字母的转换
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>字母的转换</title>
</head>
<body>
<button onclick="myFunction()">点击转换</button>
<p id="demo">Paul,Paula,Pauline,paul,Paul</p>
<script>
function myFunction() {
var str = document.getElementById("demo").innerHTML;
var txt = str.replace(/Paul\b/g,"Ringo");
document.getElementById("demo").innerHTML = txt;}
</script>
</body>
</html>