我正在嘗試在香草 javascript 中創建下雨效果。下面是我嘗試過的代碼。我在y每個間隔更新坐標，但需要清除前一行，使其看起來像下降線效果。謝謝var canvas = document.getElementById("DemoCanvas");var ctx = canvas.getContext("2d");class Drop { constructor() { this.x = canvas.width / 2; this.y = 0; this.yspeed = 10; } fall() { this.y = this.y + this.yspeed; } show() { ctx.moveTo(this.x, this.y); ctx.lineTo(this.x, this.y + 10); ctx.stroke(); }}if (canvas.getContext) { let d = new Drop(); setInterval(() => { d.show(); d.fall(); }, 500);}<body> <canvas id="DemoCanvas" width="1400" height="1400"></canvas></body>
如何在香草javascript中制作移動線？
喵喵時光機
2022-10-27 14:44:49
