sold-out-handle

@@ -45,7 +45,9 @@ var $chosePanel = $('#chose-panel'),
 var $productSku = $('#productSku'),
     $buyNumber = $('#buyNumber'),
     $buyNowForm = $('#buyNowForm'),
-    $mnum;
+    $mnum,
+    discountLimit = false,
+    discountNum;
 
 // 购物车编辑标相关变量
 var isEdit,
@@ -86,6 +88,7 @@ function init() {
     curSizeIndex = 0;
     isEdit = 0;
     $mnum = $('#mnum');
+    discountNum = $mnum.val() - 0;
 }
 
 /*
@@ -206,7 +209,8 @@ function hide() {
 //修改加入购物车的文字和背景
 function updateConformButtonClassAndText() {
     $chosed = $allChoseItems.find('.chosed');
-    if (2 === $chosed.closest('.zero-stock').length) {
+    discountLimit = discountNum && $chosed.length === 2 && $('#left-num').val() - 0 < discountNum;
+    if (2 === $chosed.closest('.zero-stock').length || discountLimit) {
         $('#chose-btn-sure').css('background-color', '#c0c0c0').html('已售罄');
     } else if (limitProductCode || ticketsLimit) {
         $('#chose-btn-sure').css('background-color', '#eb0313').html('立即购买');