Vim：如何从一个缓冲区读取到另一个缓冲区(Vim: How to read from one buffer into another)

 在代码停止执行之前，屏幕不会呈现。 这几乎总是期望的行为，因为它阻止DOM呈现不一致的状态。 
 
 假设您确实需要运行长同步任务，并且可以修复它或将其推迟到webworker ，那么解决方案是使用setTimeout ： 
 
 
 
 
 
  
function run_test() {
    $('#test1').hide();
    $('#test2').show();
    
    setTimeout(function(){
       long_synchronous_function_call()
    
       $('#test2').hide();
       $('#test1').show();
    },0);
}

function long_synchronous_function_call() {
    $('#test1').html('<p>Some other data</p>');
    var date = new Date();
	while ((new Date()) - date <= 5000) {}
}
 
  
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js"></script>
<div id="test1">
    <p>Some data</p>
</div>

<div id="test2" style="display:none">
    <p>Loading...</p>
</div>

<button onclick="run_test()">Call a long synchronous function!</button>
 
 
 
 
 
 只是为了确保我没有帮你隐藏一个bug： 永远不要做同步ajax调用 。 
 
 当你在浏览器中真正进行合法且有些长时间的同步操作时（例如计算或构建复杂的GUI），做我的建议是合理的。 

The screen won't be rendered until your code stops execution. This is almost always the desired behavior, as it prevents the rendering of the DOM in an inconsistent state.
 
Supposing you really need to run a long synchronous task, and you can fix that or defer it to a webworker, then a solution is to use setTimeout:
 
 
 
 
 
  
function run_test() {
    $('#test1').hide();
    $('#test2').show();
    
    setTimeout(function(){
       long_synchronous_function_call()
    
       $('#test2').hide();
       $('#test1').show();
    },0);
}

function long_synchronous_function_call() {
    $('#test1').html('<p>Some other data</p>');
    var date = new Date();
	while ((new Date()) - date <= 5000) {}
}
 
  
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js"></script>
<div id="test1">
    <p>Some data</p>
</div>

<div id="test2" style="display:none">
    <p>Loading...</p>
</div>

<button onclick="run_test()">Call a long synchronous function!</button>
 
 
 
 
 
Just to be sure I'm not helping you hiding a bug: NEVER do synchronous ajax calls.
 
It is reasonable to do what I suggest when you really have a legitimate and somewhat long synchronous operation happening in your browser, though (for example a computation or the building of a complex GUI).