<html>
<body>
<p>替换 "Microsoft" 为 "W3cSchool" :</p>
<button onclick="myFunction()">点我</button>
<p id="demo">Please visit Microsoft!</p>
<script>
function myFunction() {
var str = document.getElementById("demo").innerHTML;
var txt = str.replace("Microsoft","W3cSchool");
document.getElementById("demo").innerHTML = txt;
}
</script>
</body>
</html>