JavaScript判断两种格式的输入日期的正确性的代码

function isValidDate(dateStr) {    
        var matchArray = dateStr.match(/^[0-9]+-[0-1][0-9]-[0-3][0-9]$/)    
        if (matchArray == null) {    
          alert("Invalid date: " + dateStr);    
          return false;    
        }    
        return true;    
      }    
function isValidDate(dateStr) { 
        var matchArray = dateStr.match(/^[0-9]+-[0-1][0-9]-[0-3][0-9]$/) 
        if (matchArray == null) { 
          alert("Invalid date: " + dateStr); 
          return false; 
        } 
        return true; 
      }  

<script language=javascript>    
String.prototype.isDate = function()    
{    
   var r = this.match(/^(\d{1,4})(-|\/)(\d{1,2})\2(\d{1,2})$/);     
   if(r==null)return false; var d = new Date(r[1], r[3]-1, r[4]);     
   return (d.getFullYear()==r[1]&&(d.getMonth()+1)==r[3]&&d.getDate()==r[4]);    
}    
alert("2002-01-31".isDate());    
alert("2002-01-41".isDate());    
</script>   
<script language=javascript> 
String.prototype.isDate = function() 
{ 
   var r = this.match(/^(\d{1,4})(-|\/)(\d{1,2})\2(\d{1,2})$/);  
   if(r==null)return false; var d = new Date(r[1], r[3]-1, r[4]);  
   return (d.getFullYear()==r[1]&&(d.getMonth()+1)==r[3]&&d.getDate()==r[4]); 
} 
alert("2002-01-31".isDate()); 
alert("2002-01-41".isDate()); 
</script> 

<script language=javascript>    
String.prototype.isTime = function()    
{    
  var r = this.match(/^(\d{1,4})(-|\/)(\d{1,2})\2(\d{1,2}) (\d{1,2}):(\d{1,2}):(\d{1,2})$/);     
  if(r==null)return false; var d = new Date(r[1], r[3]-1,r[4],r[5],r[6],r[7]);     
  return (d.getFullYear()==r[1]&&(d.getMonth()+1)==r[3]&&d.getDate()==r[4]&&d.getHours()==r[5]&&d.getMinutes()==r[6]&&d.getSeconds()==r[7]);    
}    
alert("2002-1-31 12:34:56".isTime());    
alert("2001-2-29 12:54:56".isTime());    
alert("2002-1-41 12:00:00".isTime());    
</script>