innerHTML,outerHTML的区别

innerHTML,和outerHTML好像都能动态改变网页内容,他们有什么区别吗
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举个例子:

1<span id="a"><b>aa</b></span>

document.all.a.innerHTML == "

1<b>aa</b>

" //不包括标签自身
document.all.a.outerHTML == "

1<span id="a"><b>aa</b></span>

" //包括标签自已

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