在JavaScript中检查字符串是否为日期

var obj={
  key1:"2015-10-10T11:15:30+0530",
  key2:2015,
  key3:"Normal String"
}

function parseDate(dateStr){
  if(isNaN(dateStr)){ //Checked for numeric
    var dt=new Date(dateStr);
    if(isNaN(dt.getTime())){ //Checked for date
      return dateStr; //Return string if not date.
    }else{
      return dt; //Return date **Can do further operations here.
    }
  } else{
    return dateStr; //Return string as it is number
  }
}

console.log("key1 ",parseDate(obj.key1))
console.log("key2 ",parseDate(obj.key2))
console.log("key3 ",parseDate(obj.key3))