更新图片验证输入问题

src/components/m-img-code/index.tsx

@@ -31,7 +31,6 @@ export default defineComponent({
   },
   emits: ['close', 'sendCode'],
   data() {
-    const origin = window.location.origin;
     return {
       isSuffix: '/edu-app',
       showStatus: false,
@@ -47,9 +46,9 @@ export default defineComponent({
     value(val: any) {
       this.showStatus = val;
     },
-    code(val: any) {
+    async code(val: any) {
       if (val.length >= 4) {
-        this.checkVerifyLoginImage();
+        await this.checkVerifyLoginImage();
       }
     }
   },
@@ -126,6 +125,7 @@ export default defineComponent({
                 v-model={this.code}
                 class={styles.field}
                 autocomplete="off"
+                maxlength={4}
               />
             </Col>
             <Col span="10" class={styles.img}>