feat(picker): move 防抖

Author: NewFuture

miniprogram_dist/index.js

@@ -1,4 +1,5 @@
 import { array_move } from 'polyfill.js';
+import { throttle } from './polyfill';
 /**
  * 临时数据缓存
  */
@@ -82,6 +83,10 @@ Component({
         return { value: this._getCache().imgs }
     },
 
+    created(){
+        this.onChange = throttle(this.onChange);
+    },
+
     /**
      * 初始化缓存
      * 渲染全部图标

miniprogram_dist/polyfill.js

@@ -21,3 +21,19 @@ export function array_move(arr, oldIndex, newIndex) {
     arr.splice(newIndex, 0, arr.splice(oldIndex, 1)[0]);
     return arr;
 };
+
+/**
+ * 事件节流(防抖)
+ * @param {Function} func 事件 
+ * @param {number} wait 等待时间ms 
+ */
+export function throttle(func, wait) {
+    if (!wait) { wait = 300; }
+    var last = -wait;
+    return function (event) {
+        if (event.timeStamp - last > wait) {
+            func.apply(this, arguments);
+            last = event.timeStamp;
+        }
+    };
+}