​x
 
<!DOCTYPE html>
<html>
<body>
​
<h1>JavaScript 字符串方法</h1>
​
<p>请把下面的段落中的“Microsoft”替换为“W3School”：</p>
​
<button onclick="myFunction()">试一试</button>
​
<p id="demo">请访问 Microsoft！</p>
​
<script>
function myFunction() {
  var str = document.getElementById("demo").innerHTML; 
  var txt = str.replace("Microsoft","W3School");
  document.getElementById("demo").innerHTML = txt;
}
</script>
​
</body>
</html>
​