feat(MB): 添加 MBLoading 组件

components/MB/MBLoading.vue

@@ -0,0 +1,33 @@
+<template>
+    <view class="loading">
+        <uni-load-more
+            :contentText="{
+                contentrefresh: 'loading...',
+            }"
+            :status="'loading'"
+        />
+    </view>
+</template>
+
+<script setup>
+import {defineOptions} from 'vue'
+
+defineOptions({
+    name: 'MBLoading'
+})
+</script>
+
+<style lang="scss" scoped>
+.loading {
+    display: flex;
+    margin: 20px auto;
+    align-items: center;
+    justify-content: center;
+
+    .label {
+        font-size: 14px;
+        line-height: 22px;
+        color: #999;
+    }
+}
+</style>