可视化添加canvas背景

src/pages/screen/list/index.vue

@@ -1,5 +1,6 @@
 <template>
   <div class="wrap">
+    <canvas class="canvas" id="canvas"></canvas>
     <!-- 全屏 -->
     <img class="full" src="@/assets/img/screen/full.png" alt="" @click="fullScreen">
     <!--header-->
@@ -307,6 +308,7 @@ import util from '@/libs/util'
 import * as echarts from 'echarts'
 import SockJS from 'sockjs-client'
 import Stomp from 'stompjs'
+// import '@/plugins/canvasBg'
 export default {
     data() {
         return {
@@ -320,6 +322,7 @@ export default {
       // this.getCrypto()
       this.connect()
       this.renderChart()
+      require('@/plugins/canvasBg') // 加载canvas背景js
     },
     methods: {
       // 获取加密货币实时行情

src/plugins/canvasBg/index.js

@@ -0,0 +1,102 @@
+//宇宙特效
+var canvas = document.querySelector('#canvas'),
+  ctx = canvas.getContext('2d'),
+  w = canvas.width = window.innerWidth,
+  h = canvas.height = window.innerHeight,
+
+  hue = 217,
+  stars = [],
+  count = 0,
+  maxStars = 1300;//星星数量
+
+var canvas2 = document.createElement('canvas'),
+  ctx2 = canvas2.getContext('2d');
+canvas2.width = 100;
+canvas2.height = 100;
+var half = canvas2.width / 2,
+  gradient2 = ctx2.createRadialGradient(half, half, 0, half, half, half);
+gradient2.addColorStop(0.025, '#CCC');
+gradient2.addColorStop(0.1, 'hsl(' + hue + ', 61%, 33%)');
+gradient2.addColorStop(0.25, 'hsl(' + hue + ', 64%, 6%)');
+gradient2.addColorStop(1, 'transparent');
+
+ctx2.fillStyle = gradient2;
+ctx2.beginPath();
+ctx2.arc(half, half, half, 0, Math.PI * 2);
+ctx2.fill();
+
+// End cache
+
+function random(min, max) {
+  if (arguments.length < 2) {
+    max = min;
+    min = 0;
+  }
+
+  if (min > max) {
+    var hold = max;
+    max = min;
+    min = hold;
+  }
+
+  return Math.floor(Math.random() * (max - min + 1)) + min;
+}
+
+function maxOrbit(x, y) {
+  var max = Math.max(x, y),
+    diameter = Math.round(Math.sqrt(max * max + max * max));
+  return diameter / 2;
+  //星星移动范围，值越大范围越小，
+}
+
+var Star = function() {
+
+  this.orbitRadius = random(maxOrbit(w, h));
+  this.radius = random(60, this.orbitRadius) / 8; 
+  //星星大小
+  this.orbitX = w / 2;
+  this.orbitY = h / 2;
+  this.timePassed = random(0, maxStars);
+  this.speed = random(this.orbitRadius) / 1000000; 
+  //星星移动速度
+  this.alpha = random(2, 10)/1000;
+
+  count++;
+  stars[count] = this;
+}
+
+Star.prototype.draw = function() {
+  var x = Math.sin(this.timePassed) * this.orbitRadius + this.orbitX,
+    y = Math.cos(this.timePassed) * this.orbitRadius + this.orbitY,
+    twinkle = random(10);
+
+  if (twinkle === 1 && this.alpha > 0) {
+    this.alpha -= 0.05;
+  } else if (twinkle === 2 && this.alpha < 1) {
+    this.alpha += 0.05;
+  }
+
+  ctx.globalAlpha = this.alpha;
+  ctx.drawImage(canvas2, x - this.radius / 2, y - this.radius / 2, this.radius, this.radius);
+  this.timePassed += this.speed;
+}
+
+for (var i = 0; i < maxStars; i++) {
+  new Star();
+}
+
+function animation() {
+  ctx.globalCompositeOperation = 'source-over';
+  ctx.globalAlpha = 0.5; //尾巴
+  ctx.fillStyle = 'hsla(' + hue + ', 64%, 6%, 2)';
+  ctx.fillRect(0, 0, w, h)
+
+  ctx.globalCompositeOperation = 'lighter';
+  for (var i = 1, l = stars.length; i < l; i++) {
+    stars[i].draw();
+  };
+
+  window.requestAnimationFrame(animation);
+}
+
+animation();

src/styles/page/screen.scss

@@ -1,6 +1,15 @@
 ::-webkit-scrollbar-thumb {
   display: none;
 }
+.canvas {
+  z-index: 0;
+  position: fixed;
+  top: 0;
+  left: 0;
+  width: 100%;
+  height: 100%;
+  opacity: .7;
+}
 .wrap {
   width: 100%;
   height: auto;
@@ -64,6 +73,8 @@
 }
 /*header开始*/
 .header{
+    z-index: 2;
+    position: relative;
     width: 100%;
     height: 80px;
     padding:0 20px;