js判断选择时间不能小于当前时间的示例代码

varcontroldate;
functioncheckDate(){
controldate=document.getElementById("sendDate").value;
if(controldate==""){
alert("日期不能为空");
returnfalse;
}else{
varday=newDate();varYear=0;
varMonth=0;
varDay=0;
varCurrentDate="";
//初始化时间
Year=day.getFullYear();
Month=day.getMonth()+1;
Day=day.getDate();

CurrentDate+=Year+"-";

if(Month>=10)
{
CurrentDate+=Month+"-";
}
else
{
CurrentDate+="0"+Month+"-";
}
if(Day>=10)
{
CurrentDate+=Day;
}
else
{
CurrentDate+="0"+Day;
}//alert(CurrentDate);//当前日期

varstartDate=newDate(CurrentDate.replace("-",",")).getTime();
varendDate=newDate(controldate.replace("-",",")).getTime();if(startDate>endDate)
{
alert("选择日期不能小于当前日期！");
document.getElementById("sendDate").focus();
returnfalse;
}else{
returntrue;
}
}
}