Add stock dividend trend analysis page with chart rendering and data fetching

js/pubfunc.js

@@ -92,7 +92,7 @@ function pickData(data, dateKey, valueKey,fixed=2) {
     return data.map(item => ({
         value: [
             item[dateKey].slice(0, 4) + '-' + item[dateKey].slice(4, 6) + '-' + item[dateKey].slice(6, 8), // 格式化日期 yyyymmdd 转为 yyyy-mm-dd
-            item[valueKey] === null || item[valueKey] === undefined || item[valueKey] === '' ? '' : item[valueKey].toFixed(fixed)
+            item[valueKey] === null || item[valueKey] === undefined || item[valueKey] === '' ? '' : parseFloat(item[valueKey]).toFixed(fixed)
         ]
     }));
 }

js/renderCharts.js

@@ -102,4 +102,5 @@ function doubleLineChart(params){
     if (option && typeof option === "object") {
         myChart.setOption(option, true);
     }
+    return myChart;
 }