ES6-Exercises/E34.html at main · npedroza/ES6-Exercises · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <style>
        .container{
            display: flex;
            margin: 120px;
            padding: 120px;
        }
        .ball{
            position: relative;
            width: 100px;
            height: 100px;
            background:purple;
            border-radius: 100px;
            margin: 100 px;
        }
        .height{
            position: relative;
            margin: 0;
            padding: 30px
        }
        .btnBounce {
            background-color: blue;
            border: solid;
            border-color: black;
            color: white;
            padding: 15px 50px;
            text-align: center;
            text-decoration: none;
            display: inline-block;
            font-size: 16px;
            margin: 4px 2px;
            cursor: pointer;
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="ball">
            <p class="height">10.0 m</p>
        </div>
    </div>
    <button class='btnBounce'>Start the fall</button>
    <script >
        let button = document.querySelector('.btnBounce');
        let text = document.querySelector('.height');

        let g = -9.8, y = 0;
        button.addEventListener('click', bouncing);
        function bouncing(){
            let v0 = 0,
            s0 = 10,
            t = 0,
            H = 9;
            y = 0;
            let step = setInterval(falling, 50);
            let ball = document.querySelector('.ball');
            function falling(){
                y = pos(t,v0,s0);
                if (y<=0){
                    t = 0;
                    v0 =  Math.sqrt(-2*H*g);
                    s0 = 0;
                    H--;
                    y=0;
                    if (H < 0){
                        clearInterval(step);
                        button.style.display = 'block';
                    }
                }
                ball.style.top = 100-10*y + 'px'
                text.textContent = `${String(y).substring(0,3)} m`
                t++;
            }
            function pos(t,v0,s0){
                return (g*(t**2))/2 + v0*t + s0;
            }
        }
    </script>
</body>
</html>