElement('a');
  document.body.appendChild(alink);
  alink.click();
  document.body.removeChild(alink);

const virtualDomConvert = (filename = ``) => {
  const svg = document.querySelector(`[id="live_map_svg"]`);
  const clone = svg.cloneNode(true);
  clone.id = 'vdom_svg';
  // autoRemoveAttributes(clone);
  const html = clone.outerHTML;
  // add xml namespace, support browser open preview
  const xml = `
    <?xml version="1.0" encoding="UTF-8"?>
    ${html}
  `.trim();
  const alink = document.createElement('a');
  alink.setAttribute('href', 'data:image/svg+xml;charset=utf-8,' + encodeURIComponent(xml));
  alink.setAttribute('download', filename);
  alink.style.display = 'none';
  const vdom = document.createElement(`div`);
  vdom.appendChild(alink);
  alink.click();
  vdom.removeChild(alink);  
  // ❓ how to delete vdom ???
  // vdom.remove();
  // vdom.parentElement.removeChild(vdom);
}

我试过一些方法，但仍然没有用。

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参考文献

https://developer.mozilla.org/en-US/docs/Web/API/ChildNode/remove

Answer 1

解决方案

I指出，vdom只是在JS环境中，而不是在真正的DOM上下文中，因此很容易删除vdom。

const log = console.log;

const virtualDomConvert = (filename = ``) => {
  const svg = document.querySelector(`[id="live_map_svg"]`);
  const clone = svg.cloneNode(true);
  clone.id = 'vdom_svg';
  // autoRemoveAttributes(clone);
  const html = clone.outerHTML;
  // add xml namespace, support browser open preview
  const xml = `
    <?xml version="1.0" encoding="UTF-8"?>
    ${html}
  `.trim();
  const alink = document.createElement('a');
  alink.setAttribute('href', 'data:image/svg+xml;charset=utf-8,' + encodeURIComponent(xml));
  alink.setAttribute('download', filename);
  alink.style.display = 'none';
  const vdom = document.createElement(`div`);
  vdom.appendChild(alink);
  alink.click();
  vdom.removeChild(alink);
  log(`vdom`, vdom);
  setTimeout(() => {
    delete this.vdom;
    log(`deleted vdom`, vdom);
  }, 3000);
}

如截图所示

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