2012 年 1 月 4 日更新

似乎您不能像以前一样在 FB.init() 之后立即调用依赖于 FB 的方法(例如 FB.getAuthResponse())，因为FB.init() 现在似乎是异步的.将您的代码包装到 FB.getLoginStatus() 响应中似乎可以检测 API 何时完全就绪:

It seems like you can't just call FB-dependent methods (for example FB.getAuthResponse()) right after FB.init() like before, as FB.init() seems to be asynchronous now. Wrapping your code into FB.getLoginStatus() response seems to do the trick of detecting when API is fully ready:

window.fbAsyncInit = function() {
    FB.init({
        //...
    });

    FB.getLoginStatus(function(response){
        runFbInitCriticalCode(); 
    });

};  

或者如果使用下面的 fbEnsureInit() 实现:

or if using fbEnsureInit() implementation from below:

window.fbAsyncInit = function() {
    FB.init({
        //...
    });

    FB.getLoginStatus(function(response){
        fbApiInit = true;
    });

};  

原帖:

如果你只想在 FB 初始化时运行一些脚本，你可以在 fbAsyncInit 中放入一些回调函数:

If you want to just run some script when FB is initialized you can put some callback function inside fbAsyncInit:

  window.fbAsyncInit = function() {
    FB.init({
      appId  : '<?php echo $conf['fb']['appid']; ?>',
      status : true, // check login status
      cookie : true, // enable cookies to allow the server to access the session
      xfbml  : true  // parse XFBML
    });
    FB.Canvas.setAutoResize();

    runFbInitCriticalCode(); //function that contains FB init critical code
  };

如果你想完全替换 FB.ensureInit 那么你必须自己写一些东西，因为没有官方替换(imo 大错).这是我使用的:

If you want exact replacement of FB.ensureInit then you would have to write something on your own as there is no official replacement (big mistake imo). Here is what I use:

  window.fbAsyncInit = function() {
    FB.init({
      appId  : '<?php echo $conf['fb']['appid']; ?>',
      status : true, // check login status
      cookie : true, // enable cookies to allow the server to access the session
      xfbml  : true  // parse XFBML
    });
    FB.Canvas.setAutoResize();

    fbApiInit = true; //init flag
  };

  function fbEnsureInit(callback) {
        if(!window.fbApiInit) {
            setTimeout(function() {fbEnsureInit(callback);}, 50);
        } else {
            if(callback) {
                callback();
            }
        }
    }

用法:

fbEnsureInit(function() {
    console.log("this will be run once FB is initialized");
});