javascript 如何创建javascript延迟函数
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How to create javascript delay function
提问by user2370460
I have a javascript file, and in several places I want to add a small delay, so the script would reach that point, wait 3 seconds, and then continue with the rest of the code. The best way that I thought of doing this was to create a function, which I could call from anywhere in the script.
我有一个 javascript 文件，在几个地方我想添加一个小的延迟，所以脚本会到达那个点，等待 3 秒，然后继续执行其余的代码。我想到的最好的方法是创建一个函数，我可以从脚本的任何地方调用它。
function startDelay(lengthOfDelay)
{
//code to make it delay for lengthOfDelay amount of time
}
However, I can not find any way to implement the code to make it wait. I had a look at setTimeout, but you needed to hard code the function into it, which made it no good for me.
但是，我找不到任何方法来实现代码以使其等待。我查看了 setTimeout，但您需要将函数硬编码到其中，这对我不利。
Is there any way that I can get the script to juct pause for a few seconds? I have no problem with the UI freezing whilst the code is paused.
有什么办法可以让脚本暂停几秒钟？代码暂停时 UI 冻结没有问题。
If not, is there a way that I could use the PHP sleep()to achieve this? (I know that PHP is server side and Javascript is client side, but maybe there is a way that I have not heard of.)
如果没有，有没有办法可以使用 PHP sleep()来实现这一点？（我知道 PHP 是服务器端而 Javascript 是客户端，但也许有一种我没有听说过的方法。）
回答by Kassem
You do not need to use an anonymous function with setTimeout. You can do something like this:
您不需要将匿名函数与setTimeout. 你可以这样做：
setTimeout(doSomething, 3000);
function doSomething() {
//do whatever you want here
}
回答by DanRedux
Ah yes. Welcome to Asynchronous execution.
没错。欢迎使用异步执行。
Basically, pausing a script would cause the browser and page to become unresponsive for 3 seconds. This is horrible for web apps, and so isn't supported.
基本上，暂停脚本会导致浏览器和页面无响应 3 秒。这对于网络应用程序来说太可怕了，因此不受支持。
Instead, you have to think "event-based". Use setTimeout to call a function after a certain amount of time, which will continue to run the JavaScript on the page during that time.
相反，您必须考虑“基于事件”。使用 setTimeout 在一定时间后调用函数，该函数将在此期间继续运行页面上的 JavaScript。
回答by CBC_NS
You can create a delay using the following example
您可以使用以下示例创建延迟
setInterval(function(){alert("Hello")},3000);
Replace 3000with # of milliseconds
替换3000与＃毫秒
You can place the content of what you want executed inside the function.
您可以将要执行的内容放在函数内。
