javascript变量的声明
<!DOCTYPE html>
<html>
<head>
<title>变量的声明</title>
</head>
<body>
<div id="timeId"></div>
<script type="text/javascript">
var m_day=new Date();
document.write(m_day+'<br>');
var str='I study php';
document.write(str);
var number=100;
document.write(number);
</script>
</body>
</html>