纯js实现页面点击爆炸效果_五颜六色特效

sheep

纯js实现页面点击爆炸效果 - 鼠标点击爆炸五颜六色特效，长按鼠标会大爆炸，以下js直接放h5页面中即可，调整小球颜色大小及速度等都已注释，方便修改，效果可在本页面直接预览

- sheep论坛

1. <!-- 鼠标点击爆炸五颜六色特效 - sheep - 20220330 -->
   
2. <script type="text/javascript">
   
3. function clickEffect() {
   
4.   let balls = [];
   
5.   let longPressed = false;
   
6.   let longPress;
   
7.   let multiplier = 0;
   
8.   let width, height;
   
9.   let origin;
   
10.   let normal;
    
11.   let ctx;
    
12.   //小球颜色
    
13.   const colours = ["#F73859", "#14FFEC", "#00E0FF", "#FF99FE", "#FAF15D"];
    
14.   const canvas = document.createElement("canvas");
    
15.   document.body.appendChild(canvas);
    
16.   canvas.setAttribute("style", "width: 100%; height: 100%; top: 0; left: 0; z-index: 99999; position: fixed; pointer-events: none;");
    
17.   const pointer = document.createElement("span");
    
18.   pointer.classList.add("pointer");
    
19.   document.body.appendChild(pointer);
    
20. 
    
21.   if (canvas.getContext && window.addEventListener) {
    
22.     ctx = canvas.getContext("2d");
    
23.     updateSize();
    
24.     window.addEventListener('resize', updateSize, false);
    
25.     loop();
    
26.     window.addEventListener("mousedown", function(e) {
    
27.       pushBalls(randBetween(5, 10), e.clientX, e.clientY);
    
28.       document.body.classList.add("is-pressed");
    
29.       longPress = setTimeout(function() {
    
30.         document.body.classList.add("is-longpress");
    
31.         longPressed = true;
    
32.       }, 500);
    
33.     }, false);
    
34.     window.addEventListener("mouseup", function(e) {
    
35.       clearInterval(longPress);
    
36.       if (longPressed == true) {
    
37.         document.body.classList.remove("is-longpress");
    
38.         pushBalls(randBetween(50 + Math.ceil(multiplier), 100 + Math.ceil(multiplier)), e.clientX, e.clientY);
    
39.         longPressed = false;
    
40.       }
    
41.       document.body.classList.remove("is-pressed");
    
42.     }, false);
    
43.     window.addEventListener("mousemove", function(e) {
    
44.       let x = e.clientX;
    
45.       let y = e.clientY;
    
46.       pointer.style.top = y + "px";
    
47.       pointer.style.left = x + "px";
    
48.     }, false);
    
49.   } else {
    
50.     console.log("canvas or addEventListener is unsupported!");
    
51.   }
    
52. 
    
53. 
    
54.   function updateSize() {
    
55.     canvas.width = window.innerWidth * 2;
    
56.     canvas.height = window.innerHeight * 2;
    
57.     canvas.style.width = window.innerWidth + 'px';
    
58.     canvas.style.height = window.innerHeight + 'px';
    
59.     ctx.scale(2, 2);
    
60.     width = (canvas.width = window.innerWidth);
    
61.     height = (canvas.height = window.innerHeight);
    
62.     origin = {
    
63.       x: width / 2,
    
64.       y: height / 2
    
65.     };
    
66.     normal = {
    
67.       x: width / 2,
    
68.       y: height / 2
    
69.     };
    
70.   }
    
71.   class Ball {
    
72.     constructor(x = origin.x, y = origin.y) {
    
73.       this.x = x;
    
74.       this.y = y;
    
75.       this.angle = Math.PI * 2 * Math.random();
    
76.       if (longPressed == true) {
    
77.         this.multiplier = randBetween(14 + multiplier, 15 + multiplier);
    
78.       } else {
    
79.         this.multiplier = randBetween(6, 12);
    
80.       }
    
81.       this.vx = (this.multiplier + Math.random() * 0.5) * Math.cos(this.angle);
    
82.       this.vy = (this.multiplier + Math.random() * 0.5) * Math.sin(this.angle);
    
83.           //小球大小
    
84.       this.r = randBetween(2, 1) + 2 * Math.random();
    
85.       this.color = colours[Math.floor(Math.random() * colours.length)];
    
86.     }
    
87.     update() {
    
88.       this.x += this.vx - normal.x;
    
89.       this.y += this.vy - normal.y;
    
90.       normal.x = -2 / window.innerWidth * Math.sin(this.angle);
    
91.       normal.y = -2 / window.innerHeight * Math.cos(this.angle);
    
92.       //消失速度
    
93.           this.r -= 0.1;
    
94.           //横向扩大范围
    
95.       this.vx *= 0.9;
    
96.           //纵向扩大范围
    
97.       this.vy *= 0.9;
    
98.     }
    
99.   }
    
100. 
     
101.   function pushBalls(count = 1, x = origin.x, y = origin.y) {
     
102.     for (let i = 0; i < count; i++) {
     
103.       balls.push(new Ball(x, y));
     
104.     }
     
105.   }
     
106. 
     
107.   function randBetween(min, max) {
     
108.     return Math.floor(Math.random() * max) + min;
     
109.   }
     
110. 
     
111.   function loop() {
     
112.     ctx.fillStyle = "rgba(255, 255, 255, 0)";
     
113.     ctx.clearRect(0, 0, canvas.width, canvas.height);
     
114.     for (let i = 0; i < balls.length; i++) {
     
115.       let b = balls[i];
     
116.       if (b.r < 0) continue;
     
117.       ctx.fillStyle = b.color;
     
118.       ctx.beginPath();
     
119.       ctx.arc(b.x, b.y, b.r, 0, Math.PI * 2, false);
     
120.       ctx.fill();
     
121.       b.update();
     
122.     }
     
123.     if (longPressed == true) {
     
124.       multiplier += 0.2;
     
125.     } else if (!longPressed && multiplier >= 0) {
     
126.       multiplier -= 0.4;
     
127.     }
     
128.     removeBall();
     
129.     requestAnimationFrame(loop);
     
130.   }
     
131. 
     
132.   function removeBall() {
     
133.     for (let i = 0; i < balls.length; i++) {
     
134.       let b = balls[i];
     
135.       if (b.x + b.r < 0 || b.x - b.r > width || b.y + b.r < 0 || b.y - b.r > height || b.r < 0) {
     
136.         balls.splice(i, 1);
     
137.       }
     
138.     }
     
139.   }
     
140.   }
     
141.   clickEffect();//调用
     
142. </script>

复制代码