<script type='text/javascript'>
window.onload =function(){
    if(window.name == null || window.name == ""){
        window.name = "enter";
        alert('0');
    }else{
        alert('1');
    }
} 
</script>

------解决方案--------------------
sorry我描述的不清楚  
-------------------------
你描述的还是不清楚