fix:修复地图无限滚动的问题 & legend option添加悬浮背景色

nezha-fronted/src/components/charts/chartPreview.vue

@@ -90,7 +90,7 @@
           </template>
           <template v-else>
             <div class="legend-container legend-container-screen" ref="screenLegendArea" @mouseenter="mouseEnterFullChart" @mouseleave="mouseLeaveFullChart" v-show="showLegend" v-scrollBar:legend>
-              <table style="width: 100%">
+              <table style="width: 100%" border="0" cellpadding="0" cellspacing="0">
                 <th style="width: 100%"></th>
                 <template v-for="legendOption in screenLegendOptions">
                   <th v-if="legendOption.value == 'on'" class="option-th legend-option-cell" >