批改状态:合格
老师批语:
<!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 / 评论</title><style>* {margin: 0;padding: 0;box-sizing: border-box;}li {list-style: none;}body {background-color: rgb(174, 236, 236);color: #555;}.comment {width: 85%;margin: 1em auto;display: grid;gap: 0.5em;}.comment #content {resize: none;border: none;padding: 0.5em;outline: none;}.comment #content:focus,.comment #content:hover {box-shadow: 0 0 8px steelblue;transition: 0.6s;}.comment .submit {width: 30%;margin-left: auto;background-color: lightseagreen;border: none;outline: none;color: white;height: 2.5em;}.comment .submit:hover {background-color: seagreen;transition: 0.6s;cursor: pointer;}.list {width: 80%;/* background-color: yellow; */margin: auto;padding: 1em;}.list li {border-bottom: 1px solid #fff;padding-bottom: 20px;margin-bottom: 20px;}.del-btn {background-color: wheat;color: #000;padding: 0.5em 1em;/* height: 2.2em; */border: none;outline: none;}.del-btn:hover {cursor: pointer;background-color: rgb(31, 230, 163);}</style></head><body><form action="" class="comment" id="comment"><label for="content">请留言</label><textarea name="content" id="content" cols="30" rows="10"></textarea><span class="notice">还可以输入100字</span><button class="submit" type="button" name="submit">提交</button></form><ul class="list"></ul></body></html>
<script>//获取元素// formlet comment = document.forms.comment;console.log(comment);let content = comment.content;let btn = comment.submit;let commentList = document.querySelector(".list");let notice = document.querySelector(".notice");// 2给按钮添加事件btn.onclick = (ev) => {//获取留言内容//console.log(content.value.trim().length);// 长度不能超过100 而且大于0if (content.value.trim().length > 0 && content.value.trim().length <= 100) {// 创建留言内容标签然后插入到ul中let li = document.createElement("li");li.textContent = content.value;// 添加删除按钮let delbtn = document.createElement("div");delbtn.textContent = "删除";delbtn.style.float = "right";delbtn.classList.add("del-btn");delbtn.onclick = function () {if (confirm('是否删除')) {// li.remove();this.parentNode.remove();alert("留言删除成功");}}li.append(delbtn);commentList.prepend(li);} else {alert("长度超过100");//超出之后并将输入内容清空// content.value = '';content.focus();return false;}}content.oninput = function () {let textLength = content.value.trim().length;notice.textContent = `还可以输入${100 - textLength}个字`;let lastword = 100 - textLength;if (lastword <= 0) {alert("已输满100字");content.value = content.value.trim().substring(0, 100);// content.disabled = true;// console.log(content.disabled);notice.textContent = `还可以输入0个字`;content.focus();} else {}}</script>
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