indexOf()是个什么意思？
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>string对象 </title>
<script type="text/javascript">
var mystr="Hello World!"
document.write(mystr.indexOf('o',mystr.indexOf('o')+1)));
</script>
</head>
<body>
</body>
