jQuery JavaScript 在继续之前休眠/等待
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JavaScript sleep/wait before continuing
提问by user2370460
I have a JavaScript code that I need to add a sleep/wait function to. The code I am running is already in a function, eg:
我有一个 JavaScript 代码，需要向其中添加睡眠/等待功能。我正在运行的代码已经在一个函数中，例如：
function myFunction(time)
{
alert('time starts now');
//code to make the program wait before continuing
alert('time is up')
}
I have heard that a possible solution might include
我听说一个可能的解决方案可能包括
setTimeout
but I am not sure how to use it in this case.
但我不确定在这种情况下如何使用它。
I can't use PHP, as my server does not support it, although using jQuery would be fine.
我不能使用 PHP，因为我的服务器不支持它，尽管使用 jQuery 会很好。
回答by BeNdErR
JS does not have a sleep function, it has setTimeout()or setInterval()functions.
JS 没有睡眠函数，它有setTimeout()或setInterval()函数。
If you can move the code that you need to run after the pause into the setTimeout()callback, you can do something like this:
如果您可以将暂停后需要运行的代码移动到setTimeout()回调中，您可以执行以下操作：
//code before the pause
setTimeout(function(){
//do what you need here
}, 2000);
see example here : http://jsfiddle.net/9LZQp/
请参阅此处的示例：http: //jsfiddle.net/9LZQp/
This won't halt the execution of your script, but as long as setTimeout()is an asynchronous function, this code
这不会停止脚本的执行，但只要setTimeout()是异步函数，此代码
console.log("HELLO");
setTimeout(function(){
console.log("THIS IS");
}, 2000);
console.log("DOG");
will print this in the console:
将在控制台中打印：
HELLO
DOG
THIS IS
(note that DOGis printed before THIS IS)
（注意DOG打印在THIS IS之前）
You can use the following code to simulate a sleep for short periods of time:
您可以使用以下代码来模拟短时间的睡眠：
function sleep(milliseconds) {
var start = new Date().getTime();
for (var i = 0; i < 1e7; i++) {
if ((new Date().getTime() - start) > milliseconds){
break;
}
}
}
now, if you want to sleep for 1 second, just use:
现在，如果你想睡一秒钟，只需使用：
sleep(1000);
example: http://jsfiddle.net/HrJku/1/
示例：http: //jsfiddle.net/HrJku/1/
please note that this code will keep your script busy for n milliseconds. This will not only stop execution of Javascript on your page, but depending on the browser implementation, may possibly make the page completely unresponsive, and possibly make the entire browser unresponsive. In other words this is almost always the wrong thing to do.
请注意，此代码将使您的脚本忙碌n 毫秒。这不仅会停止在您的页面上执行 Javascript，而且根据浏览器的实现，可能会使页面完全无响应，并可能使整个浏览器无响应。换句话说，这几乎总是错误的做法。
