javascript变量
<!DOCTYPE html>
<html><head>
<title>javascript变量</title>
<meta charset="utf-8"></head>
<body>
<script type="text/javascript">
var a=21,b=21;
z=a+b
document.write(z)
</script >
</body>
</html>
<!DOCTYPE html>
<html><head>
<title>javascript变量</title>
<meta charset="utf-8"></head>
<body>
<script type="text/javascript">
var a=21,b=21;
z=a+b
document.write(z)
</script >
</body>
</html>