HTML，CSS，JavaScript实例——3D骰子，跨纬度蠕虫，动态登录表单。

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一、3D筛子

1.HTML

<!--ring div starts here-->
<div class="ring"><i style="--clr:#00ff0a;"></i><i style="--clr:#ff0057;"></i><i style="--clr:#fffd44;"></i><div class="login"><h2>Login</h2><div class="inputBx"><input type="text" placeholder="Username"></div><div class="inputBx"><input type="password" placeholder="Password"></div><div class="inputBx"><input type="submit" value="Sign in"></div><div class="links"><a href="#">Forget Password</a><a href="#">Signup</a></div></div>
</div>
<!--ring div ends here-->

2.CSS

@import url("https://fonts.googleapis.com/css2?family=Quicksand:wght@300&display=swap");
* {margin: 0;padding: 0;box-sizing: border-box;font-family: "Quicksand", sans-serif;
}
body {display: flex;justify-content: center;align-items: center;min-height: 100vh;background: #111;width: 100%;overflow: hidden;
}
.ring {position: relative;width: 500px;height: 500px;display: flex;justify-content: center;align-items: center;
}
.ring i {position: absolute;inset: 0;border: 2px solid #fff;transition: 0.5s;
}
.ring i:nth-child(1) {border-radius: 38% 62% 63% 37% / 41% 44% 56% 59%;animation: animate 6s linear infinite;
}
.ring i:nth-child(2) {border-radius: 41% 44% 56% 59%/38% 62% 63% 37%;animation: animate 4s linear infinite;
}
.ring i:nth-child(3) {border-radius: 41% 44% 56% 59%/38% 62% 63% 37%;animation: animate2 10s linear infinite;
}
.ring:hover i {border: 6px solid var(--clr);filter: drop-shadow(0 0 20px var(--clr));
}
@keyframes animate {0% {transform: rotate(0deg);}100% {transform: rotate(360deg);}
}
@keyframes animate2 {0% {transform: rotate(360deg);}100% {transform: rotate(0deg);}
}
.login {position: absolute;width: 300px;height: 100%;display: flex;justify-content: center;align-items: center;flex-direction: column;gap: 20px;
}
.login h2 {font-size: 2em;color: #fff;
}
.login .inputBx {position: relative;width: 100%;
}
.login .inputBx input {position: relative;width: 100%;padding: 12px 20px;background: transparent;border: 2px solid #fff;border-radius: 40px;font-size: 1.2em;color: #fff;box-shadow: none;outline: none;
}
.login .inputBx input[type="submit"] {width: 100%;background: #0078ff;background: linear-gradient(45deg, #ff357a, #fff172);border: none;cursor: pointer;
}
.login .inputBx input::placeholder {color: rgba(255, 255, 255, 0.75);
}
.login .links {position: relative;width: 100%;display: flex;align-items: center;justify-content: space-between;padding: 0 20px;
}
.login .links a {color: #fff;text-decoration: none;
}

二、跨纬度蠕虫

1.HTML

<div id="controls"></div>

2.CSS

* { margin:0; padding:0; } 
html, body { width:100%; height:100%; overflow: hidden; background:black;} 
canvas { display:block; }
#controls {z-index: 2;margin: 20px;position: absolute;top: 0; left: 0;color: white;
}

3.JS

let maxPoints = 2000;
let addSpeed  = 4;class Vec3{constructor(x, y, z, r=10){this.x = x;this.y = y;this.z = z;this.r = r;this.count = 0;}op(p, f){this.x = f(this.x, p.x != undefined ? p.x : p);this.y = f(this.y, p.y != undefined ? p.y : p);this.z = f(this.z, p.z != undefined ? p.z : p);return this;}plus  (p){return this.op(p, (a, b) => a + b)}minus (p){return this.op(p, (a, b) => a - b)}times (p){return this.op(p, (a, b) => a * b)}div   (p){return this.op(p, (a, b) => a / b)}distTo(p){return Math.hypot(this.x-p.x, this.y-p.y, this.x-p.z)}clone  (){return new Vec3(this.x, this.y, this.z, this.r)}updateRotation(){let {x, y, z} = this.clone().minus(origin);this.screenCoord = [(x*cx - y*sx),(y*cx + x*sx)*cy + sy*z];this.depth = z*cy - sy*(y*cx + x*sx);}render(){this.count++;let amt = this.count/maxPoints;amt = 1-(cos(amt*addSpeed*TAU)+1)/2;amt = pow(amt, .5);noFill();stroke(this.hue, .3, 1, .05);strokeWeight(.5);let r = noise((this.x+frameCount)/200, this.y/200, this.z/200)*50 + 10;rect(...this.screenCoord, r*amt, r*amt);}
}function setup (){pixelDensity(1);createCanvas();colorMode(HSB, 1, 1, 1);rectMode(CENTER);windowResized();
}let points = [];
let r = (n) => random(-n, n);
let v3 = (x, y, z) => new Vec3(x, y, z);
let l3 = (p1, p2, c) => new Line(p1, p2, c);
let rPoint = (n) => v3(r(n), r(n), r(n));let step = 0;
let d = 200;
let t = 0;
let p = 0;
let nextPoint = () => {step++;d = lerp(d, 150, .001);d += (noise(step/100, 1e6)*2-1)*.1;d = constrain(d, 100, 200);t += (noise(step/200, 1e7)*2-1)*.02;p += (noise(step/200, 1e8)*2-1)*.02;let x = d * sin(t) * cos(p);let z = d * sin(t) * sin(p);let y = d * cos(t);let v = v3(x, y, z);v.hue = ((step/3)/maxPoints)%1;return v;
}let init = () => {points = [];step = 0;d = 200;t = 0;p = 0;noiseSeed(random()*1e8);for (let i = 0; i < maxPoints; i++){    points.push(nextPoint());}
}let rotY = -Math.PI/4;
let rotX = .4;
let zoom = 2;
let cx, sx, cy, sy;let near = 500;let mX = 0;
let mY = 0;let origin = new Vec3(0, 0, 0);function draw(){background(0, .3);stroke(1);push();updateCamera();translate(width/2, height/2);scale(zoom);let [x, y] = origin.screenCoord;translate(x, y);let n = near/(zoom*zoom);blendMode(ADD);for (let i = 0; i < addSpeed; i++){points.shift();points.push(nextPoint());}points.map(p => p.updateRotation());points.map(p => p.render());pop();
}let updateCamera = () => {rotX += mX;rotY += mY;rotY = constrain(rotY, -PI, 0);mX *= .9;mY *= .9;[cx, sx, cy, sy] = [cos(rotX), sin(rotX), cos(rotY), sin(rotY)];rotX += .002;origin.updateRotation();
}let pointerIsDown = false;
let prevX = 0;
let prevY = 0;
window.addEventListener("pointerdown", evt => {pointerIsDown = true;prevX = evt.clientX;prevY = evt.clientY;console.log("pointerdown");
});window.addEventListener("pointerup", evt => {pointerIsDown = false;console.log("pointerup");
})window.addEventListener("pointermove", evt => {if (pointerIsDown){let [x, y] = [evt.clientX, evt.clientY];if (prevX && prevY && x && y){let moveX = x-prevX;let moveY = y-prevY;mX = -moveX/100;mY =  moveY/100;prevX = x;prevY = y;}}
});function windowResized(){resizeCanvas(windowWidth, windowHeight);zoom = min(width, height)*2/862;init();
}

三、动态登录表单

1.HTML

<!--ring div starts here-->
<div class="ring"><i style="--clr:#00ff0a;"></i><i style="--clr:#ff0057;"></i><i style="--clr:#fffd44;"></i><div class="login"><h2>Login</h2><div class="inputBx"><input type="text" placeholder="Username"></div><div class="inputBx"><input type="password" placeholder="Password"></div><div class="inputBx"><input type="submit" value="Sign in"></div><div class="links"><a href="#">Forget Password</a><a href="#">Signup</a></div></div>
</div>
<!--ring div ends here-->

2.CSS

@import url("https://fonts.googleapis.com/css2?family=Quicksand:wght@300&display=swap");
* {margin: 0;padding: 0;box-sizing: border-box;font-family: "Quicksand", sans-serif;
}
body {display: flex;justify-content: center;align-items: center;min-height: 100vh;background: #111;width: 100%;overflow: hidden;
}
.ring {position: relative;width: 500px;height: 500px;display: flex;justify-content: center;align-items: center;
}
.ring i {position: absolute;inset: 0;border: 2px solid #fff;transition: 0.5s;
}
.ring i:nth-child(1) {border-radius: 38% 62% 63% 37% / 41% 44% 56% 59%;animation: animate 6s linear infinite;
}
.ring i:nth-child(2) {border-radius: 41% 44% 56% 59%/38% 62% 63% 37%;animation: animate 4s linear infinite;
}
.ring i:nth-child(3) {border-radius: 41% 44% 56% 59%/38% 62% 63% 37%;animation: animate2 10s linear infinite;
}
.ring:hover i {border: 6px solid var(--clr);filter: drop-shadow(0 0 20px var(--clr));
}
@keyframes animate {0% {transform: rotate(0deg);}100% {transform: rotate(360deg);}
}
@keyframes animate2 {0% {transform: rotate(360deg);}100% {transform: rotate(0deg);}
}
.login {position: absolute;width: 300px;height: 100%;display: flex;justify-content: center;align-items: center;flex-direction: column;gap: 20px;
}
.login h2 {font-size: 2em;color: #fff;
}
.login .inputBx {position: relative;width: 100%;
}
.login .inputBx input {position: relative;width: 100%;padding: 12px 20px;background: transparent;border: 2px solid #fff;border-radius: 40px;font-size: 1.2em;color: #fff;box-shadow: none;outline: none;
}
.login .inputBx input[type="submit"] {width: 100%;background: #0078ff;background: linear-gradient(45deg, #ff357a, #fff172);border: none;cursor: pointer;
}
.login .inputBx input::placeholder {color: rgba(255, 255, 255, 0.75);
}
.login .links {position: relative;width: 100%;display: flex;align-items: center;justify-content: space-between;padding: 0 20px;
}
.login .links a {color: #fff;text-decoration: none;
}

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