js知识点总结
@(前端)[初识JavaScript|实例练习]
1、左侧菜单
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
*{
margin: 0;
padding: 0;
}
.left{
width: 20%;
height: 500px;
float: left;
background-color: wheat;
}
.right{
float: left;
width: 80%;
height: 500px;
background-color: lightgray;
}
.title{
text-align: center;
line-height: 40px;
background-color: #0e90d2;
color: white;
}
.item{
padding: 10px;
}
.hide{
display: none;
}
</style>
</head>
<body>
<div class="outer">
<div class="left">
<div class="item">
<div class="title">菜单一</div>
<ul class="con">
<li>111</li>
<li>111</li>
<li>111</li>
</ul>
</div>
<div class="item">
<div class="title">菜单二</div>
<ul class="con hide">
<li>222</li>
<li>222</li>
<li>222</li>
</ul>
</div>
<div class="item">
<div class="title">菜单三</div>
<ul class="con hide">
<li>333</li>
<li>333</li>
<li>333</li>
</ul>
</div>
</div>
<div class="right"></div>
</div>
<script>
var eles_title=document.getElementsByClassName("title");
for (var i=0;i<eles_title.length;i++){
eles_title[i].onclick=function(){
this.nextElementSibling.classList.remove("hide");
for(var j=0;j<eles_title.length;j++){
if (eles_title[j]!=this){
eles_title[j].nextElementSibling.classList.add("hide")
}
}
}
}
</script>
</body>
</html>
2、搜索框
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script>
function Focus(){
var input=document.getElementById("ID1");
if (input.value=="请输入用户名"){
input.value="";
}
}
function Blurs(){
var ele=document.getElementById("ID1");
var val=ele.value;
if(!val.trim()){
ele.value="请输入用户名";
}
}
</script>
</head>
<body>
<input id="ID1" type="text" value="请输入用户名" onblur="Blurs()" onfocus="Focus()">
</body>
</html>
3、模态对话框
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
.back{
background-color: white;
height: 2000px;
}
.shade{
position: fixed;
top: 0;
bottom: 0;
left:0;
right: 0;
background-color: grey;
opacity: 0.4;
}
.hide{
display: none;
}
.models{
position: fixed;
top: 50%;
left: 50%;
margin-left: -100px;
margin-top: -100px;
height: 200px;
width: 200px;
background-color: wheat;
}
</style>
</head>
<body>
<div class="back">
<input class="c" type="button" value="click">
</div>
<div class="shade hide handles"></div>
<div class="models hide handles">
<input class="c" type="button" value="cancel">
</div>
<script>
var eles=document.getElementsByClassName("c");
var handles=document.getElementsByClassName("handles");
for(var i=0;i<eles.length;i++){
eles[i].onclick=function(){
if(this.value=="click"){
for(var j=0;j<handles.length;j++){
handles[j].classList.remove("hide");
}
}
else {
for(var j=0;j<handles.length;j++){
handles[j].classList.add("hide");
}
}
}
}
</script>
</body>
</html>
4、表格案例
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<button class="select_all">全选</button>
<button class="select_reverse">反选</button>
<button class="cancel">取消</button>
<hr>
<table class="server_table" border="2px" cellspacing="2px">
<tr>
<td><input type="checkbox" class="item"></td>
<td>111</td>
<td>111</td>
<td>111</td>
</tr>
<tr>
<td><input type="checkbox" class="item"></td>
<td>222</td>
<td>222</td>
<td>222</td>
</tr>
<tr>
<td><input type="checkbox" class="item"></td>
<td>333</td>
<td>333</td>
<td>333</td>
</tr>
<tr>
<td><input type="checkbox" class="item"></td>
<td>444</td>
<td>444</td>
<td>444</td>
</tr>
</table>
<script>
/*
var ele_all=document.getElementsByClassName("select_all")[0];
var ele_reverse=document.getElementsByClassName("select_reverse")[0];
var ele_cancel=document.getElementsByClassName("cancel")[0];
var input_arr=document.getElementsByClassName("item");
ele_all.onclick=function(){
for(var i=0;i<input_arr.length;i++){
console.log(input_arr[i]);
var input=input_arr[i];
input.checked=true;
}
};
ele_cancel.onclick=function(){
for(var i=0;i<input_arr.length;i++){
console.log(input_arr[i]);
var input=input_arr[i];
input.checked=false;
}
};
ele_reverse.onclick=function(){
for(var i=0;i<input_arr.length;i++){
console.log(input_arr[i]);
var input=input_arr[i];
if(input.checked){
input.checked=false;
}
else{
input.checked=true;
}
}
};
*/
var input_arr=document.getElementsByClassName("item");
var button_arr=document.getElementsByTagName("button");
for(var i=0;i<button_arr.length;i++){
button_arr[i].onclick=function(){
for (var j=0;j<input_arr.length;j++){
var inp=input_arr[j]
if(this.innerText=="全选"){
console.log("ok");
inp.checked=true;
}
else if(this.innerText=="取消"){
inp.checked=false;
}
else {
if(inp.checked){
inp.checked=false;
}else {
inp.checked=true;
}
}
}
}
}
</script>
</body>
</html>
5、select移动
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
.outer{
margin: 0 auto;
background-color: darkgray;
width: 80%;
height: 600px;margin-top: 30px;
word-spacing: -5px;
}
#left{
display: inline-block;
width: 100px ;
height: 140px;
background-color: wheat;
text-align: center;
}
#choice{
display: inline-block;
height: 140px;
background-color: darkolivegreen;
vertical-align: top;
padding:0 5px;
}
#choice button{
margin-top: 20px;
}
#right{
display: inline-block;
width: 100px ;
height: 140px;
background-color: wheat;
text-align: center;
line-height: 140px;
}
</style>
</head>
<body>
<div class="outer">
<select multiple="multiple" size="5" id="left">
<option>红楼梦</option>
<option>西游记</option>
<option>水浒传</option>
<option>JinPingMei</option>
<option>三国演义</option>
</select>
<span id="choice">
<button id="choose_move"> > </button><br>
<button id="all_move"> >> </button>
</span>
<select multiple="multiple" size="10" id="right">
<option>放风筝的人</option>
</select>
</div>
<script>
var choose_move=document.getElementById("choose_move");
var all_move=document.getElementById("all_move");
var right=document.getElementById("right");
var left=document.getElementById("left");
var options=left.options;
choose_move.onclick=function(){
for (var i=0; i<options.length;i++){
var option=options[i];
if(option.selected==true){
// var news=option.cloneNode(true);
// console.log(news);
right.appendChild(option);
i--;
}
}
};
all_move.onclick=function(){
for (var i=0; i<options.length;i++){
var option=options[i];
right.appendChild(option);
i--;
};
};
/*
var buttons=document.getElementsByTagName("button");
for(var i=0;i<buttons.length;i++) {
buttons[i].onclick = function () {
for (var i = 0; i < options.length; i++) {
var option = options[i];
if (this.innerText == ">") {
if (option.selected == true) {
// var news=option.cloneNode(true);
// console.log(news);
right.appendChild(option);
i--;
}
} else {
right.appendChild(option);
i--;
}
}
};
}
*/
</script>
</body>
</html>
6、二级联动
<select id="province">
<option>请选择省:</option>
</select>
<select id="city">
<option>请选择市:</option>
</select>
<script>
data={"河北省":["廊坊","邯郸"],"北京":["朝阳区","海淀区"]};
var p=document.getElementById("province");
var c=document.getElementById("city");
for(var i in data){
var option_pro=document.createElement("option");
option_pro.innerHTML=i;
p.appendChild(option_pro);
}
p.onchange=function(){
pro=(this.options[this.selectedIndex]).innerHTML;
citys=data[pro];
c.options.length=0;
for (var i in citys){
var option_city=document.createElement("option");
option_city.innerHTML=citys[i];
c.appendChild(option_city);
}
}
</script>
7、跑马灯与tab切换
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>tab</title>
<style>
*{margin:0; padding:0; list-style:none;}
body{
font-family: "Helvetica Neue", "Hiragino Sans GB", "Microsoft YaHei", "\9ED1\4F53", Arial, sans-serif;
}
h3{
text-align: center;
color:darkcyan;
margin-top: 30px;
letter-spacing: 5px;
}
.box{
width: 1000px;
margin:50px auto 0px;
}
#title{
line-height: 40px;
background-color: rgb(247,247,247);
font-size: 16px;
font-weight: bold;
color: rgb(102,102,102);
}
#title span{
float: left;
width: 166px;
text-align: center;
}
#title span:hover{
/*color: black;*/
cursor: pointer;
}
#content{
margin-top: 20px;
}
#content li{
width: 1050px;
display: none;
background-color: rgb(247,247,247);
}
#content li div{
width: 156px;
margin-right: 14px;
float: left;
text-align: center;
}
#content li div a{
font-size: 14px;
color: black;
line-height: 14px;
/* float: left;*/
display: inline-block;
margin-top: 10px;
}
#content li a:hover{
color: #B70606;
}
#content li div span{
font-size: 16px;
line-height: 16px;
/*float: left;*/
display: block;
color: rgb(102,102,102);
margin-top: 10px;
}
#content img{
float: left;
width: 155px;
height: 250px;
}
#title .select{
background-color: #2459a2;
color: white;
border-radius: 10%;
}
#content .show{
display: block;
}
.show span{
color: red!important;
font-size: 30px;
}
</style>
</head>
<body>
<h3 id="wel">京东商城欢迎您</h3>
<!-- direction="right up down left" -->
<!-- behavior：滚动方式(包括3个值：scroll、slide、alternate) -->
<!-- 说明：scroll：循环滚动，默认效果；slide：只滚动一次就停止；alternate：来回交替进行滚动。 -->
<!-- scrollamount="5" 滚动速度 -->
<marquee behavior="scroll" direction="right">欢迎您苑昊先生</marquee>
<script>
function test(){
var mywel = document.getElementById("wel");
var content = mywel.innerText;
var f_content = content.charAt(0);
var l_content = content.substring(1,content.length);
var new_content = l_content + f_content;
mywel.innerText = new_content;
}
// setInterval("test();", 500);
</script>
<div class="box">
<p id="title">
<span class="select">家用电器</span>
<span>家具</span>
<span>汽车</span>
<span>食品</span>
<span>女鞋</span>
<span>医疗保健</span>
</p>
<ul id="content">
<li class="show">
<div><img src="https://img10.360buyimg.com/n1/s450x450_jfs/t4786/325/2470647304/119102/9e1a4ed5/59005841Nd786a8df.jpg" alt="冰箱"><a href="#">容声(Ronshen)冰箱</a><span>价格:5600</span></div>
<div><img src="https://img12.360buyimg.com/n1/s450x450_jfs/t3037/347/1290968859/201366/7c1028a0/57c00194N9d0a54c6.jpg" alt="洗衣机"><a href="#">海尔洗衣机</a><span>价格:5400</span></div>
<div><img src="https://img11.360buyimg.com/n1/jfs/t3289/128/2393835119/236360/af1d283b/57e0f300N53dde603.jpg" alt="电饭煲"><a href="#">福库(CUCKOO)电饭煲</a><span>价格:3999</span></div>
<div><img src="https://img13.360buyimg.com/n1/jfs/t3235/137/2361713777/152258/a6908440/57e098c2N44a90a5d.jpg" alt="智能电视"><a href="#">三星智能电视</a><span>价格:8999</span></div>
<div><img src="https://img10.360buyimg.com/n1/jfs/t2053/101/1391591157/215066/572e131b/5696ee9bN2376492d.jpg" alt="净水器"><a href="#">净水器</a><span>价格:1300</span></div>
<div><img src="https://img14.360buyimg.com/n1/jfs/t3175/78/2357430273/262835/9a8e7f65/57e0a3e9Nbda39dd2.jpg" alt="空气净化器"><a href="#">空气净化器</a><span>价格:5300</span></div>
</li>
<li>
<div><img src="https://img12.360buyimg.com/n1/jfs/t1948/172/2877517581/556924/682eb107/56f63dc8Naddf77e5.jpg" alt="沙发"><a href="#">沙发</a><span>价格:2900</span></div>
<div><img src="https://img12.360buyimg.com/n1/jfs/t1948/172/2877517581/556924/682eb107/56f63dc8Naddf77e5.jpg" alt="沙发"><a href="#">沙发</a><span>价格:2900</span></div>
<div><img src="https://img12.360buyimg.com/n1/jfs/t1948/172/2877517581/556924/682eb107/56f63dc8Naddf77e5.jpg" alt="沙发"><a href="#">沙发</a><span>价格:2900</span></div>
<div><img src="https://img12.360buyimg.com/n1/jfs/t1948/172/2877517581/556924/682eb107/56f63dc8Naddf77e5.jpg" alt="沙发"><a href="#">沙发</a><span>价格:2900</span></div>
<div><img src="https://img12.360buyimg.com/n1/jfs/t1948/172/2877517581/556924/682eb107/56f63dc8Naddf77e5.jpg" alt="沙发"><a href="#">沙发</a><span>价格:2900</span></div>
<div><img src="https://img12.360buyimg.com/n1/jfs/t1948/172/2877517581/556924/682eb107/56f63dc8Naddf77e5.jpg" alt="沙发"><a href="#">沙发</a><span>价格:2900</span></div>
</li>
<li>
<div><img src="http://img11.360buyimg.com/n1/jfs/t4969/76/45396935/144539/347153d4/58d9cff4N36872ad6.jpg" alt="长安汽车"><a href="#">长安汽车</a><span>价格:12900</span></div>
<div><img src="http://img11.360buyimg.com/n1/jfs/t4969/76/45396935/144539/347153d4/58d9cff4N36872ad6.jpg" alt="长安汽车"><a href="#">长安汽车</a><span>价格:12900</span></div>
<div><img src="http://img11.360buyimg.com/n1/jfs/t4969/76/45396935/144539/347153d4/58d9cff4N36872ad6.jpg" alt="长安汽车"><a href="#">长安汽车</a><span>价格:12900</span></div>
<div><img src="http://img11.360buyimg.com/n1/jfs/t4969/76/45396935/144539/347153d4/58d9cff4N36872ad6.jpg" alt="长安汽车"><a href="#">长安汽车</a><span>价格:12900</span></div>
<div><img src="http://img11.360buyimg.com/n1/jfs/t4969/76/45396935/144539/347153d4/58d9cff4N36872ad6.jpg" alt="长安汽车"><a href="#">长安汽车</a><span>价格:12900</span></div>
<div><img src="http://img11.360buyimg.com/n1/jfs/t4969/76/45396935/144539/347153d4/58d9cff4N36872ad6.jpg" alt="长安汽车"><a href="#">长安汽车</a><span>价格:12900</span></div>
</li>
<li>
<div><img src="https://img14.360buyimg.com/n1/jfs/t4414/110/2582917360/207971/b7e129ad/58f0ee1fN94425de1.jpg" alt="嘉兴粽子"><a href="#">嘉兴粽子</a><span>价格:1</span></div>
<div><img src="https://img14.360buyimg.com/n1/jfs/t4414/110/2582917360/207971/b7e129ad/58f0ee1fN94425de1.jpg" alt="嘉兴粽子"><a href="#">嘉兴粽子</a><span>价格:1</span></div>
<div><img src="https://img14.360buyimg.com/n1/jfs/t4414/110/2582917360/207971/b7e129ad/58f0ee1fN94425de1.jpg" alt="嘉兴粽子"><a href="#">嘉兴粽子</a><span>价格:1</span></div>
<div><img src="https://img14.360buyimg.com/n1/jfs/t4414/110/2582917360/207971/b7e129ad/58f0ee1fN94425de1.jpg" alt="嘉兴粽子"><a href="#">嘉兴粽子</a><span>价格:1</span></div>
<div><img src="https://img14.360buyimg.com/n1/jfs/t4414/110/2582917360/207971/b7e129ad/58f0ee1fN94425de1.jpg" alt="嘉兴粽子"><a href="#">嘉兴粽子</a><span>价格:1</span></div>
<div><img src="https://img14.360buyimg.com/n1/jfs/t4414/110/2582917360/207971/b7e129ad/58f0ee1fN94425de1.jpg" alt="嘉兴粽子"><a href="#">嘉兴粽子</a><span>价格:1</span></div>
</li>
<li>
<div><img src="https://img14.360buyimg.com/n1/jfs/t3079/298/5759209435/92674/14818594/587f1c33N53e5d2a9.jpg" alt="星期六"><a href="#">星期六</a><span>价格:439</span></div>
<div><img src="https://img14.360buyimg.com/n1/jfs/t3079/298/5759209435/92674/14818594/587f1c33N53e5d2a9.jpg" alt="星期六"><a href="#">星期六</a><span>价格:439</span></div>
<div><img src="https://img14.360buyimg.com/n1/jfs/t3079/298/5759209435/92674/14818594/587f1c33N53e5d2a9.jpg" alt="星期六"><a href="#">星期六</a><span>价格:439</span></div>
<div><img src="https://img14.360buyimg.com/n1/jfs/t3079/298/5759209435/92674/14818594/587f1c33N53e5d2a9.jpg" alt="星期六"><a href="#">星期六</a><span>价格:439</span></div>
<div><img src="https://img14.360buyimg.com/n1/jfs/t3079/298/5759209435/92674/14818594/587f1c33N53e5d2a9.jpg" alt="星期六"><a href="#">星期六</a><span>价格:439</span></div>
<div><img src="https://img14.360buyimg.com/n1/jfs/t3079/298/5759209435/92674/14818594/587f1c33N53e5d2a9.jpg" alt="星期六"><a href="#">星期六</a><span>价格:439</span></div>
</li>
<li>
<div><img src="https://img12.360buyimg.com/n1/jfs/t5755/127/1139389729/356866/99d4e869/5923e410Nb2983f70.jpg" alt="汇仁 肾宝片"><a href="#">汇仁 肾宝片</a><span>价格:322</span></div>
<div><img src="https://img12.360buyimg.com/n1/jfs/t5755/127/1139389729/356866/99d4e869/5923e410Nb2983f70.jpg" alt="汇仁 肾宝片"><a href="#">汇仁 肾宝片</a><span>价格:322</span></div>
<div><img src="https://img12.360buyimg.com/n1/jfs/t5755/127/1139389729/356866/99d4e869/5923e410Nb2983f70.jpg" alt="汇仁 肾宝片"><a href="#">汇仁 肾宝片</a><span>价格:322</span></div>
<div><img src="https://img12.360buyimg.com/n1/jfs/t5755/127/1139389729/356866/99d4e869/5923e410Nb2983f70.jpg" alt="汇仁 肾宝片"><a href="#">汇仁 肾宝片</a><span>价格:322</span></div>
<div><img src="https://img12.360buyimg.com/n1/jfs/t5755/127/1139389729/356866/99d4e869/5923e410Nb2983f70.jpg" alt="汇仁 肾宝片"><a href="#">汇仁 肾宝片</a><span>价格:322</span></div>
<div><img src="https://img12.360buyimg.com/n1/jfs/t5755/127/1139389729/356866/99d4e869/5923e410Nb2983f70.jpg" alt="汇仁 肾宝片"><a href="#">汇仁 肾宝片</a><span>价格:322</span></div>
</li>
</ul>
</div>
<script>
var title=document.getElementById('title');
var content=document.getElementById('content');
var category=title.getElementsByTagName('span');
var item=content.getElementsByTagName('li');
for (var i = 0; i < category.length; i++) {
category[i].index=i;
category[i].onclick=function(){
for (var j = 0; j < category.length; j++) {
category[j].className='';
item[j].className='';
}
this.className='select';
item[this.index].className='show';
}
}
</script>
</body>
</html>
知识点总结
html css jS
1、JS基础知识
ECMA DOM BOM
python :
(1) 定义变量
(2) 数据类型：整型，浮点型，字符串，列表，字典
(3) 运算符：
计算运算符 + - * / %
逻辑运算符 and or not
比较运算符 > < == !=
身份运算符 is
(4) 流程控制：
1、顺序执行
2、分支结构
3、循环语句
(5) 函数
(6) 面向对象
ECMA：
关于JS的引入方式：
定义变量：var x; x=12
数据类型：
基本数据类型：
number：12，2,3,3423，234,345345,3.45,45.45
string:"",''
bool：true，false
引用数据类型：
数组 ： []
object: {"":""}
对象 ： Math，Date....
流程控制语句：
in Python：
if 3>2:
语句体
else：
语句体
in js：
if(表达式){
语句体
}
else if(表达式){
语句体
}
else{
语句体
}
while 循环：
var count=0;
while (count<100){
console.log(count);
count++;
}
for(var i=0;i<4;i++){}
for(var i in 序列类型对象){
}
函数：
def 函数名(参数,...):
函数体
定义：
function 函数名(参数,....){
// arguments : 存放所有的实参
函数体
return // 默认undefined
}
调用： 函数名(参数)
**********每一个标签都是一个对象
BOM：browser object model
ID=setInterval(foo,1000) 按照指定的周期（以毫秒计）来调用函数或计算表达式。
clearInterval() 取消由 setInterval() 设置的 timeout。
setTimeout(foo,1000) 在指定的毫秒数后调用函数或计算表达式。
clearTimeout() 取消由 setTimeout() 方法设置的 timeout。
2、Jquery操作（******）
事件：绑定事件
1、查找标签
参考jquery选择器
直接查找标签：
基本选择器： $("element") $(".class") $("#id") $(".class *")
组合选择器： $(".class .item") $(".class>.item")
$(".class~.item") $(".class+.item")
属性选择器: $("[属性名='属性值']")
表单选择器： $(":text") // 仅仅适合于表单标签
筛选器：
$("p").eq(2)
导航查找(在一个标签的基础上去定位其他关系标签)
1、找子代： $("").children("条件") $("").find("条件")
2、找兄弟：
$().next()
$().nextAll()
$().nextUntil()
$().prev()
$().siblings() (*****)
3、找父亲 :
$().parent()
$().parents()
$().parentsUntil()
2、操作标签
文本操作
文本取值操作
$().html()
$().text()
文本赋值操作
$().html("")
$().text("")
属性操作（****************）：
$().attr(属性名)
$().attr(属性名, 属性值)
// 针对 checked select
$().prop(属性名)
$().prop(属性名, 属性值)
// $(":checkbox").prop("checked",false)
class操作
$("").addClass(class|fn)
$("").removeClass([class|fn])
value操作
适用于：
input
textarea
select
取值操作：
$("").val()
赋值操作：
$("").val("")
节点操作（Node*********************）：
每一个标签对象（Dom对象）都是一个节点对象
Dom对象与jquery对象转换
(1) 创建节点对象
$("<标签名>")
(1) 添加节点操作
$(父标签).append(添加的子标签)
$img.appendTo(".outer")
$(".outer").after($img)
css操作:
offset:获取匹配元素在当前视口的相对偏移。
3 事件
绑定事件 on
具体事件：
click
dbclick
Bootstrap:
官方文档
基于bootstrap设计一个表格的增删编辑！
