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js菜鸟,想请教一个问题,关于DOM元素获取

我想取到 两个 select 里面的值。 所以第一步我先取到select元素,这一步console显示没有问题。

但是当我console.log(nums[0]);时 为什么显示undefined呢?? 我后来用getElementById()取值,显示null。

求助大家!

--------------------html部分

<!DOCTYPE html>

<html>

<head>

           <title>calculator</title>

           <link rel="stylesheet" type="text/css" href="calculator.css">

           <script type="text/javascript" src="calculator.js"></script>

</head>

<body>

           <div class="basket">

                     <div class="items">

                                <img src="img/casual boots.jpeg">

                                <p>Boots</p>

                                <select id="boots_num">

                                          <option value="1">1</option>

                                          <option value="2">2</option>

                                          <option value="3">3</option>

                                          <option value="4">4</option>

                                          <option value="5">5</option>

                                          <option value="6">6</option>

                                          <option value="7">7</option>

                                          <option value="8">8</option>

                                          <option value="9">9</option>

                                          <option value="10">10</option>

                                </select>

                                <div class="price_part">

                                          <p class="total_price">C$ 120.00</p>

                                          <button class="remove">Remove this item</button>

                                </div>

                     </div>

                     <div class="items">

                                <img src="img/high-heeled shoes.jpeg">

                                <p>High-heeled shoes</p>

                                <select id="shoes_num">

                                          <option value="1">1</option>

                                          <option value="2">2</option>

                                          <option value="3">3</option>

                                          <option value="4">4</option>

                                          <option value="5">5</option>

                                          <option value="6">6</option>

                                          <option value="7">7</option>

                                          <option value="8">8</option>

                                          <option value="9">9</option>

                                          <option value="10">10</option>

                                </select>

                                <div class="price_part">

                                          <p class="total_price">C$ 89.00</p>

                                          <button class="remove">Remove this item</button>

                                </div>

                     </div>

           </div>

           <div class="check_out">

                     <p>Order summary</p>

                     <div>

                         <span>Merchandise subtotal</span>

                         <span class="subtotal"></span>

                     </div>

                     <div>

                         <span>Shipping & Handling</span>

                         <span class="shipping">C$ 15.00</span>

                     </div>

                     <div>

                         <span>Estimated total</span>

                         <span class="estimated_total">C$ 0.00</span>

                         <p>Shipping & taxes calculated during checkout</p>

                     </div>

           </div>

</body>

</html>

------------------js部分

const nums=document.getElementsByTagName('select');

console.log(nums[0]);



-------------------我的截图

https://img1.mukewang.com/5c6580750001ddc202990122.jpghttps://img.mukewang.com/5c6580800001820706510731.jpg


LizhiH
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1回答

LizhiH

我的<script>引用不应该放在<head>里已经解决,不需要回答了,谢谢~
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