JavaScript - jQuery 间隔
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JavaScript - jQuery interval
提问by blasteralfred Ψ
I am using JavaScript with jQuery. I have the following script to alert hievery 30 seconds.
我在 jQuery 中使用 JavaScript。我有以下脚本hi每 30 秒发出一次警报。
$(document).ready( function() {
alert("hi");
setInterval(function() {
alert("hi");
}, 30000);
});
I want to alert hiwhen the page loads (when document / page gets completely loaded) and on every 30 seconds interval afterwards (like hi(0s) - hi(30s) - hi(60s).. etc). But my solution works on two instances. One on DOM ready and the other in a loop. Is there any way to do the same in a single instance?
我想hi在页面加载时（当文档/页面完全加载时）以及之后每 30 秒间隔（如hi(0s) - hi(30s) - hi(60s) 等）发出警报。但我的解决方案适用于两个实例。一个在 DOM 上准备好，另一个在循环中。有没有办法在单个实例中做同样的事情？
You can see my fiddle here.
你可以在这里看到我的小提琴。
回答by tvanfosson
You could use setTimeout instead and have the callback reschedule itself.
您可以改用 setTimeout 并重新安排回调本身。
$(function() {
sayHi();
function sayHi() {
setTimeout(sayHi,30000);
alert('hi');
}
});
回答by Rob W
Wrap your code in a function. Then, pass the function as a first argument to setInterval, and call the function:
将您的代码包装在一个函数中。然后，将该函数作为第一个参数传递给setInterval，并调用该函数：
$(document).ready( function() {
//Definition of the function (non-global, because of the previous line)
function hi(){
alert("hi");
}
//set an interval
setInterval(hi, 30000);
//Call the function
hi();
});
回答by Ondrej Simek
Well, there probably is a way of doing it in just one call..
好吧，可能有一种方法可以在一次通话中做到这一点。
setInterval(
(function x() {
alert('hi');
return x;
})(), 30000);
Another solution would be to use arguments.callee, but as it is now deprecated, it is generally not recommended to use it.
另一种解决方案是使用arguments.callee，但由于它现在已被弃用，因此通常不建议使用它。
setInterval(
(function() {
alert('hi');
return arguments.callee;
})(), 30000);
回答by Darin Dimitrov
No, that's not possible with setInterval. You could use setTimeout for example:
不，这是不可能的setInterval。您可以使用 setTimeout 例如：
function foo() {
alert('hi');
setTimeout(foo, 30000);
}
$(function() {
foo();
});
回答by daryl
$(function() {
function heythere() {
alert('hi');
setTimeout(heythere,30000);
}
heythere();
});
If you want it to only run once after 30 seconds, you are looking to use setTimeoutnot setInterval.
如果您希望它在 30 秒后仅运行一次，则您希望使用setTimeoutnot setInterval。
