修改事件方法为现代语法

src/utils.js

@@ -6,18 +6,16 @@
 
 function noop() {}
 
-export function $(selector, container) {
+export function $(selector, container, multi) {
+  let fn = multi ? 'querySelectorAll' : 'querySelector'
   if (container) {
-    return container.querySelector(selector)
+    return container[fn](selector)
   }
-  return document.body.querySelector(selector)
+  return document.body[fn](selector)
 }
 
 export function $$(selector, container) {
-  if (container) {
-    return container.querySelectorAll(selector)
-  }
-  return document.body.querySelectorAll(selector)
+  return $(selector, container, true)
 }
 
 export const nextTick = (function () {
@@ -192,8 +190,7 @@ export function clearOutsideClick(fn = noop) {
  * @param stop <Boolean> 是否禁止事件冒泡
  */
 export function fire(el, name = 'click', data = {}, stop) {
-  let ev = document.createEvent('Events')
-  ev.initEvent(name, !stop, true)
+  let ev = new Event(name, { bubbles: !stop, cancelable: true })
   Object.assign(ev, data)
   el.dispatchEvent(ev)
 }