platform模块分析

包含一堆全局的公用方法(例如runOnWindowLoad)和js api的扩展(例如promise和map的扩展), 无外部依赖 ,按理来说他应该叫util

/front_end/platform/utilities.js
function runOnWindowLoad(callback) {
  /**
   * @suppressGlobalPropertiesCheck
   */
  function windowLoaded() {
    self.removeEventListener('DOMContentLoaded', windowLoaded, false);
    callback();
  }

  if (document.readyState === 'complete' || document.readyState === 'interactive')
    callback();
  else
    self.addEventListener('DOMContentLoaded', windowLoaded, false);
}

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