Recycle list add api (#417)

* docs(recycle-list): add clean methods

* feat(recycle-list): add clean methods

* test(recycle-list): test clean methods

* docs(recycle-list): change clean to reset

* feat(recycle-list): change clean method to reset method

* test(recycle-list): test list length of recycle-list

* test(recycle-list): optimize unit case

document/components/docs/en-US/recycle-list.md

@@ -144,3 +144,9 @@ The `onFetch` function must return a Promise, and the first argument to Promise'
 | item | Scope slot for each data item | data: An item in items |
 | spinner | Named slot for loading more | - |
 | noMore | Named slot for no more data | - |
+
+### Instance methods
+
+| Method name | Description |
+| - | - |
+| reset | To clean up all the contents |

document/components/docs/zh-CN/recycle-list.md

@@ -144,3 +144,9 @@
 | item | 列表某项的作用域插槽，通过此插槽实现想要的渲染视图 | data: 调用方传入的数据项集合的某一项 |
 | spinner | 加载更多的提示文案的具名插槽 | - |
 | noMore | 无更多数据的提示文案的具名插槽 | - |
+
+### 实例方法
+
+| 方法名 | 说明 |
+| - | - |
+| reset | 清空列表全部内容，重置数据 |

src/components/recycle-list/recycle-list.vue

@@ -263,6 +263,43 @@
           }
         }
       },
+      reset () {
+        const map = [
+          {
+            key: 'items',
+            value: []
+          },
+          {
+            key: 'heights',
+            value: 0
+          },
+          {
+            key: 'startIndex',
+            value: 0
+          },
+          {
+            key: 'loadings',
+            value: []
+          },
+          {
+            key: 'noMore',
+            value: false
+          },
+          {
+            key: 'list',
+            value: []
+          },
+          {
+            key: 'promiseStack',
+            value: []
+          }
+        ]
+        map.forEach(({ key, value }) => {
+          this[key] = value
+        })
+        this.$el.scrollTop = 0
+        this.load()
+      },
       _onScroll() {
         // trigger load
         if (!this.noMore && this.$el.scrollTop + this.$el.offsetHeight > this.heights - this.offset) {

test/unit/specs/recycle-list.spec.js

@@ -47,6 +47,21 @@ describe('RecycleList', () => {
       }, 500)
     }, 500)
   })
+  it('should clean all contents', (done) => {
+    vm = createRecycleList(true)
+    setTimeout(() => {
+      vm.$parent.reset()
+      vm.reset()
+
+      expect(vm.list.length)
+        .to.equal(0)
+      setTimeout(() => {
+        expect(vm.list.length)
+          .to.equal(10)
+        done()
+      }, 500)
+    }, 500)
+  })
   it('should call correct method', (done) => {
     vm = createRecycleList()
     setTimeout(() => {
@@ -82,6 +97,9 @@ function createRecycleList (infinite) {
       }
     },
     methods: {
+      reset () {
+        this.pid = 0
+      },
       onFetch () {
         let items = []
         this.pid += 1