菜鸟教程在线编辑器

 
                <!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(runoob.com)</title>
</head>
<body>

<script>
var str="The rain in Spain stays mainly in the plain";
var patt1=/ain/g;

while (patt1.test(str)==true) 
{
	document.write("'ain' found. Index now at: "+patt1.lastIndex);
	document.write("<br>");
}
</script>

</body>
</html>
              