function check(){
    var strd1 = '2011-06-28', strd2 = '2011-06-29'; //改为获取输入控件的值
    if (strd1 == '' || strd2 == '') {alert('日期不能为空！');  return false; }
    var arrd1 = strd1.split('-'), arrd2 = strd2.split('-');
    var d1 = new Date(parseInt(arrd1[0], 10), parseInt(arrd1[1], 10) - 1, parseInt(arrd1[2], 10))
      , d2 = new Date(parseInt(arrd2[0], 10), parseInt(arrd2[1], 10) - 1, parseInt(arrd2[2], 10))
      , now = new Date()
      , d3 = new Date(now.getFullYear(), now.getMonth(), now.getDate());
    if (d1>d3||d2>d3) {
        alert('不能超过当天日期！'); return false;
    }
    if (d1 > d2) { alert('后面的日期不能小于前面的日期！'); return false; }
    return true;
}
check();