Info

http://stackoverflow.com/q/8380204/918414

Preparation code

<script>
var injectScript = (function() {
  var w3c;
  var doc = document;
  var docEl = doc.documentElement;
  try {
    w3c = !!doc.createElement('script').appendChild(doc.createTextNode(''));
  } catch(e) { }

  return function(text) {
    var script = doc.createElement('script');
    if (w3c) {
      script.appendChild(doc.createTextNode(text));
    } else {
      script.text = text;
    }
    docEl.removeChild(docEl.insertBefore(script, docEl.firstChild));
  };
}());
</script>

Test runner

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window.eval( 'var x = 1;' );

injectScript( 'var x = 1;' );

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