bug修改

src/pages/system/library/books/detail.vue

           <el-input v-model="formData.BookBarcode" :style="{ width: '200px' }" :disabled="true"></el-input>
         </el-form-item>
         <el-form-item label="案场" prop="CaseId">
-          <el-select v-model="formData.CaseId" placeholder="请选择案场" :disabled="detail.BookId?true:false" @change="filterTypes">
+          <el-select v-model="caseid" placeholder="请选择案场" :disabled="detail.BookId?true:false" @change="filterTypes">
             <el-option
               v-for="item in cases"
               :key="item.CaseId"
       detail: s => s.detail,
       types: s => s.type.list,
     }),
+    caseid: {
+      get () {
+        return this.formData.CaseId || this.defaultCase
+      },
+      set (val) {
+        this.$set(this.formData, 'CaseId', val)
+      }
+    },
   },
   watch: {
     detail: {
     ...mapActions({
       getInfo: 'getBookDetail',
       getTypeList: 'getTypeList',
-      updateDetail: 'updateBookDetail'
+      updateDetail: 'updateBookDetail',
     }),
 
     nextStep() {