一、字符串常用的方法
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obj.length 长度
obj.trim() 移除前后空白
obj.trimLeft() 移除前空白
obj.trimRight() 移除后空白
obj.charAt(n) 返回字符串中的第n个字符
obj.concat(value, …) 拼接
obj.indexOf(substring,start) 子序列位置
obj.substring(from, to) 根据索引获取子序列
obj.slice(start, end) 切片
obj.toLowerCase() 大写
obj.toUpperCase() 小写
obj.split(delimiter, limit) 分割
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二、数组常用的方法
1.obj.length 数组的大小
2.obj.push(ele) 尾部追加元素
3.obj.pop() 尾部获取一个元素
4.obj.unshift(ele)头部插入元素
5.obj.shift() 头部移出元素
6.obj.reverse() 反转
7.obj.join() 将数组元素链接起来构建一个字符串
8.obj.concat(val...) 连接数组
9.obj.sort() 对数组元素进行排序
三、属性方法
var s="hello world";
console.log(s.length);
console.log(s.toUpperCase());
console.log(s.charAt(3));// 通过索引获取字符
console.log(s.indexOf("w"));// 通过字符获取索引
console.log(s.substr(1,3));// 字符串截断，substr(起始位置,截断长度)
console.log(s.substring(1,3));// 字符串截断，substr(起始位置,截断位置)
console.log(s.slice(1,3));// 字符串截断，substr(起始位置,截断位置)
<!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>
左侧菜单
<!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>
搜索框
<!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>
模态对话框
<!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>
表格案例（全选，反选，取消）
<!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>
跑马灯与tab的切换
<!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>*Mei</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>
select的移动
四、css(层叠样式表)： 对html标签的渲染和布局
1 、查找标签
选择器
基本选择器
组合选择器
属性选择器
2 、操作标签 （属性操作）
文本操
innerText 取值操作
块级标签：可以设置长和高，内联标签不可以
3、选择优先级
!important
规则内：
内嵌>id(100)>class(10)>element(1)
if 优先级相同，按加载顺序
4、继承：
优先级级别最低
继承字体相关样式
5、布局关键点： 如何能让可以调节长宽的元素（标签）在一行显示
6、float：半脱离文档流
position：fixed ： 完全脱离文档流，固定定位 以科室窗口为参照物 可以使用top left进行定位
position:relative : 不脱离文档流 以自己原位置作为参照物， 可以使用top left进行定位
position:absolute : 完全脱离文档流, 以已经定位了的父标签作为参照物 可以使用top left进行定位
将定位标签设置为absolute，将父级标签设置为定位标签（relative）
五、JS操作
事件操作：
onclick 当用户点击某个对象时调用的事件句柄。
ondblclick 当用户双击某个对象时调用的事件句柄。 onfocus 元素获得焦点。 练习：输入框
onblur 元素失去焦点。 应用场景：用于表单验证,用户离开某个输入框时,代表已经输入完了,我们可以对它进行验证.
onchange 域的内容被改变。 应用场景：通常用于表单元素,当元素内容被改变时触发.（三级联动） onkeydown 某个键盘按键被按下。 应用场景: 当用户在最后一个输入框按下回车按键时,表单提交.
onkeypress 某个键盘按键被按下并松开。
onkeyup 某个键盘按键被松开。 onload 一张页面或一幅图像完成加载。 onmousedown 鼠标按钮被按下。
onmousemove 鼠标被移动。
onmouseout 鼠标从某元素移开。
onmouseover 鼠标移到某元素之上。
onmouseleave 鼠标从元素离开 onselect 文本被选中。
onsubmit 确认按钮被点击。
事件操作
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body> <ul>
<li>111</li>
<li>222</li>
<li>333</li> </ul> <button>Add</button> <script> var eles_li=document.getElementsByTagName("li");
var ele_btn=document.getElementsByTagName("button")[0];
var ele_ul=document.getElementsByTagName("ul")[0];
// 添加li
ele_btn.onclick=function () {
var ele_li=document.createElement("li");
ele_li.innerHTML=444;
ele_ul.appendChild(ele_li)
}; // 绑定事件
for(var i=0;i<eles_li.length;i++){
eles_li[i].onclick=function () {
alert(this.innerHTML)
}
} // 事件委派 // ele_ul.addEventListener("click",function (e) {
// console.log(e.target); // 标签
// console.log(e.target.tagName); // 标签名称
//
// if(e.target.tagName=="LI"){
// console.log("OK")
// }
// }) </script>
</body>
</html>
事件委派
!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<input id="ID1" type="text" onclick="begin()">
<button onclick="end()">停止</button>
<script>
function showTime(){
var nowd2=new Date().toLocaleString();
var temp=document.getElementById("ID1");
temp.value=nowd2;
}
var ID;
function begin(){
if (ID==undefined){
showTime();
ID=setInterval(showTime,1000);
}
}
function end(){
clearInterval(ID);
ID=undefined;
}
</script> </body>
</html>
时间框
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body> <script>
var s=12;
function f(){
console.log(s); // undefined
var s=12; //
console.log(s) //
}
f(); </script> </body>
</html>
作用域链