jQuery选择器值返回未定义

我得到了我的变量'base'的undefined，这是基本的$('slider').value。我已经添加了console.log(base)来测试返回的内容，但是值是未定义的。

这是我的html:

jQuery(document).ready(function($) {
let precentage = 17.5;
let commision = 0.2746;
function cost() {
let base = $('#slider').value;
let precentAmout = base * (precentage / 365 * 30);
let commisionAmout = base * commision;
let totalCost = commisionAmout + precentAmout;
let totalSum = base + commisionAmout + precentAmout;
console.log(base);

$('#cost').text(totalCost);
$('#sum').text(totalSum);
}

$('#slider').on('change', function() {
$('#amout').text(this.value);
cost();
});
})

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="calc">
<div class="range-title">
<h2 class="range-label">Ile chcesz pożyczyć?</h2>
<div class="display-wrap">
<span id="amout">500</span><span class="currency"> zł</span>
</div>
</div>
<div class="range-wrap">
<button class="buttons-change-value">-</button>
<input id="slider" class="range-input" type="range" min="500" max="1500" step="50" value="500">
<button class="buttons-change-value">+</button>
</div>
<div class="summary-container">
<div class="summary-box">
<h3>Koszt:<br>
<span id="cost">200</span><span class="currency"> zł</span></h3>
</div>
<div class="summary-box">
<h3>Do zwrotu:<br>
<span id="sum">200</span><span class="currency"> zł</span></h3>
</div>
<div class="summary-box">
<h3>RRSO:<br>
<span id="rrso">200</span><span class="percentage"> %</span></h3>
</div>
</div>
</div>

你知道为什么会这样吗?

在JQuery,.val ()提供获取文本框值的功能。

let base = $('#slider').val()

jQuery(document).ready(function($) {
let precentage = 17.5;
let commision = 0.2746;
function cost() {
let base = $('#slider').val();
let precentAmout = base * (precentage / 365 * 30);
let commisionAmout = base * commision;
let totalCost = commisionAmout + precentAmout;
let totalSum = base + commisionAmout + precentAmout;
console.log(base);

$('#cost').text(totalCost);
$('#sum').text(totalSum);
}

$('#slider').on('change', function() {
$('#amout').text(this.value);
cost();
});
})

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="calc">
<div class="range-title">
<h2 class="range-label">Ile chcesz pożyczyć?</h2>
<div class="display-wrap">
<span id="amout">500</span><span class="currency"> zł</span>
</div>
</div>
<div class="range-wrap">
<button class="buttons-change-value">-</button>
<input id="slider" class="range-input" type="range" min="500" max="1500" step="50" value="500">
<button class="buttons-change-value">+</button>
</div>
<div class="summary-container">
<div class="summary-box">
<h3>Koszt:<br>
<span id="cost">200</span><span class="currency"> zł</span></h3>
</div>
<div class="summary-box">
<h3>Do zwrotu:<br>
<span id="sum">200</span><span class="currency"> zł</span></h3>
</div>
<div class="summary-box">
<h3>RRSO:<br>
<span id="rrso">200</span><span class="percentage"> %</span></h3>
</div>
</div>
</div>

jQuery对象没有value属性，他们有一个val()方法。

您始终可以将基本变量值作为参数传递给成本函数，如cost(this.value)。这将更有意义，因为你已经通过onChange获取滑块值一次，不需要在成本函数中再次这样做。

请看下面的工作代码片段。

jQuery(document).ready(function ($) {
let precentage = 17.5;
let commision = 0.2746;
function cost(sliderValue) {
let base = sliderValue;
let precentAmout = base * (precentage / 365 * 30);
let commisionAmout = base * commision;
let totalCost = commisionAmout + precentAmout;
let totalSum = base + commisionAmout + precentAmout;
console.log(base);

$('#cost').text(totalCost);
$('#sum').text(totalSum);
}

$('#slider').on('change', function () {
$('#amout').text(this.value);
cost(this.value);
});})

<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>JS Bin</title>
</head>
<body>
<div class="calc">
<div class="range-title">
<h2 class="range-label">Ile chcesz pożyczyć?</h2>
<script src="https://code.jquery.com/jquery-3.1.0.js"></script>
<div class="display-wrap">
<span id="amout">500</span><span class="currency"> zł</span>
</div>
</div>
<div class="range-wrap">
<button class="buttons-change-value">-</button>
<input id="slider" class="range-input" type="range" min="500" max="1500" step="50" value="500">
<button class="buttons-change-value">+</button>
</div>
<div class="summary-container">
<div class="summary-box">
<h3>Koszt:<br>
<span id="cost">200</span><span class="currency"> zł</span></h3>
</div>
<div class="summary-box">
<h3>Do zwrotu:<br>
<span id="sum">200</span><span class="currency"> zł</span></h3>
</div>
<div class="summary-box">
<h3>RRSO:<br>
<span id="rrso">200</span><span class="percentage"> %</span></h3>
</div>
</div>
</div>
</body>
</html>

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