完成全部功能，优化图表和对话

client/src/App.vue

@@ -6,7 +6,7 @@ import * as echarts from 'echarts'
 import {CategoryScale, Chart, LinearScale, LineController, LineElement, PointElement, Title,} from 'chart.js'
 import 'chartjs-adapter-moment'
 import mermaid from 'mermaid'
-import {each, isEqual, isJson, nextTick} from 'licia'
+import {each, isEqual, isNull, nextTick} from 'licia'
 
 Chart.register(
   LineController,
@@ -35,14 +35,19 @@ md.use(function (md) {
     const content = tokens[idx].content
     // 此处判断是否为 echarts 代码块
     if (tokens[idx].info === 'echarts') {
-      if (isJson(content)) {
-        chartsMap.value.echarts[idx] = JSON.parse(content) //此处表示将内容存起来，存到当前页面的变量去
+      try {
+        chartsMap.value.echarts[idx] = JSON.parse(content)
+        console.log('ok', content)
+      } catch (e) {
+        console.error(e, content)
       }
       return `<div id="echarts-${idx}" style="width: 600px;height:400px;"></div>`
     } else if (tokens[idx].info === 'chartjs') {
       // 此处判断是否为 chartjs 代码块
-      if (isJson(content)) {
+      try {
         chartsMap.value.chartjs[idx] = JSON.parse(content)
+      } catch (e) {
+        console.error(e, content)
       }
       return `<canvas id="chartjs-${idx}"></canvas>`
     } else if (tokens[idx].info === 'mermaid') {
@@ -97,6 +102,7 @@ const handleSubmit = async () => {
     mermaid: {},
   }
 
+  let eventSource
   try {
     const url = 'http://localhost:7891/chat/stream'
     const formData = new FormData()
@@ -112,7 +118,7 @@ const handleSubmit = async () => {
       formData.append('database_name', databaseName.value)
     }
 
-    const eventSource = createEventSource({
+    eventSource = createEventSource({
       url: url,
       method: 'POST',
       body: formData,
@@ -131,6 +137,9 @@ const handleSubmit = async () => {
     answer.value = '抱歉，请求出现错误'
     renderedAnswer.value = answer.value
     showToastMessage('请求失败，请检查服务器连接', 'error')
+    if (!isNull(eventSource)) {
+      eventSource.close()
+    }
   } finally {
     loading.value = false
   }
@@ -224,7 +233,7 @@ onMounted(() => {
 <template>
   <div class="chat-container">
     <div class="chat-header">
-      <h1>数据库助手</h1>
+      <h1>知识库助手</h1>
     </div>
 
     <div class="messages-container">