截流

//Set up a flow control switch
$(".m-cartItemToCalculate_btn").on("click",function(){
    var that=$(this);
    var numChangeId = that.attr('id');
    var valItem=that.parent(".m-cartItemToCalculate").find("input[name='quantity']");
    if(numChangeId == 'num-reduce' && valItem.val()<=1){
        switchCalculate(that);
    }else{
        ajaxUpdate(that);
    }
});

function throttle1(func, wait) {
    let timeout;
    return function(){
     let context = this;
     let args = arguments;
       if (!timeout) {
         timeout = setTimeout(() => {
          timeout = null;
          func.apply(context, args)
         }, wait)
       }
     }
};
            
function switchCalculate(proItem){
     var numChangeId = proItem.attr('id');
     var valItem=proItem.parent(".m-cartItemToCalculate").find("input[name='quantity']");
     console.log(valItem.val()+"valItem");
     if(numChangeId == 'num-reduce'){
       $("#num-increase").removeAttr("disabled");
       if( valItem.val() <= 1 ){
          $(".o-maskLayer-cartList").css("display","block");
          $(".o-maskLayer-cartList").find($(".a-radioOn")).attr("checked","checked");
          $(".o-maskLayer-cartList").find($(".a-radioOff")).removeAttr("checked");
          var removeId = proItem.attr("removeflag");
          $(".a-remove-btn").attr("removeId", removeId);
          valItem.value = 1;
          return false;
       }else{
          valItem.val(parseInt(valItem.val()) - 1);
       }
     }else if(numChangeId == 'num-increase'){
       proItem.parents(".flexBox").next(".Msgitemlimit-phone").hide();
       proItem.removeAttr("disabled");
       valItem.val(parseInt(valItem.val()) + 1);
     }
}
function ajaxUpdate(obj) {
    switchCalculate(obj);
    throttle1(setAjax, 1000)(obj);
}
function setAjax(obj) {
    var guid=obj.parents(".o-cartItemDetailsWrap").find(".a-guidval").val();
    var productCode=obj.parents(".o-cartItemDetailsWrap").find(".a-productCode").html();
    var newquantity = obj.parent(".m-cartItemToCalculate").find("input[name='quantity']").val();
    var oldQty=obj.parent(".m-cartItemToCalculate").find("input[name='quantity']").attr("old");
    var param = [{
        "product": {
           "code": productCode
            },
           "quantity": newquantity
        }];
        $.ajax({
          type:"post",
          url:"updateEntry/"+guid,
          data:JSON.stringify(param),
          datatype:"json",
          contentType: "application/json; charset=utf-8",
          success:function(res){
            if(res.success){
              for(var i=0;i<res.data.entries.length;i++){
                if(res.data.entries[i].guid==guid){
                  var resWebprice = res.data.entries[i].price.totalwebPriceFmt;
                  var resSaleprice = res.data.entries[i].price.totalPriceWithoutCouponFmt;
                  obj.parents(".o-cartItemDetailsWrap").find("input[name='quantity']").attr("old",newquantity);
                  //obj.parents(".o-cartItemDetailsWrap").find("input[name='quantity']").val(newquantity);
                  obj.parents(".o-cartItemDetailsWrap").find(".m-cartItemPrice_webprice .a-webprice").html(resWebprice);
                  obj.parents(".o-cartItemDetailsWrap").find(".m-cartItemPrice_saleprice .a-saleprice").html(resSaleprice);}
                }
             }else{
                for(var i=0;i<res.error.length;i++){
                console.log(res.error[i].message+"error msg!");
                globalErrorMsgForCMS("",res.error[i].message);
             }
             obj.parents(".o-cartItemDetailsWrap").find("input[name='quantity']").val(oldQty);
            }
         },
         error:function(){
           console.log("Update failed!");
           obj.parents(".o-cartItemDetailsWrap").find("input[name='quantity']").val(oldQty);
         }
      })
};

function globalErrorMsgForCMS(errKey, errMsg) {
    if(errKey){
        $(".errorMsg").css("display","block").html(errorMsgJson[errKey]);
    } else {
        $(".errorMsg").css("display","block").html(errMsg);
    }
}