refactor(core): add render

src/core/util/dom.js

@@ -0,0 +1,41 @@
+import { isFn } from '../util/core'
+
+const cacheNode = {}
+
+/**
+ * Get Node
+ * @param  {String|Element} el
+ * @param  {Boolean} noCache
+ * @return {Element}
+ */
+export function getNode (el, noCache = false) {
+  if (typeof el === 'string') {
+    el = noCache ? dom.find(el) : (cacheNode[el] || dom.find(el))
+  }
+
+  return el
+}
+
+export const dom = {
+  body: document.body,
+  head: document.head,
+  find: node => document.querySelector(node),
+  findAll: node => document.querySelectorAll(node),
+  create: (node, tpl) => {
+    node = document.createElement(node)
+    if (tpl) node.innerHTML = tpl
+  },
+  appendTo: (target, el) => target.appendChild(el)
+}
+
+export function on (el, type, handler) {
+  isFn(type)
+    ? window.addEventListener(el, type)
+    : el.addEventListener(type, handler)
+}
+
+export const off = function on (el, type, handler) {
+  isFn(type)
+    ? window.removeEventListener(el, type)
+    : el.removeEventListener(type, handler)
+}