​x
 
<!DOCTYPE html>
<html>
<head>
<link id="myLink" href="hichina.html" hreflang="zh-cn">
</head>
<body>
​
<p>单击该按钮可更改链接文档的语言代码。</p>
​
<button onclick="myFunction()">试一试</button>
​
<p id="demo"></p>
​
<script>
function myFunction() {
  document.getElementById("myLink").hreflang = "en-us";
  document.getElementById("demo").innerHTML = "语言代码已从 “zh-cn” 更改为 “en-us”。";
}
</script>
​
</body>
</html>
​