modified: static/js/sensor-1.js

static/js/sensor-1.js

@@ -2,62 +2,53 @@ document.addEventListener('DOMContentLoaded', function () {
     var chartContainer = document.getElementById('chart-container');
     var myChart = echarts.init(chartContainer);
 
-    var timestamps = [];
-    var temperatures = [];
+    var timestamps = [], temperatures = [];
 
-    function fetchAndUpdateData() {
+    function fetchInitialData() {
         fetch('http://111.230.197.156:8000/get_sensor_data')
             .then(response => response.json())
             .then(data => {
-                timestamps = data.timestamps.slice(-200); // 只保留最新的200个数据
-                temperatures = data.temperatures.slice(-200); // 只保留最新的200个数据
+                timestamps = data.timestamps.slice(-200); // 只保留最新的200个时间戳
+                temperatures = data.temperatures.slice(-200); // 只保留最新的200个温度数据
 
+                updateChart();
+            });
+    }
+
+    function fetchLatestData() {
+        fetch('http://111.230.197.156:8000/get_latest_data')
+            .then(response => response.json())
+            .then(data => {
+                // 如果已有200个数据则移除最旧的一条
+                if (timestamps.length >= 200) {
+                    timestamps.shift();
+                    temperatures.shift();
+                }
+
+                // 添加新的数据
+                timestamps.push(data.timestamp);
+                temperatures.push(data.temperature);
+
+                updateChart();
+            });
+    }
+
+    function updateChart() {
         var option = {
-                    title: {
-                        text: '温度数据',
-                        textStyle: {
-                            color: 'white'
-                        }
-                    },
-                    tooltip: {
-                        trigger: 'axis'
-                    },
-                    legend: {
-                        data: ['温度'],
-                        textStyle: {
-                            color: 'white'
-                        }
-                    },
-                    xAxis: {
-                        type: 'category',
-                        data: timestamps,
-                        axisLabel: {
-                            color: 'white'
-                        }
-                    },
-                    yAxis: {
-                        type: 'value',
-                        axisLabel: {
-                            color: 'white'
-                        }
-                    },
-                    series: [
-                        {
-                            name: '温度',
-                            type: 'line',
-                            data: temperatures
-                        }
-                    ]
+            title: { text: '温度数据', textStyle: { color: 'white' } },
+            tooltip: { trigger: 'axis' },
+            legend: { data: ['温度'], textStyle: { color: 'white' } },
+            xAxis: { type: 'category', data: timestamps, axisLabel: { color: 'white' } },
+            yAxis: { type: 'value', axisLabel: { color: 'white' } },
+            series: [{ name: '温度', type: 'line', data: temperatures }]
         };
-
         myChart.setOption(option);
-
-                // 更新最新的温度
-                document.getElementById('temperature').textContent = `当前温度: ${temperatures.slice(-1)}℃`;
-            });
+        document.getElementById('temperature').textContent = `当前温度: ${temperatures[temperatures.length - 1]}℃`;
     }
 
-    // 每5秒刷新一次数据
-    setInterval(fetchAndUpdateData, 1000);
-    fetchAndUpdateData(); 
+    // 初始化时获取所有数据
+    fetchInitialData();
+
+    // 每5秒获取最新的数据
+    setInterval(fetchLatestData, 5000);
 });