How to set delay in jquery

In front-end development, we often need to use jQuery to handle some interactive effects and animation effects, such as animation effects when the mouse is hovering, animation effects when the page is loading, etc. But sometimes we need to set a delay time so that these effects can be better expressed.

So, how to set the delay in jQuery? This article will introduce this issue in detail.

1. Delay method in jQuery

In jQuery, the delay effect can be easily achieved by using the delay() method. The delay() method can be used to delay calls to fadeIn(), fadeOut(), slideUp(), slideDown(), animate() and other methods. For example:

$("div").delay(1000).fadeOut();

The above code indicates that the fade-out effect of the div element will be delayed for 1 second. The delay() method accepts a number of milliseconds representing the delay time as a parameter.

2. Notes on delay methods

When using the delay() method, you need to pay attention to the following points:

(1) Only applies to jQuery Animation method

delay() method is only applicable to jQuery animation method. If you want to delay a custom JavaScript method, you need to use the setTimeout() method.

(2) Does not affect non-animated methods in the queue

If there are both non-animated methods and animated methods in the queue, the delay() method will only delay the animation method, not Affects the execution time of non-animated methods.

(3) Delay cannot be interrupted

When using the delay() method, if you need to interrupt the delay effect, you can only achieve it by calling the clearQueue() method.

3. Timer methods in jQuery

In addition to using the delay() method, we can also use the timer methods in jQuery, such as setTimeout() and setInterval( )method. These two methods can be used to perform certain operations within specified time intervals, which can achieve more personalized timing effects.

The setTimeout() method is used to perform an operation after a specified time. The usage method is as follows:

setTimeout(function() { //执行操作 }, 1000);//1秒后执行

The setInterval() method is used to perform an operation every certain time. The usage method is as follows:

setInterval(function() { //执行操作 }, 1000);//每隔1秒钟执行一次

It should be noted that when using the timer method, the timer needs to be cleared, otherwise the problem of infinite loop execution of the timer will occur. Timers can be cleared using the clearTimeout() and clearInterval() methods.

4. Summary

Through the introduction of this article, we have learned about the use of delay method delay() and timer methods setTimeout() and setInterval() in jQuery. Precautions. When writing front-end code, choosing an appropriate delay method can achieve more personalized interaction effects and animation effects, and improve user experience.

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