feat: add IInput.vue component; 🌟

新增：IInput.vue 组件；

src/components/input/IInput.vue

@@ -0,0 +1,66 @@
+<template>
+  <a-input
+    :addon-after="addonAfter"
+    :addon-before="addonBefore"
+    :default-value="defaultValue"
+    :disabled="disabled"
+    :id="id"
+    :max-length="maxLength"
+    :prefix="prefix"
+    :size="size"
+    :suffix="suffix || lenSuffix"
+    :type="type"
+    :allow-clear="allowClear"
+    v-model="sValue"
+    :value="value"
+    @change="onChange"
+    @input="onInput"
+    @pressEnter="onPressEnter"
+    @keydown="onKeydown"
+  >
+    <template :slot="slot" v-for="slot in Object.keys($slots)">
+      <slot :name="slot"></slot>
+    </template>
+  </a-input>
+</template>
+
+<script>
+  export default {
+    name: 'IInput',
+    model: {
+      prop: 'value',
+      event: 'change.value'
+    },
+    props: ['addonAfter', 'addonBefore', 'defaultValue', 'disabled', 'id', 'maxLength', 'prefix', 'size', 'suffix', 'type', 'value', 'allowClear'],
+    data() {
+      return {
+        sValue: this.value || this.defaultValue || ''
+      }
+    },
+    watch: {
+      value(val) {
+        this.sValue = val
+      }
+    },
+    computed: {
+      lenSuffix() {
+        return this.maxLength && `${(this.sValue + '').length}/${this.maxLength}`
+      }
+    },
+    methods: {
+      onChange(e) {
+        this.$emit('change', e)
+        this.$emit('change.value', e.target.value)
+      },
+      onInput(e) {
+        this.$emit('input', e)
+      },
+      onPressEnter(e) {
+        this.$emit('pressEnter', e)
+      },
+      onKeydown(e) {
+        this.$emit('keydown', e)
+      }
+    }
+  }
+</script>