仿京东显示隐藏密码

<!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>仿京东显示隐藏密码</title>
    <style>.box {
            position: relative;
            width: 400px;
            border-bottom: 1px solid #ccc;
            margin: 100px auto;
        }

        .box input {
            width: 370px;
            height: 30px;
            border: 0;
            outline: none;
        }

        .box img {
            position: absolute;
            top: 2px;
            right: 2px;
            width: 24px;
        }</style>
</head>

<body>
    <div class="box">

        <label for="">
            <img src="https://pic.imgdb.cn/item/612107664907e2d39c30e067.png" alt="" id="eye"><!-- 隐藏密码 -->
        </label>

        <input type="password" name="" id="pwd">
    </div>


    <script>// 1. 获取元素
        var eye = document.getElementById('eye');
        var pwd = document.getElementById('pwd');

        // 2. 注册事件 处理程序
        var flag = 0;
        eye.onclick = function () {
            // 点击一次之后， flag 一定要变化
            if (flag == 0) {  //点击之后显示密码
                pwd.type = 'text';
                eye.src = 'https://pic.imgdb.cn/item/612107834907e2d39c312632.png';
                flag = 1; // 赋值操作
            }
            else {  //点击之后隐藏密码
                pwd.type = 'password';
                eye.src = 'https://pic.imgdb.cn/item/612107664907e2d39c30e067.png';
                flag = 0;
            }

        }</script>
</body>

</html>