document.body.insertAdjacentHTML(position,html);
[插在这里,值为"beforeBegin"]<div id=test>[插在这里,值为"afterBegin"]
层内文字
[插在这里,值为"beforeEnd"]</div>[插在这里,值为"afterEnd"]
document.body.insertAdjacentHTML(position,html);
[插在这里,值为"beforeBegin"]<div id=test>[插在这里,值为"afterBegin"]
层内文字
[插在这里,值为"beforeEnd"]</div>[插在这里,值为"afterEnd"]