Case closed: Use CSS to achieve this effect.

Thank you for your help, I switched to CSS to realize this effect.

1. In the following code, I listened to the mouseover and mouseout events of the a tag to trigger the canvas animation. I prevented the event from bubbling in the callbacks of mouseover and mouseout, but when the mouse moves to the two spans inside a The mouseout of a is still triggered, and the mouseover is retriggered when returning to a, causing the animation to be interrupted and executed repeatedly.

Could you please help me see what’s wrong with the following code?

Supplementary animation pictures!

<a href="/map.html" class="material-block top-border-54c889" data-color="#54c889">
    <span class="menu-index-svg"><svg class="icon" width="32px" height="32px" viewBox="0 0 1025 1024" version="1.1" xmlns="http://www.w3.org/2000/svg"></svg></span>
    <span class="menu-index-text">地图监控</span>
    <canvas style="width: 100%; height: 100%;" width="160" height="90"></canvas>
</a>

<script>
var canvas = {},
    centerX = 0,
    centerY = 0,
    color = '',
    containers = document.getElementsByClassName('material-block'),
    context = {},
    element = {},
    radius = 0

    requestAnimFrame = function () {
        return (
            window.requestAnimationFrame ||
            window.mozRequestAnimationFrame ||
            window.oRequestAnimationFrame ||
            window.msRequestAnimationFrame ||
            function (callback) {
                window.setTimeout(callback, 1000 / 60);
            }
        );
    }(),

    init = function () {
        containers = Array.prototype.slice.call(containers);
        for (var i = 0; i < containers.length; i += 1) {
            canvas = document.createElement('canvas');
            console.log(containers[i]);
            containers[i].addEventListener('mouseover', press, false);
            containers[i].addEventListener('mouseout', pressout, false);
            containers[i].appendChild(canvas);
            canvas.style.width = '100%';
            canvas.style.height = '100%';
            canvas.width = canvas.offsetWidth;
            canvas.height = canvas.offsetHeight;
        }
    },

    press = function (event) {
        console.log('press');
        color = event.toElement.parentElement.dataset.color;
        element = event.toElement;
        context = element.getContext('2d');
        radius = 0;
        centerX = 0;
        centerY = 0;
        context.clearRect(0, 0, element.width, element.height);
        draw();
        event.stopPropagation();
    },

    pressout = function (event) {
        console.log('pressout');
        event.stopPropagation();
    },

    draw = function () {
        context.beginPath();
        context.arc(centerX, centerY, radius, 0, 2 * Math.PI, false);
        context.fillStyle = color;
        context.fill();
        radius += 15;
        if (radius < element.width + 100) {
            requestAnimFrame(draw);
        }
    };

init();
</script>