feat: able to approximate token (close #207)

web/src/components/OperationSetting.js

@@ -18,7 +18,8 @@ const OperationSetting = () => {
     ChannelDisableThreshold: 0,
     LogConsumeEnabled: '',
     DisplayInCurrencyEnabled: '',
-    DisplayTokenStatEnabled: ''
+    DisplayTokenStatEnabled: '',
+    ApproximateTokenEnabled: '',
   });
   const [originInputs, setOriginInputs] = useState({});
   let [loading, setLoading] = useState(false);
@@ -181,6 +182,12 @@ const OperationSetting = () => {
               name='DisplayTokenStatEnabled'
               onChange={handleInputChange}
             />
+            <Form.Checkbox
+              checked={inputs.ApproximateTokenEnabled === 'true'}
+              label='使用近似的方式估算 token 数以减少计算量'
+              name='ApproximateTokenEnabled'
+              onChange={handleInputChange}
+            />
           </Form.Group>
           <Form.Button onClick={() => {
             submitConfig('general').then();