​x
 
<!DOCTYPE html>
<html>
<body>
​
<h1>JavaScript 正则表达式</h1>
​
<p>将“microsoft”替换为以下段落中的“W3School”：</p>
​
<button onclick="myFunction()">试一试</button>
​
<p id="demo">Please visit Microsoft and Microsoft!</p>
​
<script>
function myFunction() {
  var str = document.getElementById("demo").innerHTML; 
  var txt = str.replace(/microsoft/i,"W3School");
  document.getElementById("demo").innerHTML = txt;
}
</script>
​
</body>
</html>
​