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第一次提交等待部署
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'use strict';

var eventUtils = require('./event')
  , JSON3 = require('json3')
  , browser = require('./browser')
  ;

var debug = function() {};
if (process.env.NODE_ENV !== 'production') {
  debug = require('debug')('sockjs-client:utils:iframe');
}

module.exports = {
  WPrefix: '_jp'
, currentWindowId: null

, polluteGlobalNamespace: function() {
    if (!(module.exports.WPrefix in global)) {
      global[module.exports.WPrefix] = {};
    }
  }

, postMessage: function(type, data) {
    if (global.parent !== global) {
      global.parent.postMessage(JSON3.stringify({
        windowId: module.exports.currentWindowId
      , type: type
      , data: data || ''
      }), '*');
    } else {
      debug('Cannot postMessage, no parent window.', type, data);
    }
  }

, createIframe: function(iframeUrl, errorCallback) {
    var iframe = global.document.createElement('iframe');
    var tref, unloadRef;
    var unattach = function() {
      debug('unattach');
      clearTimeout(tref);
      // Explorer had problems with that.
      try {
        iframe.onload = null;
      } catch (x) {
        // intentionally empty
      }
      iframe.onerror = null;
    };
    var cleanup = function() {
      debug('cleanup');
      if (iframe) {
        unattach();
        // This timeout makes chrome fire onbeforeunload event
        // within iframe. Without the timeout it goes straight to
        // onunload.
        setTimeout(function() {
          if (iframe) {
            iframe.parentNode.removeChild(iframe);
          }
          iframe = null;
        }, 0);
        eventUtils.unloadDel(unloadRef);
      }
    };
    var onerror = function(err) {
      debug('onerror', err);
      if (iframe) {
        cleanup();
        errorCallback(err);
      }
    };
    var post = function(msg, origin) {
      debug('post', msg, origin);
      setTimeout(function() {
        try {
          // When the iframe is not loaded, IE raises an exception
          // on 'contentWindow'.
          if (iframe && iframe.contentWindow) {
            iframe.contentWindow.postMessage(msg, origin);
          }
        } catch (x) {
          // intentionally empty
        }
      }, 0);
    };

    iframe.src = iframeUrl;
    iframe.style.display = 'none';
    iframe.style.position = 'absolute';
    iframe.onerror = function() {
      onerror('onerror');
    };
    iframe.onload = function() {
      debug('onload');
      // `onload` is triggered before scripts on the iframe are
      // executed. Give it few seconds to actually load stuff.
      clearTimeout(tref);
      tref = setTimeout(function() {
        onerror('onload timeout');
      }, 2000);
    };
    global.document.body.appendChild(iframe);
    tref = setTimeout(function() {
      onerror('timeout');
    }, 15000);
    unloadRef = eventUtils.unloadAdd(cleanup);
    return {
      post: post
    , cleanup: cleanup
    , loaded: unattach
    };
  }

/* eslint no-undef: "off", new-cap: "off" */
, createHtmlfile: function(iframeUrl, errorCallback) {
    var axo = ['Active'].concat('Object').join('X');
    var doc = new global[axo]('htmlfile');
    var tref, unloadRef;
    var iframe;
    var unattach = function() {
      clearTimeout(tref);
      iframe.onerror = null;
    };
    var cleanup = function() {
      if (doc) {
        unattach();
        eventUtils.unloadDel(unloadRef);
        iframe.parentNode.removeChild(iframe);
        iframe = doc = null;
        CollectGarbage();
      }
    };
    var onerror = function(r) {
      debug('onerror', r);
      if (doc) {
        cleanup();
        errorCallback(r);
      }
    };
    var post = function(msg, origin) {
      try {
        // When the iframe is not loaded, IE raises an exception
        // on 'contentWindow'.
        setTimeout(function() {
          if (iframe && iframe.contentWindow) {
              iframe.contentWindow.postMessage(msg, origin);
          }
        }, 0);
      } catch (x) {
        // intentionally empty
      }
    };

    doc.open();
    doc.write('<html><s' + 'cript>' +
              'document.domain="' + global.document.domain + '";' +
              '</s' + 'cript></html>');
    doc.close();
    doc.parentWindow[module.exports.WPrefix] = global[module.exports.WPrefix];
    var c = doc.createElement('div');
    doc.body.appendChild(c);
    iframe = doc.createElement('iframe');
    c.appendChild(iframe);
    iframe.src = iframeUrl;
    iframe.onerror = function() {
      onerror('onerror');
    };
    tref = setTimeout(function() {
      onerror('timeout');
    }, 15000);
    unloadRef = eventUtils.unloadAdd(cleanup);
    return {
      post: post
    , cleanup: cleanup
    , loaded: unattach
    };
  }
};

module.exports.iframeEnabled = false;
if (global.document) {
  // postMessage misbehaves in konqueror 4.6.5 - the messages are delivered with
  // huge delay, or not at all.
  module.exports.iframeEnabled = (typeof global.postMessage === 'function' ||
    typeof global.postMessage === 'object') && (!browser.isKonqueror());
}