有时候ajax加载一个脚本是必要的，但是延迟文档准备直到脚本加载之后。

jQuery通过holdReady()函数支持这一点。

使用示例:

$.holdReady(true);                              //set hold
function releaseHold() { $.holdReady(false); }  //callback to release hold
$.getScript('script.js', releaseHold);          //load script then release hold

实际的脚本加载是异步的(没有错误)，但是如果JavaScript的其余部分在文档就绪后运行，那么效果是同步的。

动态脚本通常会使用这个高级特性 加载器，想要加载额外的JavaScript，如jQuery插件 在允许就绪事件发生之前，即使DOM可能发生 准备好了。

文档: https://api.jquery.com/jquery.holdready

2019年1月7日更新

从JQMIGRATE:

jQuery.holdReady() is deprecated Cause: The jQuery.holdReady() method has been deprecated due to its detrimental effect on the global performance of the page. This method can prevent all the code on the page from initializing for extended lengths of time. Solution: Rewrite the page so that it does not require all jQuery ready handlers to be delayed. This might be accomplished, for example, by late-loading only the code that requires the delay when it is safe to run. Due to the complexity of this method, jQuery Migrate does not attempt to fill the functionality. If the underlying version of jQuery used with jQuery Migrate no longer contains jQuery.holdReady() the code will fail shortly after this warning appears.

警告消息可能是由于主线程中的XMLHttpRequest请求将async标志设置为false。

https://xhr.spec.whatwg.org/ synchronous:

Synchronous XMLHttpRequest outside of workers is in the process of being removed from the web platform as it has detrimental effects to the end user's experience. (This is a long process that takes many years.) Developers must not pass false for the async argument when the JavaScript global environment is a document environment. User agents are strongly encouraged to warn about such usage in developer tools and may experiment with throwing an InvalidAccessError exception when it occurs.

未来的方向是只允许工作线程中的xmlhttprequest。这条消息意在发出这方面的警告。

在Chrome浏览器中，按“F12” 开发工具->按F1。 参见设置->通用->外观:“不显示chrome数据保护警告”-设置此复选框。 参见设置->general->Console:“Log XMLHTTPRequest”-设置此复选框。

享受

Visual Studio 2015/2017的实时调试器正在注入包含弃用调用的代码。

像@Nycen一样，我也得到了这个错误，因为一个链接到Cloudfare。我的是Select2插件。

我刚把它拆了

 src="//cdnjs.cloudflare.com/ajax/libs/select2/4.0.0/js/select2.min.js"

错误消失了。

我在《ZF2》里也遇到过。 我试图加载模式内容，但我忘记禁用布局之前。

So:

$viewModel = new ViewModel();
$viewModel->setTerminal(true);
return $viewModel;