<span id="span1" class="footer_left"></span>
function sitnumber() {
    var t = setInterval(function () {
      if (typeof (Storage) !== "undefined") {
        if (sessionStorage.clickcount) {
          sessionStorage.clickcount = Number(sessionStorage.clickcount) + 1;
        } else {
          sessionStorage.clickcount = 1;
        }
        if (sessionStorage.clickcount == 181) {
          // alert("dao10le")
          clearInterval(t);
          sessionStorage.clear()
          return;
        } else {
          document.getElementById("span1").innerHTML = sessionStorage.clickcount;
        }
      }
    }, 1000);
  }
  chakan()
  function chakan() {
    var span1 = sessionStorage.clickcount;
    console.log(span1)
    if (span1 < 180) {
      sitnumber()
    }
  }