js效果代码

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HTML代码:

<html><head>    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">    <meta http-equiv="Content-Language" content="zh-CN">    <meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no">    <meta name="keywords" content="">    <meta name="Description" content="">    <meta name="Author" content="">    <title>js效果代码</title>  <script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script></head><body class="  pace-done"><div class="blog-body"><canvas id="canvas-banner" style="background: #393D49; " width="1256" height="308"></canvas><script type="text/javascript">    var canvas = document.getElementById('canvas-banner');    canvas.width = window.document.body.clientWidth;    canvas.height = window.innerHeight * 2 / 7;    window.onload = function () {        var script = document.createElement('script');        script.src = './static/homeindex.js';        document.getElementsByTagName('body')[0].appendChild(script);    }</script></div><script src="./static/homeindex.js"></script></body></html>

JS代码:

$(function () {        DrawCanvas();    });    function DrawCanvas() {        var canvas = document.getElementById('canvas-banner');        var ctx = canvas.getContext('2d');        ctx.strokeStyle = (new Color(150)).style;        var screenWidth = screen.width;        canvas.width = window.document.body.clientWidth;        canvas.height = window.innerHeight * 2 / 7;        var dotCount = 20;        var dotRadius = 70;        var dotDistance = 70;        if (screenWidth >= 768 && screenWidth < 992) {            dotCount = 170;            dotRadius = 90;            dotDistance = 60;            canvas.height = window.innerHeight / 3;        } else if (screenWidth >= 992 && screenWidth < 1200) {            dotCount = 120;            dotRadius = 140;            dotDistance = 70;            canvas.height = window.innerHeight * 1 / 3;        } else if (screenWidth >= 1200 && screenWidth < 1700) {            dotCount = 140;            dotRadius = 150;            dotDistance = 80;            canvas.height = window.innerHeight * 1 / 3;        } else if (screenWidth >= 1700) {            dotCount = 200;            dotRadius = 150;            dotDistance = 80;            canvas.height = window.innerHeight * 1 / 3;        }        var mousePosition = {            x: 50 * canvas.width / 100,            y: 50 * canvas.height / 100        };        var dots = {            count: dotCount,            distance: dotDistance,            d_radius: dotRadius,            array: []        };        function colorValue(min) {            return Math.floor(Math.random() * 255 + min);        }        function createColorStyle(r, g, b) {            return 'rgba(' + r + ',' + g + ',' + b + ', 0.8)';        }        function mixComponents(comp1, weight1, comp2, weight2) {            return (comp1 * weight1 + comp2 * weight2) / (weight1 + weight2);        }        function averageColorStyles(dot1, dot2) {            var color1 = dot1.color,                color2 = dot2.color;            var r = mixComponents(color1.r, dot1.radius, color2.r, dot2.radius),                g = mixComponents(color1.g, dot1.radius, color2.g, dot2.radius),                b = mixComponents(color1.b, dot1.radius, color2.b, dot2.radius);            return createColorStyle(Math.floor(r), Math.floor(g), Math.floor(b));        }        function Color(min) {            min = min || 0;            this.r = colorValue(min);            this.g = colorValue(min);            this.b = colorValue(min);            this.style = createColorStyle(this.r, this.g, this.b);        }        function Dot() {            this.x = Math.random() * canvas.width;            this.y = Math.random() * canvas.height;            this.vx = -.5 + Math.random();            this.vy = -.5 + Math.random();            this.radius = Math.random() * 2;            this.color = new Color();        }        Dot.prototype = {            draw: function () {                ctx.beginPath();                ctx.fillStyle = "#fff";                ctx.arc(this.x, this.y, this.radius, 0, Math.PI * 2, false);                ctx.fill();            }        };        function createDots() {            for (i = 0; i < dots.count; i++) {                dots.array.push(new Dot());            }        }        function moveDots() {            for (i = 0; i < dots.count; i++) {                var dot = dots.array[i];                if (dot.y < 0 || dot.y > canvas.height) {                    dot.vx = dot.vx;                    dot.vy = -dot.vy;                }                else if (dot.x < 0 || dot.x > canvas.width) {                    dot.vx = -dot.vx;                    dot.vy = dot.vy;                }                dot.x += dot.vx;                dot.y += dot.vy;            }        }        function connectDots1() {            var pointx = mousePosition.x;            for (i = 0; i < dots.count; i++) {                for (j = 0; j < dots.count; j++) {                    i_dot = dots.array[i];                    j_dot = dots.array[j];                    if ((i_dot.x - j_dot.x) < dots.distance && (i_dot.y - j_dot.y) < dots.distance && (i_dot.x - j_dot.x) > -dots.distance && (i_dot.y - j_dot.y) > -dots.distance) {                        if ((i_dot.x - pointx) < dots.d_radius && (i_dot.y - mousePosition.y) < dots.d_radius && (i_dot.x - pointx) > -dots.d_radius && (i_dot.y - mousePosition.y) > -dots.d_radius) {                            ctx.beginPath();                            ctx.strokeStyle = averageColorStyles(i_dot, j_dot);                            ctx.moveTo(i_dot.x, i_dot.y);                            ctx.lineTo(j_dot.x, j_dot.y);                            ctx.stroke();                            ctx.closePath();                        }                    }                }            }        }        function drawDots() {            for (i = 0; i < dots.count; i++) {                var dot = dots.array[i];                dot.draw();            }        }        function animateDots() {            ctx.clearRect(0, 0, canvas.width, canvas.height);            moveDots();            connectDots1()            drawDots();            requestAnimationFrame(animateDots);        }        $('canvas').on('mousemove', function (e) {            mousePosition.x = e.pageX;            mousePosition.y = e.pageY;        });        $('canvas').on('mouseleave', function (e) {            mousePosition.x = canvas.width / 2;            mousePosition.y = canvas.height / 2;        });        createDots();        requestAnimationFrame(animateDots);    }

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