第一个JavaScript变量
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>JavaScript</title>
<script type="text/javascript" src="js/index.js"></script>
<script type="text/javascript">
var a=1;
//while循环
while(a<9){
document.write("<br/>");
document.write(a);
a=a+1;
}
document.write("<hr>");
// do..while循环
var b=1;
do{
document.write("<br/>");
document.write(b);
b=b+1;
}while(b<10);
</script>
</head>
<body>
</body>
</html>