canvas点击出现爱心效果

点击存储每个对象
绘制心的时候可以自己多试几次，我这里心画的不是很标准
完整代码
<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>阁下</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            width: 100%;
            height: 100vh;
            user-select: none;
            background-image: url(04.png);
            background-size: 100%;
            background-repeat: no-repeat;
        }

        canvas {
            position: absolute;
            left: 0;
            top: 0;
            z-index: -100;
        }
        .text{
            position: absolute;
            left: 50%;
            top: 50%;
            transform: translate(-50%,-50%);
            font-size: 36px;
            color: rgba(255, 255, 255, 0.5);
            text-shadow: 0  0 10px rgb(255,255,255);
        }
    </style>
</head>
<body>
    <canvas id="canvas"></canvas>
    <script>
        var canvas = document.getElementById("canvas");
        var ctx = canvas.getContext("2d");

        var kuan=0;gao=0;
        window.addEventListener("resize",resizeFun)
        function resizeFun(){
            kuan = canvas.width = window.innerWidth;
            gao = canvas.height = window.innerHeight;
        }
        resizeFun();
        var arr = [];
        window.addEventListener("click",function(e){
            arr.push({
                x:e.clientX,
                y:e.clientY,
                color:`rgba(${parseInt(Math.random() * 255)}, ${parseInt(Math.random() * 255)}, ${parseInt(Math.random() * 255)},1)`,
                diaphaneity:1,//透明度默认是1
            });
            draw();
        })
        // 绘制
        function draw(){
            for(let i = 0;i<arr.length;i++){
                ctx.beginPath();
                ctx.strokeStyle = arr[i].color;
                ctx.lineWidth = "1";
                ctx.lineJoin = "round";
                // 开始绘制
                ctx.moveTo(arr[i].x,arr[i].y);
                ctx.lineTo(arr[i].x - 15,arr[i].y - 15);
                // 贝塞尔二次曲线
                ctx.quadraticCurveTo(arr[i].x - 26, arr[i].y-32 , arr[i].x-5, arr[i].y - 30);
                ctx.lineTo(arr[i].x,arr[i].y - 26);

                ctx.lineTo(arr[i].x + 5, arr[i].y - 30);
                ctx.quadraticCurveTo(arr[i].x + 26, arr[i].y-32 , arr[i].x + 15, arr[i].y - 15);
                ctx.lineTo(arr[i].x,arr[i].y);
                ctx.fillStyle = arr[i].color;
                ctx.fill();
                ctx.stroke();
            }
        }
        // 更新
        function update(){
            for(let i = 0;i<arr.length;i++){
                arr[i].y -= 1;
                let old = arr[i].diaphaneity;
                arr[i].diaphaneity -= 0.01;
                arr[i].color = arr[i].color.replace(old+")",arr[i].diaphaneity+")"); 
                // 当离开屏幕或透明度小于0时删掉
                if(arr[i].y < 20 || arr[i].diaphaneity < 0){
                    arr.splice(i,1);
                }
            }
        }
        
        setInterval(function(){
            ctx.clearRect(0,0,kuan,gao);

            update();
            draw();
        },20)
    </script>
</body>
</html>
canvas点击出现爱心效果

悦读
