​x
 
<!DOCTYPE html>
<html>
<body>
​
<ul><li>Coffee</li><li>Tea</li></ul>
​
<p id="demo">请点击按钮来改变某个列表项的文本。</p>
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<button onclick="myFunction()">试一下</button>
​
<script>
function myFunction()
{
var list = document.getElementsByTagName("UL")[0]
list.getElementsByTagName("LI")[0].innerHTML = "Milk";
}
</script>
​
</body>
</html>
​