Почему код не работает?

 <!DOCTYPE html>
<html lang="ru">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
body {
background-color: #b5fd8d;
user-select: none;
}
 
.container {
display: grid;
grid-template-columns: 1fr 1fr 1fr 1fr;grid-gap: 4px;
background-color: #212121;
padding: 4px;
border-radius: 5px;
max-width: 360px;
font-family: 'Tahoma;'
}
.item {
background-color: #b3e5fc;
color: #000;
padding: 20px;
display: -webkit-flex;
display: -moz-flex;
display: -ms-flex;
display: -o-flex;
display: flex;
justify-content: center;
-ms-align-items: center;
font-size: 22px;
cursor: pointer;
font-weight: bold;
}
form {
min-width: 100%;
}
input {
width: calc(100% - 2px);
height: 60px;
border: none;
outline: 0;
font-size: 30px;
text-align: right;
}
.input {
grid-column: 1/-1;
padding: 0;
}
.clean {
grid-column: 1/3;
background-color: #0288d1;
}
.back {
grid-column: 3/-1;
}
.equal {
grid-column: 4;
grid-row: 6/8;
background-color: #bdbdbd;
}
.zero {
grid-column: 1/3;
}


</style>
</head>
<body>
 
 


<div class="container">
<div class="item input" ><form name="form" action=""><input type="text" readonly></form>
</div>
<div class="item clean">C</div>
<div class="item back">&larr;</div>
<div class="item" onclick="insert('+')">+</div>
<div class="item" onclick="insert('-')">-</div>
<div class="item" onclick="insert('*')">&times;</div>
<div class="item" onclick="insert('/')">&divide;</div>
<div class="item">7</div>
<div class="item">8</div>
<div class="item">9</div>
<div class="item">(</div>
<div class="item">4</div>
<div class="item">5</div>
<div class="item">6</div>
<div class="item">)</div>
<div class="item">1</div>
<div class="item">2</div>
<div class="item">3</div>
<div class="item equal">=</div>
<div class="item zero">0</div>
<div class="item">.</div>
</div>


 


<script>
 


function insert(num) {
document.form.textview.value = document.form.textview.value + num;
}


</script>
</body>
</html>

html

css

1 ответов

Потому что в коде написано так:

function insert(num) {
document.form.textview.value = document.form.textview.value + num;
}

НО, в html нет input с textview:

<div class="item input" ><form name="form" action=""><input type="text" readonly></form>

Нужно input выше заменить на этот input:

<input name="textview" value="0">