摘要：<!DOCTYPE html><html><head> <meta charset="utf-8"> <title></title> <!-- <script type="text/javascript"> document.write("Hello Wor
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<!-- <script type="text/javascript">
document.write("Hello World!");
</script> -->
<!-- <script type="text/javascript" src="index.js"></script> -->
</head>
<body>
<script type="text/javascript">
document.write("javascript的变量<br>");
var x=2,y=6;
z=x+y;
document.write(z);
</script>
</body>
</html>
批改老师：西门大官人批改时间：2019-03-03 10:22:34
老师总结：js中的变量分为全局变量和局部变量，你这里定义的是全局变量，最好也定义一下局部变量，并说明一下它们的不同
