fix:修改BUG

dashboard模块
1.panel列表页面表格和曲线及对应全屏的loading的统一及加载时样式调整
2.全屏查询条件及数据更新时，不再与列表的数据和查询时间进行统一
说明：预览模块的预览及全屏的loading及数据同步等还需要调整

nezha-fronted/src/components/common/loading.vue

@@ -0,0 +1,37 @@
+<style scoped lang="scss">
+  .loading-font{
+    color:#232f3e !important;
+  }
+</style>
+<template>
+  <div v-show="showLoading" class="el-loading-mask" style="background-color: rgba(0, 0, 0, 0);">
+    <div class="el-loading-spinner">
+      <img width="42px" height="42px"  src="../../assets/img/loading.gif"/>
+      <p class="el-loading-text loading-font">loading</p>
+    </div>
+  </div>
+</template>
+
+<script>
+export default {
+  name: "loading",
+  props: {
+
+  },
+  data() {
+    return {
+      showLoading:false,
+    };
+  },
+  methods: {
+    startLoading(){
+      this.showLoading = true;
+    },
+    endLoading(){
+      this.showLoading = false;
+    },
+  }
+};
+</script>
+
+