批改状态:合格
老师批语:可以, 效果实现的不错, 可以再尝试用css美化一下
<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>留言板案例</title></head><body><style>div {width: 300px;height: 500px;border: 3px solid black;display: grid;grid-template-rows: 1fr 30px;background-color: green;}div > input{background-color: rgb(71, 37, 174);}li {list-style: none;border: 1px solid red;margin: 5px;}</style><div><ul class="test"></ul><input type="text" onkeydown="insertComment(this)" placeholder="请输入留言" autofocus></div><script>const insertComment = function(ele){// 按下回车键提交if(event.key === 'Enter'){// 非空判断if(ele.value.length === 0){alert('消息不能为空')// 重置焦点ele.focus()// 直接返回return false}const ul = document.querySelector('.test');ul.insertAdjacentHTML('beforeend', `<li>${ele.value}</li>`);ele.value = null}}</script></body></html>
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