first add files

ProjectLiaisonForm/pages/textarea/maxcharacter/index.js

@@ -0,0 +1 @@
+Component({});

ProjectLiaisonForm/pages/textarea/maxcharacter/index.json

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+{
+  "component": true,
+  "usingComponents": {
+    "t-textarea": "tdesign-miniprogram/textarea/textarea"
+  }
+}

ProjectLiaisonForm/pages/textarea/maxcharacter/index.wxml

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+<t-textarea
+  t-class="external-class"
+  label="标签文字"
+  placeholder="设置最大字符个数，一个汉字表示两个字符"
+  maxcharacter="200"
+  disableDefaultPadding="{{true}}"
+  indicator
+/>

ProjectLiaisonForm/pages/textarea/maxcharacter/index.wxss

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+.external-class {
+  height: 324rpx;
+}