Javascript草稿纸

利用firefox草稿纸,往空白的页面加入JQuery类库:

var urls = {
  jQuery: 'http://cdn.bootcss.com/jquery/2.1.3/jquery.js'
};

(function (urls) {
  function loadExternalScript(urls) {
    if (typeof urls !== 'object') {
      throw new Error('The parameters should be a pure object');
    }
    var body = document.getElementsByTagName('body') [0],
    k;
    if (body) {
      for (k in urls) {
        var script = document.createElement('script');
        script.src = urls[k];
        script.id = k;
        if (!document.getElementById(k)) {
          if (body.parentNode) {
            body.parentNode.insertBefore(script, body.nextSibling);
          }
        }
      }
    }
  }
  loadExternalScript(urls);
}(urls));

var text = 'aa';
(function(text){
  console.log($.each);
}(text));

var a = function() {
  console.log("a");
};

var b = function() {
  a();
};

var b = (function(text){
 return "bbb";
}(text));

var c = "";
$.ajax({
  success: function(data) {
    d();
    c = data;
  }
});

var d = function() {
  console.log(c);
};