LoadScript

function loadScripts(urls, callback) {
  if (typeof (urls) === "string"){
    urls = [urls];
  }
  var returnCallback = function (url) {
    returnCallback.Counter++;
    if (returnCallback.Counter >= urls.length){
      callback();
    }
  }
  returnCallback.Counter = 0;
  var oHead = document.getElementsByTagName("head")[0];
  for (var i = 0; i < urls.length; i++){
    loadScript(urls[i], returnCallback,oHead);
  }
} function loadScript(url, callback,oHead) {
  var script = document.createElement("script")
  script.type = "text/javascript";
  script.src = url;
//IE6-8
  if (script.readyState) {
    script.onreadystatechange = function () {
      if (script.readyState == "loaded" || script.readyState == "complete") {
        script.onreadystatechange = null;
        callback(url);
      }
    };
  }
//ie9+,chrome,ff
  else {
    script.onload = function () {
      callback(url);
    };
  }
  oHead = oHead || document.getElementsByTagName("head")[0];
  oHead.insertBefore( script, oHead.firstChild );
}

  

参考:http://www.cnblogs.com/aarond/category/504617.html

   http://www.cnblogs.com/sntetwt/p/4075154.html 

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