html 自动生成数字------document.write(c) js写在 html里面

<script>
function getnum(){var a = Math.round(Math.random()*100);if(a < 50){a = getnum()}return a;}

document.write(getnum());
</script>

<script type="text/javascript">

var d = new Date()
var c=31-d.getDate()
document.write(c)

</script>