前端小例子 基础js css html练习
前情提要:
学前端也有一阵了,个人感觉前端还是重要的.
html 学习教程
https://www.cnblogs.com/baili-luoyun/p/10466040.html
css 教程
js 教程
https://www.cnblogs.com/baili-luoyun/p/10453714.html
本次主要是分享几个综合小例子
案例一:
js的事件交互
知识点:
代码:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>js </title>
<script>
function cherkname(username) {
if (username==''){
alert("用户名不能为空") }
}
</script>
</head>
<body onload="alert('页面全部加载完成')">
用户名:<input type="text" value="小宝" onfocus="this.value=''" onblur="cherkname(this.value)">
</body>
</html>
案例二:
利用math 对象 选择 循环等进行判断数字
代码:
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="utf-8"> <title>猜数字游戏</title> <style>
html {
font-family: sans-serif
} body {
width: 50%;
max-width: 800px;
min-width: 480px;
margin: 0 auto
} .lastResult {
color: white;
padding: 3px
}
</style>
</head> <body>
<h1>猜数字游戏</h1> <p>我刚才随机选定了一个100以内的自然数。看你能否在 10 次以内猜中它。每次我都会告诉你所猜的结果是高了还是低了。</p> <div class="form">
<label for="guessField">请猜数: </label>
<input type="text" id="guessField" class="guessField">
<input type="submit" value="确定" class="guessSubmit">
</div> <div class="resultParas">
<p class="guesses"></p>
<p class="lastResult"></p>
<p class="lowOrHi"></p>
</div> <script>
// 开始编写 JavaScript 代码
let randomNumber = Math.floor(Math.random() * 100) + 1; const guesses = document.querySelector('.guesses');
const lastResult = document.querySelector('.lastResult');
const lowOrHi = document.querySelector('.lowOrHi'); const guessSubmit = document.querySelector('.guessSubmit');
const guessField = document.querySelector('.guessField'); let guessCount = 1;
let resetButton; function checkGuess() {
let userGuess = Number(guessField.value);
if (guessCount === 1) {
guesses.textContent = '上次猜的数：';
}
guesses.textContent += userGuess + ' '; if (userGuess === randomNumber) {
lastResult.textContent = '恭喜你！猜对了';
lastResult.style.backgroundColor = 'green';
lowOrHi.textContent = '';
setGameOver();
} else if (guessCount === 10) {
lastResult.textContent = '!!!GAME OVER!!!';
setGameOver();
} else {
lastResult.textContent = '你猜错了！';
lastResult.style.backgroundColor = 'red';
if (userGuess < randomNumber) {
lowOrHi.textContent = '你猜低了！';
} else if (userGuess > randomNumber) {
lowOrHi.textContent = '你猜高了';
}
} guessCount++;
guessField.value = '';
guessField.focus();
} guessSubmit.addEventListener('click', checkGuess); function setGameOver() {
guessField.disabled = true;
guessSubmit.disabled = true;
resetButton = document.createElement('button');
resetButton.textContent = '开始新游戏';
document.body.appendChild(resetButton);
resetButton.addEventListener('click', resetGame);
}
function resetGame() {
guessCount = 1; const resetParas = document.querySelectorAll('.resultParas p');
for (let i = 0 ; i < resetParas.length; i++) {
resetParas[i].textContent = '';
} resetButton.parentNode.removeChild(resetButton); guessField.disabled = false;
guessSubmit.disabled = false;
guessField.value = '';
guessField.focus(); lastResult.style.backgroundColor = 'white'; randomNumber = Math.floor(Math.random() * 100) + 1;
}
</script>
</body>
</html>
案例三:
创建按钮 切换图片
知识点 数组 自增加
代码:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script>
window.onload = function () {
let img1 = document.getElementsByTagName("img")[0];
let left = document.getElementById("bt1");
let right = document.getElementById("bt2");
let num = 0;
let arrimg = ["image/1.jpg", "image/2.jpg"
, "image/3.jpg", "image/4.jpg", "image/5.jpg"];
let text = document.getElementById("ye");
text.innerHTML = (num + 1) + "页" + "/" + arrimg.length + "页"; function left1() {
num--; if (num < 1) {
num = 0;
}
img1.src = arrimg[num];
text.innerHTML = (num + 1) + "页" + "/" + arrimg.length + "页";
} function right1() { num++; if (num == arrimg.length) {
num = 0
}
img1.src = arrimg[num];
text.innerHTML = (num + 1) + "页" + "/" + arrimg.length + "页";
} left.onclick = function () {
left1()
};
right.onclick = function () {
right1()
} }
</script>
<style>
.dd1 {
width: 500px;
height: 500px;
text-align: center;
background-color: #00c4ff;
margin: 30px auto;
} img {
width: 400px;
height: 400px;
} #an {
margin-top: 20px;
} .bt {
padding: 20px;
margin-left: 10px; } </style>
</head> <body>
<div class="dd1">
<div id="t1">
<img src="data:image/1.jpg"> </div>
<div id="an">
<span id="ye">图片1</span>
<button class="bt" id="bt1">上一页</button>
<button class="bt" id="bt2">下一页</button>
</div>
</div>
</body>
</html>
案例四
商城选择,全选,复选,反选,提交表单
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script>
window.onload=function () { qx.onclick =function () {
let qx =document.getElementById("qx").checked;
let cdnodes =document.getElementsByTagName("input");
for (let i=1;i<cdnodes.length;i++){
cdnodes[i].checked =qx;
}
}
// let dn =document.getElementById("dn");
// let sj =document.getElementById("sj");
// let wj =document.getElementById("wj"); }
</script>
<script>
function yz() { let cdnodes =document.getElementsByTagName("input");
for (let i=1;i<cdnodes.length;i++){
if (cdnodes[i].checked==""){
let stase =window.confirm("确定不购买东西"); return stase
} }
}
let te1= document.getElementsByClassName("te1");
for (let i =1;i<te1.length;i++){
te1[i].title ="请输入数量";
te1[i].placeholder="请输入数量"
} </script>
<style>
.dd1 {
background-color: #00c4ff;
text-align: center;
/*margin: 100px auto;*/
/*width: 500px;*/
height: 400px;
} .tt1 {
font-size: 30px;
line-height: 60px;
margin: auto;
border-spacing: 0px ;
width: 700px;
border: 1px solid red; } .th1 {
margin-left: 40px;
border: 1px solid black; line-height: 60px; }
.xzk{
margin-top: 13px;
width: 20px;
height: 20px;
}
.tijiao{
font-size: 30px ;
}
.te1{
line-height: 30px;
margin-bottom: 15px;
}
</style>
</head>
<body>
<form action="http://www.baidu.com" method="get" onsubmit="return yz()">
<div class="dd1">
<table class="tt1">
<tr class="tr1">
<th class="th1"><input type="checkbox" id="qx" class="xzk" /></th>
<th class="th1">商品名称</th>
<th class="th1">商品价格</th>
<th class="th1">商品库存</th>
<th class="th1">购买数量</th>
</tr>
<tr class="tr1">
<td class="th1"><input type="checkbox" id="dn" class="xzk" name="dn"/></td>
<td class="th1">电脑</td>
<td class="th1">100</td>
<td class="th1">200</td>
<td class="th1"><input type="text" name="dn" class="te1"></td>
</tr>
<tr class="tr1">
<td class="th1"><input type="checkbox" id="sj" class="xzk" name="sj"></td>
<td class="th1">手机</td>
<td class="th1">200</td>
<td class="th1">100</td>
<td class="th1"><input type="text" name="sj" class="te1"></td> </tr>
<tr>
<td class="th1"><input type="checkbox" id="wj" class="xzk" name="wj"></td>
<td class="th1">玩具</td>
<td class="th1">400</td>
<td class="th1">500</td>
<td class="th1"><input type="text" name="wj" class="te1" placeholder="请输入数量"></td> </tr> </table>
<hr> <input type="submit" value="提交" class="tijiao">
<p>您购买的东西是</p>
<p id ="gmsp"></p>
</div>
</form>
</body>
</html>
案例五:
显示当前时间
知识点:主要是date 对象和for 循环的使用
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script>
window.onload =function () {
let p1 = document.getElementById("p1"); //获取p1 dom
let kwhite = "ss"; //增加空白
for (let i = 0; i < 5; i++) { //循环3次
nums1 = Math.floor(Math.random() * 10); //生成随机数向下取整
kwhite+=nums1
} p1.innerText = kwhite }
</script>
<style>
/*.a1{*/
/*background-color: orange;*/
/*width: 500px;*/
/*height: 300px;*/
/*margin: 0px auto;*/
/*}*/
.a2{
background-color: palegreen;
width: 700px;
height: 300px;
margin: 0px auto;
}
.p1{
margin: auto;
line-height: 240px;
font-size: 50px;
text-align: center;
padding: 30px;
border: 1px solid red;
}
</style>
</head>
<body>
<div class="a1"> </div>
<hr>
<div class="a2">
<p class="p1" id="p1"></p>
</div>
</body>
</html>
案例六:
时间案例升级
主要是增加删除节点,增加节点的内容
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script>
window.onload = function () { let texid;//这是定时器id
let nun = 1; function gettime() {
let p_time = document.getElementById("now_time"); let time1 = new Date();
let now_time = time1.toLocaleString();
p_time.innerHTML = now_time;
return now_time
} let start_time = document.getElementById("start-time");
let stop_time = document.getElementById("stop-time");
let nums1 = document.getElementById("nums"); //2 function starts1() {
if (texid == null) {
gettime();
texid = setInterval(gettime, 1000)
}
let num_p = document.createElement("p");
num_p.innerHTML = nun;
nun++;
num_p.setAttribute("class", "sty1");
nums1.appendChild(num_p); let str_p = document.createElement("p"); str_p.innerHTML = gettime(); start_time.appendChild(str_p); str_p.setAttribute("class", "sty1"); } function stops1() {
clearInterval(texid);
texid = null;
let sto_p = document.createElement("p");
sto_p.innerHTML = gettime();
sto_p.setAttribute("class", "sty1");
stop_time.appendChild(sto_p); sto_p.innerHTML = gettime() } let bgh = document.getElementById("bg");
let clears = document.getElementById("clear");
clears.onclick = function () {
nun = 1;
bgh.removeChild(nums1); //2
nums1 = document.createElement("td");
nums1.setAttribute("class", "nums");
bgh.appendChild(nums1); bgh.removeChild(start_time);
start_time = document.createElement("td");
start_time.setAttribute("class","start-time");
bgh.appendChild(start_time); bgh.removeChild(stop_time);
stop_time = document.createElement("td");
stop_time.setAttribute("class","stop-time");
bgh.appendChild(stop_time); }; let sta1 = document.getElementById("start");
sta1.onclick = function () {
starts1()
};
let stp1 = document.getElementById("stop");
stp1.onclick = function () {
stops1()
} }
</script>
<style>
.kezi {
width: 350px;
height: 500px;
border: 1px solid red;
background-color: orange;
float: left;
} .show-time {
width: 900px;
height: 500px;
border: 1px solid green;
background-color: #06b6ef;
float: left;
} .t1 {
width: 900px;
height: 500px;
} .thh {
height: 30px;
} #now_time {
height: 50px;
color: gold;
font-size: 50px;
font-weight: bolder;
text-align: center;
} #start {
margin-top: 50px;
height: 100px;
width: 100px;
margin-left: 50px;
font-size: 30px;
} #stop {
margin-top: 50px;
height: 100px;
width: 100px;
margin-left: 13px;
font-size: 30px;
} #clear {
margin-top: 30px;
height: 100px;
width: 200px;
margin-left: 60px;
font-size: 30px;
} .sty1 {
font-size: 30px;
color: red;
} #start-time {
width: 350px;
} #stop-time {
width: 350px;
} #nums {
width: 100px;
}
</style>
</head>
<body>
<div class="kezi">
<div class="show-class">
<p id="now_time">00:00:00</p>
<button id="start">开始</button>
<button id="stop">结束</button>
<br>
<button id="clear">清空</button>
</div>
</div>
<div class="show-time">
<table border="1" class="t1">
<tr>
<th class="nums">次数</th>
<th class="thh">start-time</th>
<th class="thh">stop-time</th>
</tr>
<tr id="bg">
<td id="nums"></td>
<td id="start-time"></td>
<td id="stop-time"></td>
</tr>
</table>
</div>
</body>
</html>
案例七:
生成4位随机数
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script>
window.onload =function () {
let p1 = document.getElementById("p1"); //获取p1 dom
let kwhite = "ss"; //增加空白
for (let i = 0; i < 5; i++) { //循环3次
nums1 = Math.floor(Math.random() * 10); //生成随机数向下取整
kwhite+=nums1
} p1.innerText = kwhite }
</script>
<style>
/*.a1{*/
/*background-color: orange;*/
/*width: 500px;*/
/*height: 300px;*/
/*margin: 0px auto;*/
/*}*/
.a2{
background-color: palegreen;
width: 700px;
height: 300px;
margin: 0px auto;
}
.p1{
margin: auto;
line-height: 240px;
font-size: 50px;
text-align: center;
padding: 30px;
border: 1px solid red;
}
</style>
</head>
<body>
<div class="a1"> </div>
<hr>
<div class="a2">
<p class="p1" id="p1"></p>
</div>
</body>
</html>
案例八:
注册界面
节点的增加删除,.css 界面的显示等
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title> <style>
.header{
background-color: #06b6ef;
height: 100px;
}
.bt1{
line-height: 70px;
margin-top: 10px;
width: 500px;
font-size: 30px;
/*height: 200px;*/
}
.mod{
/*background-color: orange;*/
text-align: center;
line-height: 40px;
font-size: 30px;
margin-top: 5px;
padding: 10px; }
.dxck{
padding: 10px;
width: 300px;
color: ghostwhite;
}
.sc{
line-height: 100% ;
height: 30px;
width: 100px;
margin-left: 100px;
}
.hide{
display: none;
}
#show_msg{
height: 350px;
background-color: pink;
position: fixed;
}
.xbnr{
line-height: 100px;
font-size: 80px;
}
input{
font-size: 80px;
}
.close1{
margin-left: 900px;
font-size: 25px; }
body{
height: 1500px;
background-color: black;
}
</style>
</head>
<body>
<div class="header" id="header">
<button class="bt1">增加个人信息</button>
</div>
<div class="mod" id="mod">
<table border="1">
<tbody class="msg1" id="msg1">
<tr>
<th class="dxck">姓名</th>
<th class="dxck">年龄</th>
<th class="dxck">专业</th>
<th class="dxck"></th>
</tr>
<tr>
<td class="dxck">王</td>
<td class="dxck">18</td>
<td class="dxck">计算机</td>
<td class="dxck"><button class="sc" onclick="delnode(this)">删除</button></td>
</tr>
<tr>
<td class="dxck">王2</td>
<td class="dxck">181</td>
<td class="dxck">计算机1</td>
<td class="dxck"><button class="sc" onclick="delnode(this)">删除</button></td>
</tr>
</tbody>
</table>
</div>
<div class="show_msg hide" id="show_msg">
<span class="xbnr">姓名:</span><input id="name" type="text" title="请输入姓名" placeholder="请输入姓名" ><br>
<span class="xbnr">年龄:</span><input id="age" type="text" title="请输入age" placeholder="请输入age"><br>
<span class="xbnr">专业:</span><input id="hobby" type="text" title="请输入专业" placeholder="请输入专业" ><br>
<button class="close1" id="close1">保存</button>
</div>
</body>
<script> let bt1 =document.getElementsByClassName("bt1")[0]; //加入信息按钮
let show_msg =document.getElementById("show_msg"); //加入内容界面
let close1 =document.getElementById("close1"); //关闭加入内容界面
let name =document.getElementById("name"); //名字
let age =document.getElementById("age"); //年龄
let hobby =document.getElementById("hobby"); //专业
let msg1 =document.getElementById("msg1") ;//获取展示内容父标签
bt1.onclick =function () {
show_msg.classList.remove("hide")
};
close1.onclick =function () {
show_msg.classList.add("hide");
namemsg= name.value;
agemsg =age.value;
hobbymsg =hobby.value;
let creatbody =document.createElement("tr"); //创建tr
let creatname =document.createElement("td"); //创建td
creatname.setAttribute("class","dxck"); //赋值css
creatname.innerHTML=namemsg; //给td 赋name value
let creatage =document.createElement("td"); //创建td
creatage.setAttribute("class","dxck");
creatage.innerHTML=agemsg; //赋值
let creathobby =document.createElement("td"); //创建td
creathobby.setAttribute("class","dxck");
creathobby.innerHTML=hobbymsg;
let creatclear =document.createElement("td"); //创建td
creatclear.setAttribute("class","dxck");
// creatclear.innerHTML="<button class=\"sc\" onclick=\"delnode(this)\">删除</button>"
let iupdel =document.createElement("button"); //创建button
iupdel.setAttribute("class","sc");
iupdel.setAttribute("onclick","delnode(this)");
iupdel.innerHTML="删除"; msg1.appendChild(creatbody); //在msg1 下增加tr标签
creatbody.appendChild(creatname); //在tr 标签下增加td
creatbody.appendChild(creatage); //
creatbody.appendChild(creathobby); //
creatbody.appendChild(creatclear); //
creatclear.appendChild(iupdel); //在td 标签内增加button
};
// let scmsg =document.getElementsByClassName("sc"); ///待解决
// for(let i=0;i>scmsg.length;i++){
//
// scmsg[i].onclick =function () {
// alert("zhans")
// }
// }
function delnode(inputNode) {
let trNode = inputNode.parentNode.parentNode;
let tbody =document.getElementsByTagName("tbody")[0];
tbody.removeChild(trNode)
} </script>
</html>
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