JavaScript OnLoad Event without jQuery

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• Firefox IE7 onload event question

  function onLoad() {
      console.log("onLoad");
  }
  
  function onUnload() {
      console.log("onUnload");
  }
  
  if (window.attachEvent) {
      window.attachEvent("onload", onLoad);
      window.attachEvent("onunload", onUnload);
  } else {
      window.addEventListener("DOMContentLoaded", onLoad, false);
      window.addEventListener("unload", onUnload, false);
  }