布尔值开关

作者: 阿布朗迪 | 来源:发表于2018-10-16 08:04 被阅读0次

通过这个简单的按钮展示出布尔值开关的好处和使用方法

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>布尔值开关</title>
    <style>
        .box{
            width: 100px;
            height: 100px;
           background: #eee;
        }
    </style>
</head>
<body>
    <input type="button" value="点击切换颜色">
    <div class="box">

    </div>
</body>
<script>
    var btn = document.querySelector( 'input'),
        box = document.querySelector('.box');

    var  flag = false;
    btn.onclick = function(){
        if(flag){
            box.style.background = '#232323';
            flag = false;
        }else{
            box.style.background = '#292292';
            flag = true;
        }
    }
</script>
</html>