为WordPress增加动态html5、css3、canvas、jQuery的背景特效

前言

最近感觉站点的背景有点单调，看到有些大佬的博客非常的好看，比如二次元背景、跟随鼠标变换的动态背景等，我就寻思着自己的站点能不能也添加一下背景，多点活力，折腾了几天终于成功啦，现在把教程写下，防止自己忘记。

烟花特效
几何图形
悬浮原点

准备工作

首先呢当然是选择好自己喜欢的背景啦，小哆啦为大家上传了三款动态背景，不定时更新，有愿意分享的小伙伴也可以留言或者私聊我一起分享哦，具体效果请参照上面的GIF动图。

烟花效果点击下载
几何图形点击下载
基于canvas绘制悬浮圆点背景动画特效点击下载

开始替换

打开刚刚下载好的效果文件，文件一般分为三种，html、js、css文件，小哆啦为大家讲解下基于canvas绘制悬浮圆点背景动画特效的添加方法：

提取html中<style></style>中间部分.canvas{}函数

<style>
.canvas {
  position: absolute;
  top: 0;
  left: 0;
  pointer-events: none;
}
</style>

提取canvas

<canvas id="canvas" class="canvas"></canvas

提取script

<script>
'use strict';
var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();
function _possibleConstructorReturn(self, call) { if (!self) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return call && (typeof call === "object" || typeof call === "function") ? call : self; }
function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function, not " + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.proto = superClass; }
function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
var mouse, originx, originy, int, cvs;
/* Safari doesn't support EventTarget 😒 */
var EventTarget = EventTarget || false;
if (EventTarget) {
    EventTarget.prototype.evt = function (event, callback) {
        return this.addEventListener(event, callback);
    };
} else {
    window.evt = function (event, callback) {
        return this.addEventListener(event, callback);
    };
    document.evt = function (event, callback) {
        return this.addEventListener(event, callback);
    };
    Element.prototype.evt = function (event, callback) {
        return this.addEventListener(event, callback);
    };
}
function $(elemId) {
    return document.getElementById(elemId);
}
function init() {
    cvs = $("canvas");
resizeCanvas(cvs);window.evt('resize', resizeCanvas, false);window.evt("mousemove", function (e) {    mouse = getMousePos(cvs, e);    originx = mouse.x;    originy = mouse.y;});// window.evt("touchmove", function (e) {//     originx = e.originalEvent.touches[0].pageX;//     originy = e.originalEvent.touches[0].pageY;// });var network = new Field(0, 0, 50);var emit = new Emitter(0, 0, 50);animateCanvas(cvs, function () {    network.animate();    emit.animate();});
}
var Point = function () {
    function Point(x, y, canvas, dia) {
        _classCallCheck(this, Point);
    this.canvas = canvas || cvs;    this.x = x || 0;    this.y = y || 0;    this.vx = 0;    this.vy = 0;    this.speed = Math.random() * .5 + .2;    this.angle = Math.random() * 360;    this.diaSet = dia || 2 + Math.random() * 10;    this.dia = this.diaSet;    this.age = 0;    var hue = Math.floor(Math.random() * 360);    this.fill = 'hsl(' + hue + ', 95%, 70%)';    this.line = Math.random() > .5 ? true : false;}_createClass(Point, [{    key: 'emit',    value: function emit(life) {        var s = this.speed * 2;        this.angle += Math.random() * 10 - 5;        this.x += s * Math.cos(this.angle * Math.PI / 180);        this.y += s * Math.sin(this.angle * Math.PI / 180);        this.age += 1 / life;        this.boundary();    }}, {    key: 'boundary',    value: function boundary() {        if (this.x < 0) {            this.x = this.canvas.width;        }        if (this.x > this.canvas.width) {            this.x = 0;        }        if (this.y < 0) {            this.y = this.canvas.height;        }        if (this.y > this.canvas.height) {            this.y = 0;        }    }}, {    key: 'field',    value: function field(life) {        var s = this.speed;        this.angle += Math.random() * 10 - 5;        this.x += s * Math.cos(this.angle * Math.PI / 180);        this.y += s * Math.sin(this.angle * Math.PI / 180);        this.age += 1 / life;        this.boundary();    }}, {    key: 'shrink',    value: function shrink(life) {        this.dia = (1 - this.age) * this.diaSet;    }}, {    key: 'draw',    value: function draw() {        var ctx = this.canvas.getContext('2d'),            x = this.x,            y = this.y,            dia = this.dia,            age = this.age;        ctx.beginPath();        ctx.fillStyle = this.fill;        ctx.strokeStyle = this.fill;        ctx.lineWidth = 2;        ctx.arc(x, y, dia, 0, 2 * Math.PI);        ctx.closePath();        this.line !== true ? ctx.fill() : ctx.stroke();    }}]);return Point;
}();
var Particle = function () {
    function Particle() {
        _classCallCheck(this, Particle);
    }
_createClass(Particle, [{    key: 'setPosition',    value: function setPosition(x, y) {        this.x = x;        this.y = y;    }}, {    key: 'getPosition',    value: function getPosition(x, y) {        return {            x: this.x,            y: this.y        };    }}, {    key: 'spawn',    value: function spawn(x, y, amount, dia) {        var arr = [];        dia = dia || false;        amount = amount || 1;        if (amount > 1) {            for (var i = 0; i < amount; i++) {                if (dia) {                    arr.push(new Point(x, y, cvs, dia));                } else {                    arr.push(new Point(x, y, cvs));                }            }        } else {            arr = new Point(x, y, cvs, dia);        }        return arr;    }}]);return Particle;
}();
// Particle Emitter
var Emitter = function (_Particle) {
    _inherits(Emitter, _Particle);
function Emitter(x, y, life, mouse, dia) {    _classCallCheck(this, Emitter);    var _this = _possibleConstructorReturn(this, (Emitter.__proto__ || Object.getPrototypeOf(Emitter)).call(this));    if (mouse === undefined) {        _this.mouse = true;    } else {        _this.mouse = mouse;    }    _this.particles = [];    _this.x = x || 0;    _this.y = y || 0;    _this.life = life || 20;    _this.canvas = cvs;    _this.dia = dia || false;    return _this;}_createClass(Emitter, [{    key: 'animate',    value: function animate() {        var particles = this.particles;        if (this.mouse) {            this.setPosition(originx, originy);        }        var mul = 1;        for (var i = 0; i < mul; i++) {            particles.push(this.spawn(this.x, this.y, 1));        }        if (particles.length > this.life * mul) {            for (var _i = 0; _i < mul; _i++) {                particles.shift();            }        }        this.render(this.canvas);    }}, {    key: 'render',    value: function render() {        var life = this.life;        var ctx = this.canvas.getContext('2d');        var particles = this.particles;        for (var i = 0; i < particles.length; i++) {            var p = particles[i];            p.draw();            p.emit(this.life);            p.shrink();        }    }}]);return Emitter;
}(Particle);
// Particle Field
var Field = function (_Particle2) {
    _inherits(Field, _Particle2);
function Field(x, y, life) {    _classCallCheck(this, Field);    var _this2 = _possibleConstructorReturn(this, (Field.__proto__ || Object.getPrototypeOf(Field)).call(this));    _this2.particles = [];    _this2.canvas = cvs;    _this2.x = x || 0;    _this2.y = y || 0;    _this2.life = life;    for (var i = 0; i < _this2.life; i++) {        var _x = Math.random() * cvs.width,            _y = Math.random() * cvs.height;        _this2.particles.push(_this2.spawn(_x, _y, 1));    }    return _this2;}_createClass(Field, [{    key: 'animate',    value: function animate() {        this.render(canvas);    }}, {    key: 'render',    value: function render(canvas) {        var ctx = this.canvas.getContext('2d');        var particles = this.particles;        for (var i = 0; i < particles.length; i++) {            var p = particles[i];            p.draw();            p.field(this.life);        }    }}]);return Field;
}(Particle);
function getMousePos(cvs, evt) {
    var rect = cvs.getBoundingClientRect();
    return {
        x: evt.clientX - rect.left,
        y: evt.clientY - rect.top
    };
}
//
function animateCanvas(canvas, callback) {
var ctx = canvas.getContext('2d');ctx.clearRect(0, 0, canvas.width, canvas.height);callback();requestAnimationFrame(animateCanvas.bind(null, canvas, callback));
}
//Update canvas size to fill window
function resizeCanvas(canvas) {
    canvas.width = window.innerWidth;
    canvas.height = window.innerHeight;
    originx = canvas.width / 2;
    originy = canvas.height / 2;
}
init();</script>

找到当前WordPress主题目录下的footer.php文件，一般为/wp-content/themes/您的主题/,在<?php wp_footer();?>字段之前插入上述提取的代码，保存文件。刷新就可以看到效果啦。

大家有问题的话可以在下面留言哦，小哆啦看到第一时间为大家解答！赶快为你的站点添加您喜欢的背景效果吧~

,,,

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