js code case - calcule le jour de la semaine en fonction de la date

<script>function getDayOfWeek(dayValue)  
{   
    var day = new Date(Date.parse(dayValue.replace(/-/g, &#39;/&#39;)));                              
    var today = new Array("星期日","星期一","星期二","星期三","星期四","星期五","星期六");   
    //alert( today[day.getDay()])         
    document.getElementById("xingqiji").value =today[day.getDay()];                                                        
}   
   
document.onreadystatechange = subSomething;//当页面加载状态改变的时候执行这个方法.  
function subSomething()  
{  
  var cObj = DATA_2;  
  cObj.removeAttribute("readOnly");   
  alert("dd");  
     
}  
</script>