control/login/loginbg.js

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//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('bgCanvas');
canvas.width = WIDTH,
    canvas.height = HEIGHT;
var context = canvas.getContext('2d');
context.strokeStyle = 'rgba(255,255,255,0.5)',
    context.strokeWidth = 1,
    context.fillStyle = 'rgba(255,255,255,0.2)';
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(255,255,255,'+ o +')'
    cxt.moveTo(line.beginX, line.beginY)
    cxt.lineTo(line.closeX, line.closeY)
    cxt.closePath()
    cxt.stroke();

}
//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));
    }