js loader

loadJS.js

BLS.unitTests.loadJS = function(strJS, cb) {
    var objHead  	= document.getElementsByTagName('head')[0]
    	, oEmbed	= document.createElement('script')
      ;

    oEmbed.type = 'text/javascript';
    oEmbed.src = strJS;
    oEmbed.async = false; // force to load in order

    // listener for when file is done loading
    oEmbed.onload = oEmbed.onreadystatechange = function() {
      var rs = this.readyState;
      if ( rs && rs !== 'complete' && rs !== 'loaded' ) return;

      // debug
      console.log('finished loading ' + strJS);

      // oncomplete, fire cb 
      if( cb ) cb();

      // avoid memory leak
      oEmbed.onload = oEmbed.onreadystatechange = null;
    }

    objHead.appendChild(oEmbed); // inject into DOM

    return this;
};