使用 JavaScript 生成随机生日祝福

在本文中，我们将学习如何使用 HTML、CSS 和 JavaScript 创建一个生成随机生日祝福的网页。

方法：

HTML 代码：在本节中，我们将创建 HTML 文件的基本结构，即它包含 、、 标签等。

HTML

CSS 代码：用于设置 HTML 文档的样式。在这里，我们设置文档的宽度、高度和位置。我们将使用 CSS 媒体查询在不同尺寸的屏幕上设置样式。

CSS

.body-bg {
    width: 100%;
    height: 100%;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translateX(-50%) translateY(-50%);
    background: radial-gradient(#00E7BD, #013A4E);
    transition: all 0.5s;
}
    
.container {
    width: 80%;
    height: 80%;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translateX(-50%) translateY(-50%);
    background: linear-gradient(#00E7BD, #013A4E);
    box-shadow: 0 0 20px 2px #013A4E;
}
    
.container-data {
    padding: 24px;
    position: absolute;
    top: 50%;
    left: 50%;
    width: 80%;
    transform: translateX(-50%) translateY(-50%);
    text-align: center;
    color: #fff;
    font-family: Arial;
    font-size: 3vw;
}
    
@media only screen and (max-width: 763px) {
    .container-data {
        padding: 24px;
        position: absolute;
        top: 50%;
        left: 50%;
        width: 80%;
        transform: translateX(-50%) translateY(-50%);
        text-align: center;
        color: #fff;
        font-family: Arial;
        font-size: 6vw;
    }
}
    
@media only screen and (max-height: 423px) {
    .container-data {
        padding: 24px;
        position: absolute;
        top: 50%;
        left: 50%;
        width: 80%;
        transform: translateX(-50%) translateY(-50%);
        text-align: center;
        color: #fff;
        font-family: Arial;
        font-size: 4vw;
    }
}

JavaScript 代码：现在我们想向某人显示随机生日消息，这可以通过 JavaScript 来完成。在本节中，我们将所有消息存储在一个数组变量中，然后使用 array.length 属性来检查数组的大小。之后使用 math.random()函数生成一个随机数来显示随机消息。

JavaScript

var messages = ["Happy birthday to GFG",
    "Happy birthday to GeeksforGeeks",
    "Happy birthday to Geeks"];
  
var i = messages.length;
var s = Math.floor(Math.random() * i);
  
document.getElementById("msg")
    .innerHTML = '" ' + messages[s] + ' "';

完整代码：结合以上三段代码，生成随机生日祝福信息。

  

    
    
      
    
        .body-bg {
            width: 100%;
            height: 100%;
            position: fixed;
            top: 50%;
            left: 50%;
            transform: translateX(-50%) translateY(-50%);
            background: radial-gradient(#00e7bd, #013a4e);
            transition: all 0.5s;
        }
  
        .container {
            width: 80%;
            height: 80%;
            position: fixed;
            top: 50%;
            left: 50%;
            transform: translateX(-50%) translateY(-50%);
            background: linear-gradient(#00e7bd, #013a4e);
            box-shadow: 0 0 20px 2px #013a4e;
        }
  
        .container-data {
            padding: 24px;
            position: absolute;
            top: 50%;
            left: 50%;
            width: 80%;
            transform: translateX(-50%) translateY(-50%);
            text-align: center;
            color: #fff;
            font-family: Arial;
            font-size: 3vw;
        }
  
        @media only screen and (max-width: 763px) {
            .container-data {
                padding: 24px;
                position: absolute;
                top: 50%;
                left: 50%;
                width: 80%;
                transform: translateX(-50%) translateY(-50%);
                text-align: center;
                color: #fff;
                font-family: Arial;
                font-size: 6vw;
            }
        }
  
        @media only screen and (max-height: 423px) {
            .container-data {
                padding: 24px;
                position: absolute;
                top: 50%;
                left: 50%;
                width: 80%;
                transform: translateX(-50%) translateY(-50%);
                text-align: center;
                color: #fff;
                font-family: Arial;
                font-size: 4vw;
            }
        }
    

  

    
    
        
            
        
    
  
    
        var messages = ["Happy birthday to GFG",
            "Happy birthday to GeeksforGeeks",
            "Happy birthday to Geeks"];
  
        var i = messages.length;
        var s = Math.floor(Math.random() * i);
          
        document.getElementById("msg")
            .innerHTML = '" ' + messages[s] + ' "';
    

  

输出：