无意间看到这么一段代码，感觉很眼熟，但是和之前的又不一样！
这段代码完全无需依靠第三方库的支持，也可以自己修改参数，达到自己想要的效果，浏览器全屏之后还可以当屏保用。
拿走请直接复制
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<!DOCTYPE html> <html lang=""> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>JS特效代码-www.dz9.net</title> <meta name="viewport" content="width=device-width, initial-scale=1"> <style type="text/css"> html { overflow: hidden; touch-action: none; content-zooming: none; } body { position: absolute; margin: 0; padding: 0; width: 100%; height: 100%; background: #000; } canvas { width: 100%; height: 100%; background: #000; position: absolute; } </style> </head> <body style="overflow: hidden;"> <canvas id='c'></canvas> <script type="text/javascript"> // ge1doot 25 Oct 2015 // vector 2D 'use strict'; function Vector(x, y) { this.x = x || 0.0; this.y = y || 0.0; } Vector.prototype.set = function(x, y) { this.x = x; this.y = y; return this; } Vector.prototype.copy = function(v) { this.x = v.x; this.y = v.y; return this; } Vector.prototype.sub = function(v1, v2) { this.x = v1.x - v2.x; this.y = v1.y - v2.y; return this; } Vector.prototype.selfSub = function(v) { this.x -= v.x; this.y -= v.y; return this; } Vector.prototype.mult = function(v, f) { this.x = v.x * f; this.y = v.y * f; return this; } Vector.prototype.selfMult = function(f) { this.x *= f; this.y *= f; return this; } Vector.prototype.div = function(v, f) { this.x = v.x / f; this.y = v.y / f; return this; } Vector.prototype.selfDiv = function(f) { this.x /= f; this.y /= f; return this; } Vector.prototype.add = function(v1, v2) { this.x = v1.x + v2.x; this.y = v1.y + v2.y; return this; } Vector.prototype.selfAdd = function(v) { this.x += v.x; this.y += v.y; return this; } Vector.prototype.limit = function(maxLength) { var lengthSquared = this.x * this.x + this.y * this.y; if ((lengthSquared > maxLength * maxLength) && (lengthSquared > 0)) { var ratio = maxLength / Math.sqrt(lengthSquared); this.x *= ratio; this.y *= ratio; } return this; } Vector.prototype.dist2 = function(v) { return ((this.x - v.x) * (this.x - v.x) + (this.y - v.y) * (this.y - v.y)); } Vector.prototype.mag2 = function() { return (this.x * this.x + this.y * this.y); } // ge1doot - 25 Oct 2015 // canvas pointer utility 'use strict'; var canvas = { elem: document.createElement('canvas'), _resize: function() { this.width = this.elem.width = this.elem.offsetWidth; this.height = this.elem.height = this.elem.offsetHeight; this.resize && this.resize(); }, init: function() { var ctx = this.elem.getContext('2d'); document.body.appendChild(this.elem); window.addEventListener('resize', this._resize.bind(this), false); this._resize(); return ctx; }, setCursor: function (type) { if (type !== this.cursor) { this.cursor = type; this.elem.style.cursor = type; } }, pointer: function() { var pointer = { x: 0, y: 0, isDown: false }; pointer.move = function(e) { var touchMode = e.targetTouches, pointer; if (touchMode) { e.preventDefault(); pointer = touchMode[0]; } else pointer = e; this.x = pointer.clientX; this.y = pointer.clientY; } pointer.bind = function(elem, events, fn) { for (var i = 0, e = events.split(','); i < e.length; i++) { elem.addEventListener(e[i], fn.bind(pointer), false); } } pointer.bind(window, 'mousemove,touchmove', function(e) { this.move(e); }); pointer.bind(canvas.elem, 'mousedown,touchstart', function(e) { this.move(e); this.isDown = true; this.down && this.down(); }); pointer.bind(window, 'mouseup,touchend,touchcancel', function(e) { e.preventDefault(); this.isDown = false; this.up && this.up(); }); return pointer; } }; /* Spheres - v.1.0.0 - 2014/01/03 PROCESSINGJS.COM HEADER ANIMATION MIT License - F1lT3R/Hyper-Metrix Modified by Casey Reas, 7 Nov 2013 Modified by slsdo, 3 Jan 2014 Javascript adaptation by ge1doot, 25 Oct 2015 */ ~ function() { 'use strict'; // setup var count = 60, circles = [], ds = 2, dragging = false, colors = ['#f80', '#08f', '#666'], maxRad, grd; // Circle constructor function Circle() { this.rad = 10 + Math.random() * maxRad; // radius this.rad2 = this.rad * this.rad; this.pos = new Vector(canvas.width * Math.random(), canvas.height * Math.random()); // Location this.vel = new Vector(Math.random() - 0.5, Math.random() - 0.5); // Speed this.acc = new Vector(); // Acceleration this.offset = new Vector(); // Offset from mouse this.force = new Vector(); // force this.c = colors[Math.floor(Math.random() * colors.length)]; // Color this.locked = false; this.parent = null; this.k = 0.1; // Spring constant this.damp = 0.98; // Damping } // circle update Circle.prototype.update = function() { this.acc.set(0, 0); if (this.locked && this.parent === null) { // Move the particle's coordinates to the mouse's position, minus its original offset this.acc.sub(this.force.sub(pointer, this.offset), this.pos).limit(1); this.vel.selfAdd(this.acc).limit(3); // Apply acceleration this.pos.sub(pointer, this.offset); } else if (this.locked && this.parent !== null && this.pos.dist2(this.parent.pos) >= this.parent.rad2) { // Move the particle's coordinates to the parent's position, minus its original offset this.force.sub(this.pos, this.parent.pos).selfMult(-this.k); this.acc.div(this.force, this.rad * 0.5); // Set acceleration this.vel.mult(this.force.add(this.vel, this.acc), this.damp).limit(14); // Set velocity this.pos.selfAdd(this.vel); // Updated position } else { this.vel.selfAdd(this.acc.limit(1)); // Apply acceleration if (this.vel.mag2() > 0.5 * 0.5) { this.vel.selfMult(0.99); // Velocity damping } this.pos.selfAdd(this.vel); // Move circle } var dm = this.rad * 1; // Cache diameter // Wrap around canvas edges if (this.pos.x < -dm) this.pos.x = canvas.width + dm; if (this.pos.x > canvas.width + dm) this.pos.x = -dm; if (this.pos.y < -dm) this.pos.y = canvas.height + dm; if (this.pos.y > canvas.height + dm) this.pos.y = -dm; }; // circle render Circle.prototype.render = function() { ctx.beginPath(); if (this.pos.dist2(pointer) < this.rad2) { ctx.fillStyle = '#f20'; ctx.globalAlpha = 0.35; pointer.over = true; } else { ctx.fillStyle = this.c; ctx.globalAlpha = 0.35; } ctx.arc(this.pos.x, this.pos.y, this.rad, 0, 2 * Math.PI); ctx.fill(); ctx.strokeStyle = '#777777'; ctx.globalAlpha = 0.35; // Loop through all circles for (var j = 0; j < count; j++) { var that = circles[j]; // If the circles are close if (this.pos.dist2(that.pos) < this.rad2 * 1.44) { // Stroke a line from current circle to adjacent circle ctx.beginPath(); ctx.moveTo(this.pos.x, this.pos.y); ctx.lineTo(that.pos.x, that.pos.y); ctx.stroke(); // Attach it to parent if (this.locked && !that.locked) { that.locked = true; that.parent = this; } } else if (that.parent != null && that.parent === this) { ctx.beginPath(); ctx.moveTo(this.pos.x, this.pos.y); ctx.lineTo(that.pos.x, that.pos.y); // Link to parent ctx.stroke(); } } ctx.fillStyle = '#fff'; ctx.fillRect(this.pos.x - ds, this.pos.y - ds, ds * 2, ds * 2); // Draw dot in center of circle }; // main draw loop function draw() { requestAnimationFrame(draw); ctx.clearRect(0, 0, canvas.width, canvas.height); ctx.globalCompositeOperation = 'lighter'; pointer.over = false; // looping through circle array for (var i = 0; i < count; i++) { circles[i].update(); circles[i].render(); } // cursor if (dragging) { canvas.setCursor('move'); } else { if (pointer.over) canvas.setCursor('pointer'); else canvas.setCursor('default'); } // vignette ctx.globalAlpha = 1; ctx.globalCompositeOperation = 'source-over'; ctx.fillStyle = grd; ctx.fillRect(0, 0, canvas.width, canvas.height); } // create canvas context and pointer var ctx = canvas.init(); // canvas resize event function canvas.resize = function() { // radius maxRad = Math.round(Math.sqrt(Math.min(this.width, this.height)) * 5); // vignette var outerRadius = this.width * 0.7; var innerRadius = this.height * 0.3; grd = ctx.createRadialGradient(this.width / 2, this.height / 2, innerRadius, this.width / 2, this.height / 2, outerRadius); grd.addColorStop(0, 'rgba(0,0,0,0)'); grd.addColorStop(1, 'rgba(0,0,0,1)'); }; canvas.resize(); // pointer var pointer = canvas.pointer(); // pointer down event pointer.down = function() { // Look for a circle the mouse is in, then lock that circle to the mouse for (var i = 0; i < count; i++) { // If the circles are close... if (circles[i].pos.dist2(this) < circles[i].rad2) { circles[i].locked = true; circles[i].offset.sub(this, circles[i].pos); dragging = true; // Break out of the loop because we found our circle break; } } }; // pointer up event pointer.up = function() { // User is no-longer dragging for (var i = 0; i < count; i++) { circles[i].offset.set(0, 0); circles[i].locked = false; circles[i].parent = null; // Clear parent } dragging = false; }; // create circles for (var i = 0; i < count; i++) { circles[i] = new Circle(); } // start draw(); }(); </script> </body> </html> |
要作为网站特效背景的话，这段代码应该放在哪个位置？
@欢笑久久 你可以先把JS代码拆分开，这样看起来不会那么乱，然后剩下的就需要用到CSS相关知识了。
@东少 诶，好吧，没什么CSS基础。。还是不用了，谢谢了