计算上班时间，除周末

function cctian()
{
var starttime = document.getElementById("starttime").value;
var endtime = document.getElementById("endtime").value;
var day= document.getElementById("day").value;
var day =Number(day) + 1 ;
var st = starttime.replace(/:/g,'-');
st = st.replace(/ /g,'-');
var st = st.split("-");
var st = new Date(Date.UTC(st[0],st[1]-1,st[2],st[3]-8,st[4],st[5]));
var starttimes = st.getTime()/1000;
var sx = st.getDay();
var en = endtime.replace(/:/g,'-');
en = en.replace(/ /g,'-');
var en = en.split("-");
var en = new Date(Date.UTC(en[0],en[1]-1,en[2],en[3]-8,en[4],en[5]));
var endtimes = en.getTime()/1000;
var zz = 0;
for(;starttimes<=endtimes;starttimes=starttimes+86400)
{
    var s=new Date(parseInt(starttimes) * 1000).toLocaleString().replace(/年|月/g, "-").replace(/日/g, " ");
    var s = s.replace(/:/g,'-');
    s = s.replace(/ /g,'-');
    var s = s.split("-");
    var st = new Date(Date.UTC(s[0],s[1]-1,s[2],s[3]-8,s[4],s[5]));
    var sx = st.getDay();
    if (sx == 6 || sx == 0)
    {
      ++zz;
    }
}
var worktime=day-zz;
document.getElementById("test").value = worktime;
}

计算一段时间的上班时间，除去周末

2个输入框 "starttime","endtime"得到开始和结束时间

day输入框得到"starttime","endtime"的时间天数差

最后把worktime时间赋值到test输入框上