趋势图调整了图例距离上下的距离，增加了配置项

@@ -679,6 +679,14 @@ export const monitorCustomBarLineChart = {
               value: 'top'
             },
             {
+              type: 'el-input-number',
+              label: '距离顶部/底部距离',
+              name: 'legendHeight',
+              required: false,
+              placeholder: '',
+              value: 30,
+            },
+            {
               type: 'el-select',
               label: '布局前置',
               name: 'layoutFront',

@@ -456,9 +456,9 @@ export default {
       const legend = this.options.legend;
       legend.show = optionsSetup.isShowLegend;
       legend.left = optionsSetup.lateralPosition;
-      legend.top = optionsSetup.longitudinalPosition == "top" ? 20 : "auto";
+      legend.top = optionsSetup.longitudinalPosition == "top" ? optionsSetup.legendHeight : "auto";
       legend.bottom =
-        optionsSetup.longitudinalPosition == "bottom" ? 0 : "auto";
+        optionsSetup.longitudinalPosition == "bottom" ? optionsSetup.legendHeight : "auto";
       legend.orient = optionsSetup.layoutFront;
       legend.textStyle = {
         color: optionsSetup.lengedColor,