GetScript: Inject external script to a document

gs.js

/*
you'll need to include supporting script like: w,d,dm,i{},ti,to,wc
they are shortcuts for: window,document,DomJs,VariableTest,Timer,and console.
*/

var
gs=function(a){
	
	if(!io(a)||!is(a.src)){we(': Invalid source: '+a.src);return}
	
	var
	b=a.callback,
	v=a.valid,
	ss='script',
	sl='loaded';
	
	if(im(b)&&r(v)){b(sl);return}
	
	var
	o={src:a.src},
	s=dm.create(ss),
	fa=function(v){
		if(ib(a[v])||is(a[v])){o[v]=a[v]}
	},
	dn=!1,
	fn,
	ho,
	hi,
	x,
	h=a.handle||d.scripts[0];
	
	if(im(b)&&im(v)){
		fn=function(){
			if(dn){return}
			dn=!0;
			ti0(hi);
			to0(ho);
			b(v()?sl:'timeout');
		};
		ho=to1(fn,n(a.timeout,10000));
		hi=ti1(function(){if(v()){fn();}},n(a.interval,1000));
		if('readyState'in s){
			s.onreadystatechange=function(){
				if([sl,"complete"].indexOf(s.readyState)){
					s.onreadystatechange=null;
					fn();
				}
			};
		}else{
			s.onload=fn;
		}
	}
	
	if(is(a.type)){o.type=a.type}
	fa('defer');
	fa('async');
	for(x in o){dm.attr(s,x,o[x])}
	dm.insertBefore(s,h);
};

// Usage Example
  var
  w=window,
  ready=function(){
  },
  h=d.currentScript||d.scripts[0],
	$v='3.2.1',
	js='text/javascript',
	sl='loaded',
	cg=0
	?'https://ajax.googleapis.com/ajax/libs/'
	:'http://127.0.0.1:8887/';
		gs({
			src:cg+'jquery/'+$v+'/jquery.min.js',
			type:js,
			handle:h,
			valid:function(){
				return w.$ && w.$.fn && w.$.fn.jquery==$v
			},
			callback:function(s){
				if(s!=sl){wt('JQ '+s);return}
				$(ready);
			}
		});