修复选择优惠券的bug（每次点击才请求搜索接口，判定优惠券是否存在）

Code Review By Rock Zhang

@@ -67,9 +67,26 @@ $newCoupon.on('submit', function() {
 
 $('#coupon-list').on('touchend', '.employ-main', function() {
     var $this = $(this);
+    var couponCode = $this.data('coupon-code');
 
-    orderInfo('couponCode', $this.data('coupon-code'));
-    orderInfo('couponName', $this.data('coupon-name'));
+    $.ajax({
+        method: 'POST',
+        url: '/cart/index/couponSearch',
+        data: {
+            couponCode: couponCode
+        }
+    }).then(function(res) {
+        if (res.code === 200) {
+            //tip.show('优惠券可用');
+            orderInfo('couponCode', res.data.coupon_code);
+            orderInfo('couponName', res.data.coupon_title);
+            window.location.href = '/cart/index/orderEnsure';
+        } else {
+            tip.show(res.message || '网络错误');
+        }
+    }).fail(function() {
+        tip.show('网络错误');
+    });
 }).on('touchstart', '.employ-main', function() {
     var $this = $(this);
 

@@ -46,9 +46,9 @@
                 <a href="/cart/index/selectCoupon">
                     <span class="title">优惠券</span>
                     {{# coupon}}
-                    <span class="coupon-count">
+                    {{!--<span class="coupon-count">}}
                         {{count}}张可用
-                    </span>
+                    </span>--}}
 
                     {{#if couponName}}
                     <span class="used coupon-use" data-name="{{couponName}}">

@@ -13,7 +13,7 @@
 <script id="tmpl-coupon" type="text/tmpl">
 \{{#coupons}}
     \{{^ notAvailable}}
-    <a class="employ-main" data-coupon-code="\{{ couponCode}}" data-coupon-name="\{{ couponDetailInfomation}}" href="/cart/index/orderEnsure">
+    <a class="employ-main" data-coupon-code="\{{ couponCode}}" data-coupon-name="\{{ couponDetailInfomation}}" href="javascript:void(0);">
         <span>\{{ couponValue}}</span>
         <p class="coupon-name">\{{ couponDetailInfomation}}</p>
         <p>有效期：\{{ couponValidity}}</p>

@@ -485,7 +485,7 @@ class CartModel
             // 优惠券数据
             $coupons = array('couponName' => '');
             if (!empty($orderCompute['coupon_amount'])) {
-                $coupons['couponName'] = $orderCompute['coupon_amount'];
+                $coupons['couponName'] = $orderInfo['couponName'];
             }
             $result['coupon'] = $coupons;
         }