chore(*): remove document-ready

Author: QingWei-Li

package.json

@@ -30,7 +30,6 @@
     "pub": "sh build/release.sh"
   },
   "dependencies": {
-    "document-ready": "^2.0.1",
     "marked": "^0.3.6",
     "prismjs": "^1.6.0",
     "tinydate": "^1.0.0",

src/core/index.js

@@ -1,11 +1,23 @@
-import ready from 'document-ready'
 import { initMixin } from './init'
 import { routerMixin } from './router'
 import { renderMixin } from './render'
 import { fetchMixin } from './fetch'
 import { eventMixin } from './event'
 import initGlobalAPI from './global-api'
 
+/**
+ * Fork https://github.com/bendrucker/document-ready/blob/master/index.js
+ */
+function ready (callback) {
+  const state = document.readyState
+
+  if (state === 'complete' || state === 'interactive') {
+    return setTimeout(callback, 0)
+  }
+
+  document.addEventListener('DOMContentLoaded', callback)
+}
+
 function Docsify () {
   this._init()
 }