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
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