jquery animation set uniform speed

In web development, animation effects are very common. Animation effects can improve user experience and make web pages more lively and interesting. In the process of realizing animation effects, jQuery is a very commonly used tool. It provides us with rich and convenient animation setting methods, including the setting of uniform animation.

Uniform animation, that is, the speed of the object always remains unchanged during the animation process. It is simpler than other types of animation effects, but it is very practical in certain scenarios. So, how to set a uniform animation in jQuery? Let’s introduce it in detail below.

First of all, the method you need to use to set uniform animation in jQuery is animate(). Through the animate() method, we can implement custom animation effects for specified elements. In this method, we can use the step parameter to specify the effect of uniform animation.

So, what is the step parameter? Simply put, it is a function that is called at each frame of the animation. We can achieve different animation effects by setting appropriate logic in the step function. Set the step parameter to a function. The example is as follows:

$(selector).animate({
    // 动画的属性和值
},
{
    duration: 1000, // 动画执行的时间
    step: function (now, fx) {
        // 设置匀速动画
    }
});

In the above code, we set the animation execution time through the second parameter in the animate() method. The parameter step represents the callback function that will be called at each frame of the animation process. This callback function has two parameters, now represents the current attribute value (can be a number or a string), and fx represents the current animation object.

In the step() function, we can achieve uniform animation by operating on the now attribute. The implementation of uniform animation is to make the value of now increase with time, rather than accelerating or decelerating. Here we can calculate the value of now through a simple formula: now = start (end - start)*p, where start and end are the start value and end value of the attribute respectively, and p represents the current time in the total time. Scale, its value is between 0 and 1.

The following is a simple example to show how to implement uniform animation in jQuery:

HTML code:

<div id="box"></div>

CSS code:

#box {
    width: 100px;
    height: 100px;
    background-color: red;
    position: absolute;
    left: 0;
}

JS code:

$(document).ready(function () {
    $("#box").animate({
        left: "400px"
    },
    {
        duration: 5000,
        step: function (now, fx) {
            $(this).css("left", now);
        }
    });
});

In this example, we moved a div element with a width and height of 100px and a red background color by 400px to the right, and executed it for 5 seconds. In the step() function, we set the current left attribute value to the now value, thus achieving a uniform moving animation effect.

Therefore, by using the above method, we can easily set a uniform animation effect in jQuery. Of course, in actual development, in addition to uniform animation, there are many other types of animation effects that we need to understand and learn. Through continuous practice and accumulation, we can better master jQuery's animation setting methods, thereby achieving richer, more vivid and interesting web page animation effects.

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