/*
использование
imports([
    "/js/src/supports/supports_html5.js"
    ],
    function (){
        alert('test');
    },
    function (err){
        alert(err);
    });
*/

//код
var registrImport = {};

registrImport["/js/kernel/importer/importer.js"] = 0;

(function(){
    registrImportUpdate("/js/kernel/package/package.js");
    var script = document.createElement('script');
    script.src = "/js/kernel/package/package.js";
    script.async = false;
    script.defer = true;
    document.head.appendChild(script);
    script.onerror = function() {
      alert("Ошибка при загрузке системного пакета package.js");
    };
});

function imports(arr, onSuccess, onError){
    var count = arrCount(arr);
  var coutLoad = 0;

  arr.forEach(function(item) {
    coutLoad++;

        if (registrImport[item] == undefined){
         loadScript(item, onSuccess, onError, count, coutLoad);
      } else {
         console.info(item + "  загружен ранее.");
      }
  });
}

function arrCount(arr){
  var count = 0;
  arr.forEach(function(){
    count++;
  });
  return count;
}

function loadScript(url, onSuccess, onError, count, coutLoad){
    registrImportUpdate(url);

    var script = document.createElement('script');
    script.src = url;
    script.async = false;
    script.defer = true;
    document.head.appendChild(script);

    script.onerror = function() {
      onError(url);
    };

    script.onload = function() {
      if(count == coutLoad){
        onSuccess();
      }
    };
}

function registrImportUpdate(url){
  registrImport[url] = 0;
}