fix(components): [select] Filter duplicate emits of "update options" (#11884)

* fix(components): [select] Filter duplicate emits of "update options"

* perf(components): [select] Code standardization

packages/components/select/src/options.ts

@@ -6,6 +6,18 @@ export default defineComponent({
   name: 'ElOptions',
   emits: ['update-options'],
   setup(_, { slots, emit }) {
+    let cachedOptions: any[] = []
+
+    function isSameOptions(a: any[], b: any[]) {
+      if (a.length !== b.length) return false
+      for (const [index] of a.entries()) {
+        if (a[index] != b[index]) {
+          return false
+        }
+      }
+      return true
+    }
+
     return () => {
       const children = slots.default?.()!
 
@@ -19,7 +31,10 @@ export default defineComponent({
             )
             .map((item: VNode) => item.props?.label)
 
-          emit('update-options', filteredOptions)
+          if (!isSameOptions(filteredOptions, cachedOptions)) {
+            cachedOptions = filteredOptions
+            emit('update-options', filteredOptions)
+          }
         }
       }