评论提交
2022-03-09 本文已影响0人
心存美好
评论提交（不采用节流，用户没有输入内容就不提交,innerHTML方式）
<!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>Document</title>
<style>
body {
font-family: "Microsoft YaHei", serif;
user-select: none
}
body,
dl,
dd,
p,
h1,
h2,
h3,
h4,
h5,
h6 {
margin: 0;
}
ol,
ul,
li {
margin: 0;
padding: 0;
list-style: none;
}
img {
border: none;
}
#wrap {
width: 500px;
margin: 50px auto;
background-color: pink;
}
#text {
width: 494px;
height: 100px;
border: 1px solid #000;
resize: none;
/* 让textarea不可以调整大小 */
}
#inp {
float: right;
}
#list {
width: 100%;
margin-top: 30px;
}
#list li {
width: 100%;
line-height: 22px;
font-size: 14px;
color: #333;
text-indent: 2em;
padding: 10px 0;
border-bottom: 1px dotted #999;
}
</style>
</head>
<body>
<div id="wrap">
<textarea id="text"></textarea>
<input type="text" id="inp" value="提交">
<ul id="list">
<li>11</li>
<li>33</li>
<li>44</li>
<li>66</li>
<li>66</li>
</ul>
</div>
<script>
//不采用节流的方式
//获取元素
let oText = document.getElementById('text'), oBtn = document.getElementById('inp'), oList = document.getElementById('list')
//绑定函数
oBtn.onclick = function () {
console.log(11111);
let val = oText.value.trim() //获取内容
if (val) {
oList.innerHTML += `<li>${val}</li>` //将内容加到页面上innerHMTL方式
oText.value = ''//清空表单
}
}
</script>
</body>
</html>
采用节流方式:用户没有输入内容时，有个弹框提示 innerHTML方式
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
body {
font-family: "Microsoft YaHei", serif;
user-select: none
}
body,
dl,
dd,
p,
h1,
h2,
h3,
h4,
h5,
h6 {
margin: 0;
}
ol,
ul,
li {
margin: 0;
padding: 0;
list-style: none;
}
img {
border: none;
}
#wrap {
width: 500px;
margin: 50px auto;
background-color: pink;
}
#text {
width: 494px;
height: 100px;
border: 1px solid #000;
resize: none;
/* 让textarea不可以调整大小 */
}
#inp {
float: right;
}
#list {
width: 100%;
margin-top: 30px;
}
#list li {
width: 100%;
line-height: 22px;
font-size: 14px;
color: #333;
text-indent: 2em;
padding: 10px 0;
border-bottom: 1px dotted #999;
}
</style>
</head>
<body>
<div id="wrap">
<textarea id="text"></textarea>
<input type="text" id="inp" value="提交">
<ul id="list">
<li>11</li>
<li>33</li>
<li>44</li>
<li>66</li>
<li>66</li>
</ul>
</div>
<script>
//采用节流方式:用户没有输入内容时，有个弹框提示
//获取元素
let oText = document.getElementById('text'), oBtn = document.getElementById('inp'), oList = document.getElementById('list')
//绑定函数
oBtn.onclick = function () {
let val = oText.value.trim()
if (!val) {
alert('请输入内容')
return; //输入为空时就跳过后面的代码，就是节流
}
oList.innerHTML += `<li>${val}</li>` //将内容加到页面上innerHTML方式插入
oText.value = ''//清空表单
}
</script>
</body>
</html>
节点方式操作
<!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>Document</title>
<style>
body {
font-family: "Microsoft YaHei", serif;
user-select: none
}
body,
dl,
dd,
p,
h1,
h2,
h3,
h4,
h5,
h6 {
margin: 0;
}
ol,
ul,
li {
margin: 0;
padding: 0;
list-style: none;
}
img {
border: none;
}
#wrap {
width: 500px;
margin: 50px auto;
background-color: pink;
}
#text {
width: 494px;
height: 100px;
border: 1px solid #000;
resize: none;
/* 让textarea不可以调整大小 */
}
#inp {
float: right;
}
#list {
width: 100%;
margin-top: 30px;
}
#list li {
width: 100%;
line-height: 22px;
font-size: 14px;
color: #333;
text-indent: 2em;
padding: 10px 0;
border-bottom: 1px dotted #999;
}
</style>
</head>
<body>
<div id="wrap">
<textarea id="text"></textarea>
<input type="text" id="inp" value="提交">
<ul id="list">
</ul>
</div>
<script>
//采用节点操作
//获取元素
let oText = document.getElementById('text'), oBtn = document.getElementById('inp'), oList = document.getElementById('list')
//绑定函数
oBtn.onclick = function () {
console.log(111);
let val = oText.value.trim()
if (!val) {
alert('请输入内容')
return; //输入为空时就跳过后面的代码
}
let oLi = document.createElement('li') //采用节点操作
oLi.innerHTML = val
if (oList.children) { //有子节点，就在第一个子节点前插入
oList.insertBefore(oLi, oList.children[0])
} else {
oList.appendChild(oLi)
}
oText.value = ''
}
</script>
</body>
</html>
