Merge branch 'feature/oneset' into release/5.3.1

@@ -488,6 +488,10 @@ $yohoPage.on('touchstart', '.btn-minus', function() {
         return;
     }
 
+    if ($mnum.length > 0 && num <= parseInt($mnum.val(), 10) + 1) {
+        $('.btn-minus').addClass('discount-gray');
+    }
+
     if ($mnum.length > 0 && num <= parseInt($mnum.val(), 10)) {
         tip.show('量贩商品，' + $mnum.val() + '件起购');
         return;
@@ -513,6 +517,10 @@ $yohoPage.on('touchstart', '.btn-minus', function() {
         return;
     }
 
+    if ($mnum.length > 0 && num >= parseInt($mnum.val(), 10)) {
+        $('.btn-minus').removeClass('discount-gray');
+    }
+
     if (num - 0 === leftNum || 0 === leftNum) {
         return;
     }

@@ -45,7 +45,7 @@
                 <div class="num">
                     <span>数量</span>
                     <div class="clearfix">
-                        <a class="btn btn-minus {{#if mnum}}discount-gray{{/if}}" href="javascript:void(0);">
+                        <a class="btn btn-minus {{#if discountBuy}}discount-gray{{/if}}" href="javascript:void(0);">
                             <span class="iconfont {{#if promotionId}}disabled{{/if}}">&#xe625;</span>
                         </a>
                         {{#if discountBuy}}