feat：endpoint 全屏 添加比较差值

nezha-fronted/src/components/page/dashboard/overview/chart.vue

@@ -422,6 +422,9 @@ export default {
             str += '<br/>'
           }
           if (alias.indexOf('Previous ') !== -1 && minusFlag) {
+            if (i !== 0) {
+              str += '<div style="border:1px dashed #333;width:100%;margin-top: 5px"></div>'
+            }
             const value = item.data[0] - this.minusTime
             const tData = new Date(value)
             str += [tData.getFullYear(), tData.getMonth() + 1, tData.getDate()].join('-') + ' ' +
@@ -435,6 +438,26 @@ export default {
           str += '<div style="padding-left: 10px;">'
           str += chartDataFormat.getUnit(this.unit).compute(val, null, 2)
           str += '</div>'
+
+          const previousItem = params.find((series) => ('Previous ' + item.seriesName) === series.seriesName)
+          if (previousItem) {
+            str += '<div style="padding-left: 10px;">'
+            let previousval = parseFloat(Number(previousItem.data[1]).toFixed(2))
+            if (previousval === 0) {
+              previousval = Number(item.data[1]).toExponential(2)
+            }
+            let minusVal = 0
+            if (previousval <= val) {
+              minusVal = val - previousval
+              str += '+'
+            } else {
+              minusVal = previousval - val
+              str += '-'
+            }
+
+            str += chartDataFormat.getUnit(this.unit).compute(minusVal, null, 2)
+            str += '</div>'
+          }
           str += '</div>'
         })
         str += '</div>'