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src/views/homePage/Echarts/index.vue

@@ -71,10 +71,12 @@ export default {
         tooltip: {
           trigger: "axis",
           formatter: function (params) {
-            var relVal = params[0].name;
+            var relVal = params[0].name + "<br/>"; // 假设 params[0].name 是标题或类别名
             for (var i = 0; i < params.length; i++) {
-              relVal +=
+              // 检查值是否为 undefined，如果是，则替换为 --
-                "<br/>" + params[i].seriesName + " : " + params[i].value;
+              var value =
+                params[i].value !== undefined ? params[i].value : "--";
+              relVal += params[i].seriesName + " : " + value + "<br/>";
             }
             return relVal;
           },