javascript变量
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>javascript变量</title>
</head>
<body>
<script>
var num = 1,num2 = 2;
num += num2;
document.write(num);
</script>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>javascript变量</title>
</head>
<body>
<script>
var num = 1,num2 = 2;
num += num2;
document.write(num);
</script>
</body>
</html>