fix: 修复取值错误问题 (#4334)

Author: mimaoxiao

packages/pro-components/chat/chat-markdown/chat-markdown-node/chat-markdown-node.wxml

@@ -15,7 +15,7 @@
           <block wx:if="{{li.tokens && li.tokens.length}}">
             <chat-markdown-node nodes="{{li.tokens}}" />
           </block>
-          <block wx:else>{{''+item.text+''}}</block>
+          <block wx:else>{{''+li.text+''}}</block>
         </view>
       </block>
     </view>

packages/uniapp-pro-components/chat/chat-markdown-node/chat-markdown-node.vue

@@ -29,7 +29,7 @@
                 <TChatMarkdownNode :nodes="li.tokens" />
               </block>
               <block v-else>
-                {{ item.text }}
+                {{ li.text }}
               </block>
             </view>
           </block>