1、代码正常书写如下
<div class="box"></div> <!-- JavaScript代码 --> <script> // 创建节点 let box = document.getElementsByClassName("box"); let words = document.createElement("span"); words.innerHTML = "hello word!"; box.appendChild(words); </script>
2、出现报错信息 box.appendChild is not a function
3、解决办法
let box = document.getElementsByClassName("box")[0];