Windows phone console

gistfile1.txt

if ( (typeof window.console == 'undefined' || typeof window.console.log != 'function') && !!window.location.href.match(/\?console=true/i) ) {
  var ul = _createTag('ul', false, {
    'line-height': '30px',
    'background-color': '#fff',
    'list-style-type': 'square',
    color: '#000',
    position: 'absolute',
    top: 0,
    right: 0,
    left: 0,
    'z-index': 9999
  });
  ul.appendChild(_createTag('li', {
    innerText: 'Javascript Console'
  }, {
    'font-weight': 'bold',
    display: 'block'
  }));
  window.console = {
    log: function(logStr) {
      ul.appendChild(_createTag('li', {
        innerText: logStr.toString()
      }));

    }
  };
  function _createTag(nodeType, attributes, style) {
    var elem = document.createElement(nodeType);
    if ( typeof attributes != 'undefined' && attributes ) {
      for ( var key in attributes ) {
        elem[key] = attributes[key];
      }
    }
    if ( typeof style != 'undefined' && style ) {
      for ( var key in style ) {
        elem.style[key] = style[key];
      }
    }
    return elem;
  };
  var eventListener = (function() {
    if ( typeof window.addEventListener != 'undefined' ) {
      return 'addEventListener';
    } else if ( typeof window.attachEvent != 'undefined' ) {
      return 'attachEvent';
    }
  })();
  window[eventListener]('load', function() {
    document.body.appendChild(ul);
  });
  window.onerror = function(msg, url, line) {
    console.log('Error: '+ msg +' on line: '+ line + ' in ' + url);
    return true;
  };
}