https://quietdawn.github.io/js/star.js

1/*!
2 * Fairy Dust Cursor.js
3 * - 90's cursors collection
4 * -- https://github.com/tholman/90s-cursor-effects
5 * -- http://codepen.io/tholman/full/jWmZxZ/
6 */
7
8//鼠标点击雪花特效
9(function fairyDustCursor () {
10
11  var possibleColors = ["#D61C59", "#E7D84B", "#1B8798"]
12  var width = window.innerWidth;
13  var height = window.innerHeight;
14  var cursor = { x: width / 2, y: width / 2 };
15  var particles = [];
16
17  function init () {
18    bindEvents();
19    loop();
20  }
21
22  // Bind events that are needed
23  function bindEvents () {
24    document.addEventListener('mousemove', onMouseMove);
25    document.addEventListener('touchmove', onTouchMove);
26    document.addEventListener('touchstart', onTouchMove);
27
28    window.addEventListener('resize', onWindowResize);
29  }
30
31  function onWindowResize (e) {
32    width = window.innerWidth;
33    height = window.innerHeight;
34  }
35
36  function onTouchMove (e) {
37    if (e.touches.length > 0) {
38      for (var i = 0; i < e.touches.length; i++) {
39        addParticle(e.touches[i].clientX, e.touches[i].clientY, possibleColors[Math.floor(Math.random() * possibleColors.length)]);
40      }
41    }
42  }
43
44  function onMouseMove (e) {
45    cursor.x = e.clientX;
46    cursor.y = e.clientY;
47
48    addParticle(cursor.x, cursor.y, possibleColors[Math.floor(Math.random() * possibleColors.length)]);
49  }
50
51  function addParticle (x, y, color) {
52    var particle = new Particle();
53    particle.init(x, y, color);
54    particles.push(particle);
55  }
56
57  function updateParticles () {
58
59    // Updated
60    for (var i = 0; i < particles.length; i++) {
61      particles[i].update();
62    }
63
64    // Remove dead particles
65    for (var i = particles.length - 1; i >= 0; i--) {
66      if (particles[i].lifeSpan < 0) {
67        particles[i].die();
68        particles.splice(i, 1);
69      }
70    }
71
72  }
73
74  function loop () {
75    requestAnimationFrame(loop);
76    updateParticles();
77  }
78
79  /**
80   * Particles
81   */
82
83  function Particle () {
84
85    this.character = "*";
86    this.lifeSpan = 120; //ms
87    this.initialStyles = {
88      "position": "fixed",
89      "top": "0", //必须加
90      "display": "block",
91      "pointerEvents": "none",
92      "z-index": "10000000",
93      "fontSize": "20px",
94      "will-change": "transform"
95    };
96
97    // Init, and set properties
98    this.init = function (x, y, color) {
99
100      this.velocity = {
101        x: (Math.random() < 0.5 ? -1 : 1) * (Math.random() / 2),
102        y: 1
103      };
104
105      this.position = { x: x - 10, y: y - 20 };
106      this.initialStyles.color = color;
107      // console.log(color);
108
109      this.element = document.createElement('span');
110      this.element.innerHTML = this.character;
111      applyProperties(this.element, this.initialStyles);
112      this.update();
113
114      document.body.appendChild(this.element);
115    };
116
117    this.update = function () {
118      this.position.x += this.velocity.x;
119      this.position.y += this.velocity.y;
120      this.lifeSpan--;
121
122      this.element.style.transform = "translate3d(" + this.position.x + "px," + this.position.y + "px,0) scale(" + (this.lifeSpan / 120) + ")";
123    }
124
125    this.die = function () {
126      this.element.parentNode.removeChild(this.element);
127    }
128
129  }
130
131  /**
132   * Utils
133   */
134
135  // Applies css `properties` to an element.
136  function applyProperties (target, properties) {
137    for (var key in properties) {
138      target.style[key] = properties[key];
139    }
140  }
141
142  init();
143})();