fix: Fixed when a TextArea with maxLength is input in Chinese, clicki… (#2019)

* fix: Fixed when a TextArea with maxLength is input in Chinese, clicking outside triggers blur, and the echoed content does not comply with the maxLength setting

* fix: fix jest test error

packages/semi-foundation/input/textareaFoundation.ts

@@ -113,15 +113,21 @@ export default class TextAreaFoundation extends BaseFoundation<TextAreaAdapter>
      */
     handleVisibleMaxLength(value: string) {
         const { maxLength, getValueLength } = this._adapter.getProps();
-        if (isNumber(maxLength) && maxLength >= 0 && isFunction(getValueLength) && isString(value)) {
-            const valueLength = getValueLength(value);
-            if (valueLength > maxLength) {
-                console.warn('[Semi TextArea] The input character is truncated because the input length exceeds the maximum length limit');
-                const truncatedValue = this.handleTruncateValue(value, maxLength);
-                return truncatedValue;
+        if (isNumber(maxLength) && maxLength >= 0 && isString(value)) {
+            if (isFunction(getValueLength)) {
+                const valueLength = getValueLength(value);
+                if (valueLength > maxLength) {
+                    console.warn('[Semi TextArea] The input character is truncated because the input length exceeds the maximum length limit');
+                    const truncatedValue = this.handleTruncateValue(value, maxLength);
+                    return truncatedValue;
+                }
             } else {
-                return value;
+                if (value.length > maxLength) {
+                    console.warn('[Semi TextArea] The input character is truncated because the input length exceeds the maximum length limit');
+                    return value.slice(0, maxLength);
+                }
             }
+            return value;
         }
         return undefined;
     }
@@ -158,8 +164,26 @@ export default class TextAreaFoundation extends BaseFoundation<TextAreaAdapter>
 
     handleBlur(e: any) {
         const { value } = this.getStates();
+        const { maxLength } = this.getProps();
+        let realValue = value;
+        if (maxLength) {
+            // 如果设置了 maxLength，在中文输输入过程中，如果点击外部触发 blur，则拼音字符的所有内容会回显，
+            // 该表现不符合 maxLength 规定，因此需要在 blur 的时候二次确认
+            // 详情见 https://github.com/DouyinFE/semi-design/issues/2005
+            // If maxLength is set, during the Chinese input process, if you click outside to trigger blur, 
+            // all the contents of the Pinyin characters will be echoed.
+            // This behavior does not meet the maxLength requirement, so we need to confirm twice when blurring。
+            // For details, see https://github.com/DouyinFE/semi-design/issues/2005
+            realValue = this.handleVisibleMaxLength(value);
+            if (realValue !== value) {
+                if (!this._isControlledComponent()) {
+                    this._adapter.setValue(realValue);
+                }
+                this._adapter.notifyChange(realValue, e);
+            }
+        }
         this._adapter.toggleFocusing(false);
-        this._adapter.notifyBlur(value, e);
+        this._adapter.notifyBlur(realValue, e);
     }
 
     handleKeyDown(e: any) {