Twitter处理防止被iframe的方式

Twitte_avoid_iframed.js

function bust () {
  document.write = "";
  window.top.location = window.self.location;
  setTimeout(function() {
    document.body.innerHTML = '';
  }, 0);
  window.self.onload = function(evt) {
    document.body.innerHTML = '';
  };
}

if (window.top !== window.self) { 
  // are you trying to put self in an iframe?
  try {
    if (window.top.location.host) { 
      // this is illegal to access unless you share a non-spoofable document domain
      // fun times
    } else {
      bust(); // chrome executes this
    }
  } catch (ex) {
    bust(); // everyone executes this
  }
}