js操作元素，图像只能显示html内容里面的图片 script里面的没有显示

js操作元素，图像只能显示html内容里面的图片 script里面的没有显示，能看一下代码哪里出问题了吗

Amami Yuki

Kayo Asano

Siziki Asato

<script>
    var thyx = document.getElementById('Amami Yuki');
    var mnjs = document.getElementById('Kayo Asano');
    var zych = document.getElementById('Siziki Asato');

    thyx.onclick = function() {
        img.src = "../js/amami yuki.jpg";
        img.title = '天海祐希';
    }
    mnjs.onclick - function() {
        img.src = '../js/Asano Kayo.jpg';
        img.title = '麻乃佳世';
    }
    zych.onclick - function() {
        img.src = "../js/Siziki Asato.jpg ";
        img.title = '姿月朝户';
    }
script>

代码写的有问题，更改的代码如下所示

<!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 type="text/css">
       
    </style>
</head>
<body>
    <p><button id="Amami Yuki">Amami Yuki</button></p>
    <p><button id="Kayo Asano">Kayo Asano</button></p>
    <p><button id="Siziki Asato">Siziki Asato</button></p>
    <img src="../js/Asano Kayo.jpg" alt='' title="天海佑希" id="img01">

    <script>
        var thyx = document.getElementById('Amami Yuki');
        var mnjs = document.getElementById('Kayo Asano');
        var zych = document.getElementById('Siziki Asato');
        var img=document.getElementById("img01");
        thyx.onclick = function() {
            // alert("进入了吗");
            img.src = "../js/amami yuki.jpg";
            img.title = '天海祐希';
        }
        mnjs.onclick=function() {
            img.src = '../js/Asano Kayo.jpg';
            img.title = '麻乃佳世';
        }
        zych.onclick=function() {
            img.src = "../js/Siziki Asato.jpg ";
            img.title = '姿月朝户';
        }
    </script>    
 <input type="radio" name="职位" >部门 <input type="radio" name="职位" >教师  <input type="radio" name="职位" >学生 <input type="radio" name="职位" >
</body>
</html>


<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>
</head>

<body>
    <p><button id="Amami Yuki">Amami Yuki</button></p>
    <p><button id="Kayo Asano">Kayo Asano</button></p>
    <p><button id="Siziki Asato">Siziki Asato</button></p>
    <img src="../js/Asano Kayo.jpg" alt='' title="天海佑希">

    <script>
        var thyx = document.getElementById('Amami Yuki');
        var mnjs = document.getElementById('Kayo Asano');
        var zych = document.getElementById('Siziki Asato');

        thyx.onclick = function() {
            img.src = "../js/amami yuki.jpg";
            img.title = '天海祐希';
        }
        mnjs.onclick - function() {
            img.src = '../js/Asano Kayo.jpg';
            img.title = '麻乃佳世';
        }
        zych.onclick - function() {
            img.src = "../js/Siziki Asato.jpg ";
            img.title = '姿月朝户';
        }
    </script>

img 是从哪获取的，你要在 script 里面初始化 img 变量，才能设置 src 和 title

<script>
    var thyx = document.getElementById('Amami Yuki');
    var mnjs = document.getElementById('Kayo Asano');
    var zych = document.getElementById('Siziki Asato');
  var img = document.getElementById('图片的');
    thyx.onclick = function() {
        img.src = "../js/amami yuki.jpg";
        img.title = '天海祐希';
    }
    mnjs.onclick - function() {
        img.src = '../js/Asano Kayo.jpg';
        img.title = '麻乃佳世';
    }
    zych.onclick - function() {
        img.src = "../js/Siziki Asato.jpg ";
        img.title = '姿月朝户';
    }
</script>