fix(input-item): create debounce method dynamically

variables inner debounce will be shared by multiple component instance

components/input-item/index.vue

@@ -324,6 +324,9 @@ export default {
   },
   created() {
     this.inputValue = this.$_formateValue(this.$_subValue(this.value + '')).value
+    this.$_stopEditInput = debounce(function() {
+      this.isInputEditing = false
+    }, 500)
   },
   mounted() {
     this.isVirtualKeyboard &&
@@ -423,9 +426,7 @@ export default {
       this.isInputEditing = true
       this.$_stopEditInput()
     },
-    $_stopEditInput: debounce(function() {
-      this.isInputEditing = false
-    }, 500),
+    $_stopEditInput: noop,
     $_clearInput() {
       this.inputValue = ''
       !this.isTitleLatent && this.focus()