vue--为网页添加动态响应背景

1、canvas-nest

　　这个应该是很常见的一个动态响应背景了，最后结果如下所示，是网上已有代码:在github上的开源代码

         

       方法一：通常使用js文件，如下。在html中可以直接导入js文件即可，在vue中也可以导入，但是这样导入的缺点是一旦导入，你所有页面的背景都将变成这个背景。

     

/**
 * Copyright (c) 2016 hustcc
 * License: MIT
 * Version: v1.0.1
 * GitHub: https://github.com/hustcc/canvas-nest.js
 **/
!
  function() {
    function n(n, e, t) {
      return n.getAttribute(e) || t
    }
    function e(n) {
      return document.getElementsByTagName(n)
    }
    function t() {
      var t = e("script"),
        o = t.length,
        i = t[o - 1];
      return {
        l: o,
        z: n(i, "zIndex", -1),
        o: n(i, "opacity", .5),
        c: n(i, "color", "0,0,0"),
        n: n(i, "count", 99)
      }
    }
    function o() {
      a = m.width = window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth,
        c = m.height = window.innerHeight || document.documentElement.clientHeight || document.body.clientHeight
    }
    function i() {
      r.clearRect(0, 0, a, c);
      var n, e, t, o, m, l;
      s.forEach(function(i, x) {
        for (i.x += i.xa, i.y += i.ya, i.xa *= i.x > a || i.x < 0 ? -1 : 1, i.ya *= i.y > c || i.y < 0 ? -1 : 1, r.fillRect(i.x - .5, i.y - .5, 1, 1), e = x + 1; e < u.length; e++) n = u[e],
        null !== n.x && null !== n.y && (o = i.x - n.x, m = i.y - n.y, l = o * o + m * m, l < n.max && (n === y && l >= n.max / 2 && (i.x -= .03 * o, i.y -= .03 * m), t = (n.max - l) / n.max, r.beginPath(), r.lineWidth = t / 2, r.strokeStyle = "rgba(" + d.c + "," + (t + .2) + ")", r.moveTo(i.x, i.y), r.lineTo(n.x, n.y), r.stroke()))
      }),
        x(i)
    }
    var a, c, u, m = document.createElement("canvas"),
      d = t(),
      l = "c_n" + d.l,
      r = m.getContext("2d"),
      x = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame ||
        function(n) {
          window.setTimeout(n, 1e3 / 45)
        },
      w = Math.random,
      y = {
        x: null,
        y: null,
        max: 2e4
      };
    m.id = l,
      m.style.cssText = "position:fixed;top:0;left:0;z-index:" + d.z + ";opacity:" + d.o,
      e("body")[0].appendChild(m),
      o(),
      window.onresize = o,
      window.onmousemove = function(n) {
        n = n || window.event,
          y.x = n.clientX,
          y.y = n.clientY
      },
      window.onmouseout = function() {
        y.x = null,
          y.y = null
      };
    for (var s = [], f = 0; d.n > f; f++) {
      var h = w() * a,
        g = w() * c,
        v = 2 * w() - 1,
        p = 2 * w() - 1;
      s.push({
        x: h,
        y: g,
        xa: v,
        ya: p,
        max: 6e3
      })
    }
    u = s.concat([y]),
      setTimeout(function() {
          i()
        },
        100)
  } ();

<script>
  import axios from 'axios/index'
  import {} from '../../static/lqbz/canvas-nest'
  export default {
    name: 'Home',
    data () {
      return {
      }
    },
    mounted(){//****在这里绑定监听器


    },
    methods: {


    }

  }
</script>

   方法二：如果你只是想将这个动态响应背景作为一个模块导入，也已经有提供，先如下进行安装。

  以上是一个错误示范，大概是将vue的一些用法忘了，需要进入到你的vue项目目录下再进行模块的安装。之后将vueCanvasNest作为一个模块来导入，使用。

<template>
  <div class="home">
    <vue-canvas-nest :config="{color:'255,0,0', count: 88}" :el="'#area'"> 
    </vue-canvas-nest>
    <div id="area">里面是背景上面的内容</div>
  </div>

</template>

<script>

  import axios from 'axios/index'
  import vueCanvasNest from 'vue-canvas-nest'
  export default {
    name: 'Home',
    components:{vueCanvasNest},
    data () {
      return {
      }
    },
    mounted(){//****在这里绑定监听器


    },
    methods: {


    }

  }
</script>

2、随鼠标滚动的动态星空背景

 

 

如上所示，点击会增加星星的数量，这个代码是在https://blog.csdn.net/black_pl/article/details/80244327中看到的，做了一点小小的更改，实现在vue中。由于不是自己的代码也懒得进行更深层次的封装，所以想要增加自定义的样式需要自己更改代码了。

js代码如下:

/*https://blog.csdn.net/black_pl/article/details/80244327*/
var num = 200;
var w = window.innerWidth;
var h = window.innerHeight;
var max = 100;
var _x = 0;
var _y = 0;
var _z = 150;
var dtr = function(d) {
  return d * Math.PI / 180;
};

var rnd = function() {
  return Math.sin(Math.floor(Math.random() * 360) * Math.PI / 180);
};
var dist = function(p1, p2, p3) {
  return Math.sqrt(Math.pow(p2.x - p1.x, 2) + Math.pow(p2.y - p1.y, 2) + Math.pow(p2.z - p1.z, 2));
};

var cam = {
  obj: {
    x: _x,
    y: _y,
    z: _z
  },
  dest: {
    x: 0,
    y: 0,
    z: 1
  },
  dist: {
    x: 0,
    y: 0,
    z: 200
  },
  ang: {
    cplane: 0,
    splane: 0,
    ctheta: 0,
    stheta: 0
  },
  zoom: 1,
  disp: {
    x: w / 2,
    y: h / 2,
    z: 0
  },
  upd: function() {
    cam.dist.x = cam.dest.x - cam.obj.x;
    cam.dist.y = cam.dest.y - cam.obj.y;
    cam.dist.z = cam.dest.z - cam.obj.z;
    cam.ang.cplane = -cam.dist.z / Math.sqrt(cam.dist.x * cam.dist.x + cam.dist.z * cam.dist.z);
    cam.ang.splane = cam.dist.x / Math.sqrt(cam.dist.x * cam.dist.x + cam.dist.z * cam.dist.z);
    cam.ang.ctheta = Math.sqrt(cam.dist.x * cam.dist.x + cam.dist.z * cam.dist.z) / Math.sqrt(cam.dist.x * cam.dist.x + cam.dist.y * cam.dist.y + cam.dist.z * cam.dist.z);
    cam.ang.stheta = -cam.dist.y / Math.sqrt(cam.dist.x * cam.dist.x + cam.dist.y * cam.dist.y + cam.dist.z * cam.dist.z);
  }
};

var trans = {
  parts: {
    sz: function(p, sz) {
      return {
        x: p.x * sz.x,
        y: p.y * sz.y,
        z: p.z * sz.z
      };
    },
    rot: {
      x: function(p, rot) {
        return {
          x: p.x,
          y: p.y * Math.cos(dtr(rot.x)) - p.z * Math.sin(dtr(rot.x)),
          z: p.y * Math.sin(dtr(rot.x)) + p.z * Math.cos(dtr(rot.x))
        };
      },
      y: function(p, rot) {
        return {
          x: p.x * Math.cos(dtr(rot.y)) + p.z * Math.sin(dtr(rot.y)),
          y: p.y,
          z: -p.x * Math.sin(dtr(rot.y)) + p.z * Math.cos(dtr(rot.y))
        };
      },
      z: function(p, rot) {
        return {
          x: p.x * Math.cos(dtr(rot.z)) - p.y * Math.sin(dtr(rot.z)),
          y: p.x * Math.sin(dtr(rot.z)) + p.y * Math.cos(dtr(rot.z)),
          z: p.z
        };
      }
    },
    pos: function(p, pos) {
      return {
        x: p.x + pos.x,
        y: p.y + pos.y,
        z: p.z + pos.z
      };
    }
  },
  pov: {
    plane: function(p) {
      return {
        x: p.x * cam.ang.cplane + p.z * cam.ang.splane,
        y: p.y,
        z: p.x * -cam.ang.splane + p.z * cam.ang.cplane
      };
    },
    theta: function(p) {
      return {
        x: p.x,
        y: p.y * cam.ang.ctheta - p.z * cam.ang.stheta,
        z: p.y * cam.ang.stheta + p.z * cam.ang.ctheta
      };
    },
    set: function(p) {
      return {
        x: p.x - cam.obj.x,
        y: p.y - cam.obj.y,
        z: p.z - cam.obj.z
      };
    }
  },
  persp: function(p) {
    return {
      x: p.x * cam.dist.z / p.z * cam.zoom,
      y: p.y * cam.dist.z / p.z * cam.zoom,
      z: p.z * cam.zoom,
      p: cam.dist.z / p.z
    };
  },
  disp: function(p, disp) {
    return {
      x: p.x + disp.x,
      y: -p.y + disp.y,
      z: p.z + disp.z,
      p: p.p
    };
  },
  steps: function(_obj_, sz, rot, pos, disp) {
    var _args = trans.parts.sz(_obj_, sz);
    _args = trans.parts.rot.x(_args, rot);
    _args = trans.parts.rot.y(_args, rot);
    _args = trans.parts.rot.z(_args, rot);
    _args = trans.parts.pos(_args, pos);
    _args = trans.pov.plane(_args);
    _args = trans.pov.theta(_args);
    _args = trans.pov.set(_args);
    _args = trans.persp(_args);
    _args = trans.disp(_args, disp);
    return _args;
  }
};

function stars_nest() {
  "use strict";
  var threeD = function(param) {
    this.transIn = {};
    this.transOut = {};
    this.transIn.vtx = (param.vtx);
    this.transIn.sz = (param.sz);
    this.transIn.rot = (param.rot);
    this.transIn.pos = (param.pos);
  };

  threeD.prototype.vupd = function() {
    this.transOut = trans.steps(

      this.transIn.vtx,
      this.transIn.sz,
      this.transIn.rot,
      this.transIn.pos,
      cam.disp
    );
  };

  var Build = function() {
    this.vel = 0.04;
    this.lim = 360;
    this.diff = 200;
    this.initPos = 100;
    this.toX = _x;
    this.toY = _y;
    this.go();
  };

  Build.prototype.go = function() {
    this.canvas = document.getElementById("canv");
    this.canvas.width = window.innerWidth;
    this.canvas.height = window.innerHeight;
    this.$ = canv.getContext("2d");
    this.$.globalCompositeOperation = 'source-over';
    this.varr = [];
    this.dist = [];
    this.calc = [];

    for (var i = 0, len = num; i < len; i++) {
      this.add();
    }

    this.rotObj = {
      x: 0,
      y: 0,
      z: 0
    };
    this.objSz = {
      x: w / 5,
      y: h / 5,
      z: w / 5
    };
  };

  Build.prototype.add = function() {
    this.varr.push(new threeD({
      vtx: {
        x: rnd(),
        y: rnd(),
        z: rnd()
      },
      sz: {
        x: 0,
        y: 0,
        z: 0
      },
      rot: {
        x: 20,
        y: -20,
        z: 0
      },
      pos: {
        x: this.diff * Math.sin(360 * Math.random() * Math.PI / 180),
        y: this.diff * Math.sin(360 * Math.random() * Math.PI / 180),
        z: this.diff * Math.sin(360 * Math.random() * Math.PI / 180)
      }
    }));
    this.calc.push({
      x: 360 * Math.random(),
      y: 360 * Math.random(),
      z: 360 * Math.random()
    });
  };

  Build.prototype.upd = function() {
    cam.obj.x += (this.toX - cam.obj.x) * 0.05;
    cam.obj.y += (this.toY - cam.obj.y) * 0.05;
  };

  Build.prototype.draw = function() {
    this.$.clearRect(0, 0, this.canvas.width, this.canvas.height);
    cam.upd();
    this.rotObj.x += 0.1;
    this.rotObj.y += 0.1;
    this.rotObj.z += 0.1;

    for (var i = 0; i < this.varr.length; i++) {
      for (var val in this.calc[i]) {
        if (this.calc[i].hasOwnProperty(val)) {
          this.calc[i][val] += this.vel;
          if (this.calc[i][val] > this.lim) this.calc[i][val] = 0;
        }
      }

      this.varr[i].transIn.pos = {
        x: this.diff * Math.cos(this.calc[i].x * Math.PI / 180),
        y: this.diff * Math.sin(this.calc[i].y * Math.PI / 180),
        z: this.diff * Math.sin(this.calc[i].z * Math.PI / 180)
      };
      this.varr[i].transIn.rot = this.rotObj;
      this.varr[i].transIn.sz = this.objSz;
      this.varr[i].vupd();
      if (this.varr[i].transOut.p < 0) continue;
      var g = this.$.createRadialGradient(this.varr[i].transOut.x, this.varr[i].transOut.y, this.varr[i].transOut.p, this.varr[i].transOut.x, this.varr[i].transOut.y, this.varr[i].transOut.p * 2);
      this.$.globalCompositeOperation = 'lighter';
      g.addColorStop(0, 'hsla(255, 255%, 255%, 1)');
      g.addColorStop(.5, 'hsla(' + (i + 2) + ',85%, 40%,1)');
      g.addColorStop(1, 'hsla(' + (i) + ',85%, 40%,.5)');
      this.$.fillStyle = g;
      this.$.beginPath();
      this.$.arc(this.varr[i].transOut.x, this.varr[i].transOut.y, this.varr[i].transOut.p * 2, 0, Math.PI * 2, false);
      this.$.fill();
      this.$.closePath();
    }
  };
  Build.prototype.anim = function() {
    window.requestAnimationFrame = (function() {
      return window.requestAnimationFrame ||
        function(callback, element) {
          window.setTimeout(callback, 1000 / 60);
        };
    })();
    var anim = function() {
      this.upd();
      this.draw();
      window.requestAnimationFrame(anim);
    }.bind(this);
    window.requestAnimationFrame(anim);
  };

  Build.prototype.run = function() {
    this.anim();

    window.addEventListener('mousemove', function(e) {
      this.toX = (e.clientX - this.canvas.width / 2) * -0.8;
      this.toY = (e.clientY - this.canvas.height / 2) * 0.8;
    }.bind(this));
    window.addEventListener('touchmove', function(e) {
      e.preventDefault();
      this.toX = (e.touches[0].clientX - this.canvas.width / 2) * -0.8;
      this.toY = (e.touches[0].clientY - this.canvas.height / 2) * 0.8;
    }.bind(this));
    window.addEventListener('mousedown', function(e) {
      for (var i = 0; i < 100; i++) {
        this.add();
      }
    }.bind(this));
    window.addEventListener('touchstart', function(e) {
      e.preventDefault();
      for (var i = 0; i < 100; i++) {
        this.add();
      }
    }.bind(this));

  };
  var app = new Build();
  app.run();
  window.addEventListener('resize', function() {
    //alert(w);
    var mycanvas = document.getElementById("canv");
    w = window.innerWidth;
    h = window.innerHeight;

    mycanvas.setAttribute("width",w);
    mycanvas.setAttribute("height",h);
  }, false);
}

export {
  stars_nest
}

在vue中的使用:

<template>
  <div class="home">
    <canvas id="canv"></canvas>
  </div>

</template>

<script>

  import {stars_nest} from '../../static/lqbz/stars-nest'

  export default {
    name: 'Home',
    data () {
      return {
      }
    },
    mounted(){//****在这里绑定监听器
      stars_nest();

    },
    methods: {


    }

  }
</script>
<style>
  html {
    height: 100%;
    background-image: -webkit-radial-gradient(ellipse farthest-corner at center top, #000d4d 0%, #000105 100%);
    background-image: radial-gradient(ellipse farthest-corner at center top, #000d4d 0%, #000105 100%);
    cursor: arrow;
  }

  body {
    width: 100%;
    margin: 0;
    overflow: hidden;
  }

</style>