fix: 修复“存证页面筛选条件选择未上链。然后随意查看一个后返回，筛选条件被重置了”的bug

src/views/proof/Index.vue

@@ -49,6 +49,7 @@
     >
       <van-picker
         show-toolbar
+        :default-index="getDefaultChainFilterIndex"
         :columns="columns"
         @cancel="showFilterPicker = false"
         @confirm="onConfirmFilter"
@@ -226,7 +227,23 @@ export default class Index extends Mixins(MixinProof) {
     }
   }
 
+  private initFilter() {
+    const filter = window.sessionStorage.getItem('chainStatusFilter');
+    if (filter !== null) {
+      this.chainStatus = JSON.parse(filter);
+    }
+  }
+
+  get getDefaultChainFilterIndex() {
+    if (typeof this.chainStatus === 'number') {
+      return this.columns.findIndex((item) => item.status === this.chainStatus);
+    } else {
+      return 0;
+    }
+  }
+
   private mounted() {
+    this.initFilter();
     // 检查是否需要弹出 添加存证 弹出框，若是，则并且准备弹出
     this.checkIfAddProofVisibleAndExe();
     Object.keys(ChainStatusStr).forEach((key: string) => {
@@ -259,6 +276,10 @@ export default class Index extends Mixins(MixinProof) {
   }
   private onConfirmFilter(value: any) {
     this.chainStatus = value.status;
+    window.sessionStorage.setItem(
+      'chainStatusFilter',
+      JSON.stringify(value.status)
+    );
     this.resetList();
     this.showFilterPicker = false;
   }