add input step prop

examples/docs/en-US/input.md

@@ -609,8 +609,9 @@ Search data from server-side.
 |auto-complete | same as `auto-complete` in native input | string | on/off | off |
 |name | same as `name` in native input | string | — | — |
 | readonly | same as `readonly` in native input | boolean | — | false |
-|max | same as `max` in native input | * | — | — |
+|max | same as `max` in native input | — | — | — |
-|min | same as `min` in native input | * | — | — |
+|min | same as `min` in native input | — | — | — |
+|step| same as `step` in native input | — | — | — |
 |resize| control the resizability | string | none, both, horizontal, vertical | — |
 |autofocus | same as `autofocus` in native input | boolean | — | false |
 |form | same as `form` in native input | string | — | — |

examples/docs/zh-CN/input.md

@@ -771,8 +771,9 @@ export default {
 | auto-complete | 原生属性，自动补全 | string | on, off | off |
 | name | 原生属性 | string | — | — |
 | readonly | 原生属性，是否只读 | boolean | — | false |
-| max | 原生属性，设置最大值 | * | — | — |
+| max | 原生属性，设置最大值 | — | — | — |
-| min | 原生属性，设置最小值 | * | — | — |
+| min | 原生属性，设置最小值 | — | — | — |
+| step | 原生属性，设置输入字段的合法数字间隔 | — | — | — |
 | resize | 控制是否能被用户缩放 | string | none, both, horizontal, vertical | — |
 | autofocus | 原生属性，自动获取焦点 | boolean | true, false | false |
 | form | 原生属性 | string | — | — |

packages/input/src/input.vue

@@ -39,6 +39,7 @@
         :autofocus="autofocus"
         :min="min"
         :max="max"
+        :step="step"
         :form="form"
         :value="currentValue"
         ref="input"
@@ -123,6 +124,7 @@
       minlength: Number,
       max: {},
       min: {},
+      step: {},
       validateEvent: {
         type: Boolean,
         default: true