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Simple Wait For Document Helper

A Simple helper library for wait document load

此脚本不应直接安装。它是供其他脚本使用的外部库，要使用该库请加入元指令 // @require https://update.cn-greasyfork.org/scripts/373524/639009/Simple%20Wait%20For%20Document%20Helper.js 

  1. /**
  2.  * Simple Wait For Document Helper
  3.  * by Jixun<https://jixun.moe/>
  4.  */
  5. var waitForDocument = (function () {
  6.   var callbackQueue = []
  7.   var ready = false
  8.  
  9.   function waitForDocument(callback) {
  10.     if (ready) {
  11.       requestAnimationFrame(callback)
  12.       return
  13.     }
  14.  
  15.     callbackQueue.push(callback)
  16.   }
  17.  
  18.   function triggerCallbackQueue() {
  19.     if (ready === true) {
  20.       // Already processed
  21.       return
  22.     }
  23.  
  24.     ready = true
  25.  
  26.     // process callback queue
  27.     callbackQueue.forEach(requestAnimationFrame)
  28.     callbackQueue = null
  29.  
  30.     // remove those listeners
  31.     document.removeEventListener('DOMContentLoaded', triggerCallbackQueue)
  32.     document.removeEventListener('load', triggerCallbackQueue)
  33.   }
  34.  
  35.   // listen for document loaded events
  36.   document.addEventListener('DOMContentLoaded', triggerCallbackQueue)
  37.   document.addEventListener('load', triggerCallbackQueue)
  38.  
  39.   // check if document is ready yet
  40.   if (['interactive', 'complete'].indexOf(document.readyState) !== -1) {
  41.     triggerCallbackQueue()
  42.   }
  43.  
  44.   return waitForDocument
  45. })()