Learn to write Domready

Original video Reference http://www.imooc.com/learn/488

--a blogger who tries to learn to write--

/** * Created by Ty on 2016/1/3.*///try to write the Domready function yourselffunctionMyready (FN) {/*FN is a function that executes after ready*/    if(Document.addeventlistener) {Document.addeventlistener ("Domcontentloaded", FN,false); }Else{iedomready (FN); }    /*IE analog domcontentloaded*/    functionIedomready (FN) {varD =window.document; varDone =false; //executes only 1 user callback functions init ();        functioninit () {if(!Done ) { Done=true;            FN ();        }        }; (function(){            Try {                //The DOM tree will throw an error before calling DoScroll for creation to completeD.documentelement.doscroll ("left"); }Catch(e) {//delay and try again               //Arguments.callee is calling itselfSetTimeout (arguments.callee,50); return; }            //no error means that the DOM tree is created and then immediately executes the user callbackinit ();        })(); //Monitor the loading status of the documentD.onreadystatechange =function(){            //If the user is a function that is bound after Domready, immediately executes the            if(D.readystate = = "complete") {D.onreadystatechange=NULL;            Init (); }        }    }}

Learn to write Domready