关于#前端#的问题，如何解决？

前端练习
密码输入栏，实现密码能够实现可见与不可见。
打出来后无法实现功能，请问哪里出问题了呢？

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">
    <title>Documenttitle>
    <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;
            width: 24px;
            top: 2px;
            right: 2px;
        }
    style>
head>

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

html>

if判断的括号里要写 == 或者 === 才可以进行判断 ，给你修改的代码如下，有用的话采纳一下吧

<!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">
    <title>Document</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;
            width: 24px;
            top: 2px;
            right: 2px;
        }
    </style>
</head>
 
<body>
    <div class="box">
        <label for='' id="lbl">
        <img src="..\Dom\close.png" alt="" id="eye">
    </label>
        <input type="password" name="" id="psw">
    </div>
    <script>
        var eye = document.getElementById('eye');
        var psw = document.getElementById('psw');
        var lbl = document.getElementById('lbl');
        var flag = 0;
        eye.onclick = function() {
            if (flag === 0) {
                psw.type = 'text';
                flag = 1;
            } else {
                psw.type = 'password';
                flag = 0;
            }
        }
    </script>
</body>
 
</html>