【js效果】密码的显示和隐藏

效果图：
素材：
close.png

open.png
源码：
<!doctype html>
<html>

<head>
    <meta charset="utf-8">
    <title>无标题文档</title>
    <style>
        .box {
            position: relative;
             400px;
            border: 1px solid #E3E3E3;
            margin: 100px auto;
            padding: 2px;
        }

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

        .box img {
            position: absolute;
            top: 4px;
            right: 6px;
             24px;
            cursor: pointer;
        }
    </style>
</head>

<body>
    <div class="box">
        <label for="">
            <img src="images/close.png" alt="" id="eye">
        </label>
        <input type="password" name="" id="pwd">
    </div>
    <script>
        var eye = document.getElementById('eye');
        var pwd = document.getElementById('pwd');
        var flag = 0;
        eye.onclick = function () {
            if (flag == 0) {
                pwd.type = 'text';
                eye.src = 'images/open.png';
                flag = 1;
            } else {
                pwd.type = 'password';
                eye.src = 'images/close.png';
                flag = 0;
            }
        };
    </script>
</body>

</html>