增加单独禁用stepper input功能 (#146)

* fix: sku message key

* fix: 改用goods_id当key

* fix: 漏改一处

* feat: 增加单独禁用stepper input功能

* fix: update doc

* fix: rename spec file

packages/sku/components/SkuStepper.vue

@@ -2,7 +2,14 @@
   <div class="van-sku-stepper-stock">
     <div class="van-sku-stepper-container">
       <div class="van-sku__stepper-title">{{ stepperTitle }}：</div>
-      <van-stepper v-model="currentNum" :min="1" :max="stepperLimit" class="van-sku__stepper" @overlimit="handleOverLimit"></van-stepper>
+      <van-stepper
+        class="van-sku__stepper"
+        v-model="currentNum"
+        :min="1"
+        :max="stepperLimit"
+        :disableInput="disableStepperInput"
+        @overlimit="handleOverLimit">
+      </van-stepper>
     </div>
     <div v-if="!hideStock" class="van-sku__stock">剩余{{ stock }}件</div>
     <div v-if="quota > 0" class="van-sku__quota">每人限购{{ quota }}件</div>
@@ -34,6 +41,10 @@ export default {
       type: Boolean,
       default: false
     },
+    disableStepperInput: {
+      type: Boolean,
+      default: false
+    },
     stepperTitle: {
       type: String,
       default: DEFAULT_BUY_TEXT