在jquery中遇到click方法重复多次提交历史操作

$("#unpassBtn").off("click"); //取消每次的点击

$("#unpassBtn").click(function () {

var explainText =$("#explainText").val().trim();

var isPassurl ="../ProcessRecord/isPassToDatabases?explainText=" +explainText +"&recordId=" + recordData.recordId +"&isPass=false" +"&customerId=" +${CUSTOMER_SESSION.customerId};

$.ajax({

url:isPassurl,

success:function () {

confirm("审批不通过！");

/*window.location.replace("../homePage/toTrack?customerId=${CUSTOMER_SESSION.customerId}");*/

            $("#unpassBtn").off("click");//取消每次的点击

            alert("dd");

}

})

})