docs: 添加注释

Former-commit-id: b726f6e74c670f8f819684f62dfe20f4fbe752a3

src/views/dashboard/components/BarChart.vue

@@ -132,11 +132,13 @@ const options = {
 };
 
 onMounted(() => {
+  // 图表初始化
   const chart = echarts.init(
     document.getElementById(props.id) as HTMLDivElement
   );
   chart.setOption(options);
 
+  // 大小自适应
   window.addEventListener('resize', () => {
     chart.resize();
   });