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>