javascript 1.5s跳转

<script type="text/javascript">
    var t = 1.5;
    window.onload=countDown;
    function countDown(){
        var time = 5;
        t--;
        time.value=t;
        if (t<=0) {
        location.href="${ROOT_PATH }VipOrder/index";
        };
    }
    var inter = setInterval("countDown()",1000);
</script>