第一种点线特效

根据 网上大佬Next主题的教程，修改Chic主题（https://asdfv1929.github.io/2018/07/07/next-add-dynamicbg/）

  • 添加js文件 dynamic.js

    ..\themes\Chic\source\js 路径下添加

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    var canvas = document.getElementById("canvas");
    var ctx = canvas.getContext("2d");
    var cw = canvas.width = window.innerWidth,
      cx = cw / 2;
    var ch = canvas.height = window.innerHeight,
      cy = ch / 2;

    ctx.fillStyle = "#000";
    var linesNum = 16;
    var linesRy = [];
    var requestId = null;

    function Line(flag) {
      this.flag = flag;
      this.a = {};
      this.b = {};
      if (flag == "v") {
        this.a.y = 0;
        this.b.y = ch;
        this.a.x = randomIntFromInterval(0, ch);
        this.b.x = randomIntFromInterval(0, ch);
      } else if (flag == "h") {
        this.a.x = 0;
        this.b.x = cw;
        this.a.y = randomIntFromInterval(0, cw);
        this.b.y = randomIntFromInterval(0, cw);
      }
      this.va = randomIntFromInterval(25, 100) / 100;
      this.vb = randomIntFromInterval(25, 100) / 100;

      this.draw = function() {
        ctx.strokeStyle = "#ccc";
        ctx.beginPath();
        ctx.moveTo(this.a.x, this.a.y);
        ctx.lineTo(this.b.x, this.b.y);
        ctx.stroke();
      }

      this.update = function() {
        if (this.flag == "v") {
          this.a.x += this.va;
          this.b.x += this.vb;
        } else if (flag == "h") {
          this.a.y += this.va;
          this.b.y += this.vb;
        }

        this.edges();
      }

      this.edges = function() {
        if (this.flag == "v") {
          if (this.a.x < 0 || this.a.x > cw) {
            this.va *= -1;
          }
          if (this.b.x < 0 || this.b.x > cw) {
            this.vb *= -1;
          }
        } else if (flag == "h") {
          if (this.a.y < 0 || this.a.y > ch) {
            this.va *= -1;
          }
          if (this.b.y < 0 || this.b.y > ch) {
            this.vb *= -1;
          }
        }
      }

    }

    for (var i = 0; i < linesNum; i++) {
      var flag = i % 2 == 0 ? "h" : "v";
      var l = new Line(flag);
      linesRy.push(l);
    }

    function Draw() {
      requestId = window.requestAnimationFrame(Draw);
      ctx.clearRect(0, 0, cw, ch);

      for (var i = 0; i < linesRy.length; i++) {
        var l = linesRy[i];
        l.draw();
        l.update();
      }
      for (var i = 0; i < linesRy.length; i++) {
        var l = linesRy[i];
        for (var j = i + 1; j < linesRy.length; j++) {
          var l1 = linesRy[j]
          Intersect2lines(l, l1);
        }
      }
    }

    function Init() {
      linesRy.length = 0;
      for (var i = 0; i < linesNum; i++) {
        var flag = i % 2 == 0 ? "h" : "v";
        var l = new Line(flag);
        linesRy.push(l);
      }

      if (requestId) {
        window.cancelAnimationFrame(requestId);
        requestId = null;
      }

      cw = canvas.width = window.innerWidth,
        cx = cw / 2;
      ch = canvas.height = window.innerHeight,
        cy = ch / 2;

      Draw();
    };

    setTimeout(function() {
      Init();

      addEventListener('resize', Init, false);
    }, 15);

    function Intersect2lines(l1, l2) {
      var p1 = l1.a,
        p2 = l1.b,
        p3 = l2.a,
        p4 = l2.b;
      var denominator = (p4.y - p3.y) * (p2.x - p1.x) - (p4.x - p3.x) * (p2.y - p1.y);
      var ua = ((p4.x - p3.x) * (p1.y - p3.y) - (p4.y - p3.y) * (p1.x - p3.x)) / denominator;
      var ub = ((p2.x - p1.x) * (p1.y - p3.y) - (p2.y - p1.y) * (p1.x - p3.x)) / denominator;
      var x = p1.x + ua * (p2.x - p1.x);
      var y = p1.y + ua * (p2.y - p1.y);
      if (ua > 0 && ub > 0) {
        markPoint({
          x: x,
          y: y
        })
      }
    }

    function markPoint(p) {
      ctx.beginPath();
      ctx.arc(p.x, p.y, 2, 0, 2 * Math.PI);
      ctx.fill();
    }

    function randomIntFromInterval(mn, mx) {
      return ~~(Math.random() * (mx - mn + 1) + mn);
    }

  • 添加dynamic.ejs文件 ..\themes\Chic\layout\_partial\dynamic.ejs

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    <script type="text/javascript" src="/blog/js/dynamic.js"></script>

    注：src中的blog是根据路径添加的

  • 修改页面显示配置文件 ..\themes\Chic\layout\layout.ejs

    • body里添加
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    <div class="bg_content">    <canvas id="canvas"></canvas></div>
    • body外下面添加(写在head里面会报错)
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    <%- partial('_partial/dynamic',{cache: true}) %>

第二种点线特效

  • 添加pointline.ejs文件 ..\themes\Chic\layout\_partial\pointline.ejs

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    <script type="text/javascript"color="0,0,0" opacity='0.2' zIndex="-2" count="120" src="//cdn.bootcss.com/canvas-nest.js/1.0.0/canvas-nest.min.js"></script>

    注：color-设置颜色 opacity-设置透明度 zIndex-设置堆叠顺序 count-设置线的数量

  • 修改页面显示配置文件 ..\themes\Chic\layout\layout.ejs

    注：须在body下外面添加，不然报错

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    <%- partial('_partial/pointline',{cache: true}) %>

  • 重新清理启动