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  • 背景代码磁力小棍棍JS代码

    未分类 panda 318次浏览 已收录 0个评论
    <script>
    ! function() {
    function get_attribute(node, attr, default_value) {
    return node.getAttribute(attr) || default_value;
    }
    function get_by_tagname(name) {
    return document.getElementsByTagName(name);
    }
    //获取配置参数
    function get_config_option() {
    var scripts = get_by_tagname("script"),
    script_len = scripts.length,
    script = scripts[script_len - 1]; //当前加载的script
    return {
    l: script_len, //长度,用于生成id用
    z: get_attribute(script, "zIndex", -1), //z-index
    o: get_attribute(script, "opacity", 0.5), //opacity
    c: get_attribute(script, "color", "0,0,0"), //color
    n: get_attribute(script, "count", 99) //count
    };
    }
    //设置canvas的高宽
    function set_canvas_size() {
    canvas_width = the_canvas.width = window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth, 
    canvas_height = the_canvas.height = window.innerHeight || document.documentElement.clientHeight || document.body.clientHeight;
    }
     
    //绘制过程
    function draw_canvas() {
    context.clearRect(0, 0, canvas_width, canvas_height);
    //随机的线条和当前位置联合数组
    var e, i, d, x_dist, y_dist, dist; //临时节点
    //遍历处理每一个点
    random_lines.forEach(function(r, idx) {
    r.x += r.xa, 
    r.y += r.ya, //移动
    r.xa *= r.x > canvas_width || r.x < 0 ? -1 : 1, r.ya *= r.y > canvas_height || r.y < 0 ? -1 : 1, //碰到边界,反向反弹
    context.fillRect(r.x - 0.5, r.y - 0.5, 1, 1); //绘制一个宽高为1的点
    //从下一个点开始
    for (i = idx + 1; i < all_array.length; i++) {
    e = all_array[i];
    //不是当前点
    if (null !== e.x && null !== e.y) {
    x_dist = r.x - e.x, //x轴距离 l
    y_dist = r.y - e.y, //y轴距离 n
    dist = x_dist * x_dist + y_dist * y_dist; //总距离, m
    dist < e.max && (e === current_point && dist >= e.max / 2 && (r.x -= 0.03 * x_dist, r.y -= 0.03 * y_dist), //靠近的时候加速
    d = (e.max - dist) / e.max, 
    context.beginPath(), 
    context.lineWidth = d / 2, 
    context.strokeStyle = "rgba(" + config.c + "," + (d + 0.2) + ")", 
    context.moveTo(r.x, r.y), 
    context.lineTo(e.x, e.y), 
    context.stroke());
    }
    }
    }), frame_func(draw_canvas);
    }
    //创建画布,并添加到body中
    var the_canvas = document.createElement("canvas"), //画布
    config = get_config_option(), //配置
    canvas_id = "c_n" + config.l, //canvas id
    context = the_canvas.getContext("2d"), canvas_width, canvas_height, 
    frame_func = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame || function(func) {
    window.setTimeout(func, 1000 / 45);
    }, random = Math.random, 
    current_point = {
    x: null, //当前鼠标x
    y: null, //当前鼠标y
    max: 20000
    },
    all_array;
    the_canvas.id = canvas_id;
    the_canvas.style.cssText = "position:fixed;top:0;left:0;z-index:" + config.z + ";opacity:" + config.o;
    get_by_tagname("body")[0].appendChild(the_canvas);
    //初始化画布大小
     
    set_canvas_size(), window.onresize = set_canvas_size;
    //当时鼠标位置存储,离开的时候,释放当前位置信息
    window.onmousemove = function(e) {
    e = e || window.event, current_point.x = e.clientX, current_point.y = e.clientY;
    }, window.onmouseout = function() {
    current_point.x = null, current_point.y = null;
    };
    //随机生成config.n条线位置信息
    for (var random_lines = [], i = 0; config.n > i; i++) {
    var x = random() * canvas_width, //随机位置
    y = random() * canvas_height,
    xa = 2 * random() - 1, //随机运动方向
    ya = 2 * random() - 1;
    random_lines.push({
    x: x,
    y: y,
    xa: xa,
    ya: ya,
    max: 6000 //沾附距离
    });
    }
    all_array = random_lines.concat([current_point]);
    //0.1秒后绘制
    setTimeout(function() {
    draw_canvas();
    }, 100);
    }();
    </script>
    
    
    
    知乎背景
    <style type="text/css">
                body {
                    text-align: center;
                    background: #F7FAFC;
                    overflow: hidden;
                    background: #fff;
                }
            </style>
     
      
            <canvas id="Mycanvas"></canvas>
            <script>
                //定义画布宽高和生成点的个数
                var WIDTH = window.innerWidth,
                    HEIGHT = window.innerHeight,
                    POINT = 35;
    
                var canvas = document.getElementById('Mycanvas');
                canvas.width = WIDTH,
                    canvas.height = HEIGHT;
                var context = canvas.getContext('2d');
                context.strokeStyle = 'rgba(0,0,0,0.2)',
                    context.strokeWidth = 1,
                    context.fillStyle = 'rgba(0,0,0,0.1)';
                var circleArr = [];
    
                //线条:开始xy坐标,结束xy坐标,线条透明度
                function Line(x, y, _x, _y, o) {
                    this.beginX = x,
                        this.beginY = y,
                        this.closeX = _x,
                        this.closeY = _y,
                        this.o = o;
                }
                //点:圆心xy坐标,半径,每帧移动xy的距离
                function Circle(x, y, r, moveX, moveY) {
                    this.x = x,
                        this.y = y,
                        this.r = r,
                        this.moveX = moveX,
                        this.moveY = moveY;
                }
                //生成max和min之间的随机数
                function num(max, _min) {
                    var min = arguments[1] || 0;
                    return Math.floor(Math.random() * (max - min + 1) + min);
                }
                // 绘制原点
                function drawCricle(cxt, x, y, r, moveX, moveY) {
                    var circle = new Circle(x, y, r, moveX, moveY)
                    cxt.beginPath()
                    cxt.arc(circle.x, circle.y, circle.r, 0, 2 * Math.PI)
                    cxt.closePath()
                    cxt.fill();
                    return circle;
                }
                //绘制线条
                function drawLine(cxt, x, y, _x, _y, o) {
                    var line = new Line(x, y, _x, _y, o)
                    cxt.beginPath()
                    cxt.strokeStyle = 'rgba(0,0,0,' + o + ')'
                    cxt.moveTo(line.beginX, line.beginY)
                    cxt.lineTo(line.closeX, line.closeY)
                    cxt.closePath()
                    cxt.stroke();
    
                }
                //每帧绘制
                function draw() {
                    context.clearRect(0, 0, canvas.width, canvas.height);
                    for(var i = 0; i < POINT; i++) {
                        drawCricle(context, circleArr[i].x, circleArr[i].y, circleArr[i].r);
                    }
                    for(var i = 0; i < POINT; i++) {
                        for(var j = 0; j < POINT; j++) {
                            if(i + j < POINT) { var A = Math.abs(circleArr[i + j].x - circleArr[i].x), B = Math.abs(circleArr[i + j].y - circleArr[i].y); var lineLength = Math.sqrt(A * A + B * B); var C = 1 / lineLength * 7 - 0.009; var lineOpacity = C > 0.03 ? 0.03 : C;
                                if(lineOpacity > 0) {
                                    drawLine(context, circleArr[i].x, circleArr[i].y, circleArr[i + j].x, circleArr[i + j].y, lineOpacity);
                                }
                            }
                        }
                    }
                }
                //初始化生成原点
                function init() {
                    circleArr = [];
                    for(var i = 0; i < POINT; i++) {
                        circleArr.push(drawCricle(context, num(WIDTH), num(HEIGHT), num(15, 2), num(10, -10) / 40, num(10, -10) / 40));
                    }
                    draw();
                }
                //调用执行
                window.onload = function() {
                    init();
                    setInterval(function() {
                        for(var i = 0; i < POINT; i++) { var cir = circleArr[i]; cir.x += cir.moveX; cir.y += cir.moveY; if(cir.x > WIDTH) cir.x = 0;
                            else if(cir.x < 0) cir.x = WIDTH; if(cir.y > HEIGHT) cir.y = 0;
                            else if(cir.y < 0) cir.y = HEIGHT;
                        }
                        draw();
                    }, 10);
                }
            </script>
        
    
    
    

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