例题：将“Paul；Puala，Pauline，paul，Paul”中的Paul替换成Ringo
<!DOCTYPE html>
<html>
<body>
<p>将下文中"Paul"全部替换成"Ringo"：</p>
<button onclick="myFunction()">Try it</button>
<p id="mark">Paul,Puala,Pauline,paul,Paul</p>
<script>
function myFunction()
{
var str = document.getElementById("mark").innerHTML;
var txt = str.replace(/Paul/g,"Ringo"）;
document.getElementById("mark").innerHTML = txt;
}
</script>
</body>
</html>