如何动态动态修改网页中的一段文字

Question

<div id="mydiv">hello</div>
<input type="button" onclick="javascript:mydiv.innerText='你好';">

Answer 1

<div id="mydiv">hello</div>
<input type="button" onclick="javascript:mydiv.innerText='你好';" value="click_here">

Answer 2

<div id="mydiv">
<span CONTENTEDITABLE=true>hello</span>
</div>
<input type="button" onclick="javascript:document.write(mydiv.innerText);" value="click_here">

Answer 3

<div id="mydiv"><span contenteditable=true>hello</span></div>
<input type="button" onclick="javascript:alert(mydiv.innerText);" value="click_here">