SharepointL Root Site URL

SharepointRootSIteURL.js

//HOW TO GET SITE URL 
document.location.origin + _spPageContextInfo.webServerRelativeUrl 
//CODE TO GET SITE DOMAIN SITE URL AND SITE RELATIVE URL 
//GETTING SITE URL 
ExecuteOrDelayUntilScriptLoaded(getWebProperties, "sp.js");
function getWebProperties() { 
  var ctx = new SP.ClientContext.get_current();
  this.web = ctx.get_web();
  ctx.load(this.web, 'Title', 'Id', 'Created', 'ServerRelativeUrl');
  ctx.executeQueryAsync(Function.createDelegate(this, this.onSuccess), Function.createDelegate(this, this.onFail));  
  
} function onSuccess(sender, args) {
  _relativeUrl = this.web.get_serverRelativeUrl();  
  _fullSiteUrl = document.location.origin + _relativeUrl; 
  
} function onFail(sender, args) {  
  console.log('failed to get list. Error:' + args.get_message()); 
  
}
//EO: Getting SITE URL