Merge branch 'feature/bundleToCart' into release/5.6

@@ -57,7 +57,8 @@ class ChosePanel {
             this.maxBuyNum = this.data.cartInfo.limit || 0; // 0表示不限制购买
             this.skus = this.data.cartInfo.skus || [];
             this.props = this.data.cartInfo.props || [];
-            this.buyNum = this.minBuyNum = this._defaultBuyNum();
+            this.buyNum = this._defaultBuyNum();
+            this.minBuyNum = (this.modes.discount && this.data.discountBuy.num) || 1;
             this.setting = {
                 disableNum: this.disableNum,
                 noChoseText: `请选择${this.props.map(prop => prop.name).join('、')}`,