s19.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<div id="i1">我是i1</div>
<a>adsf</a>
<a>909</a>
<a>ksdsd</a>
</body>
</html>
document.getElementsByTagName('span') 通过标签种类来获取标签
document.getElementsByClassName('c1') 通过css种类来获取标签
tag=document.getElementById('i1') #通过id 来获取标签
tag.innerText 获取标签内容
tag.innertext="新内容" 修改标签内容
document.getElementsByTagName('a')[1].innerText=666 a标签的第1个a标签的内容改成666
批量修改标签
tage=document.getElementsByTagName('a')
for(var i=0;i<tage.length;i++){tage[i].innerText=999;}
s20.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<div>
<div></div>
<div>c1</div>
</div>
<div>
<div></div>
<div id="i1">c2</div>
</div>
<div>
<div></div>
<div>c3</div>
</div>
</body>
</html>
tag=document.getElementById('i1'); 通过i1来查找其他标签
tag.parentElement i1对应标签的父标签
tag.parentElement，children i1对应标签的父标签的子标签
tag.parentElement.previousElementSibling 父标签的前一个标签
tag.parentElement.previousElementSibling.children[1] 父标签的前一个标签的子标签下的第1个标签
tag.parentElement.previousElementSibling.children[1].innerText 获取父标签的前一个标签的子标签下的第1个标签的标签内容
tag.parentElement.previousElementSibling.children[1].innerText="c1_1" 修改父标签的前一个标签的子标签下的第1个标签的标签内容
tag.className="c1" 添加class 整体操作
tag.className="c2" 修改class 整体操作
tag.classList 以列表的展现形式找出该标签所有的class
tag.classList.add('c3') 添加class 样式
tag.classList.remove('c2') 移除指定class 样式
<div onclick="func();">点击执行</div> 点这个div 就会执行func() javascript函数
<script>
function func() {
}
</script>
s21.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
.hide {
display: none;
}
.c1 {
position: fixed;
left: 0;
top: 0;
right: 0;
bottom: 0;
background-color: black;
opacity: 0.6;
z-index: 9;
}
.c2 {
width: 500px;
height: 400px;
background-color: white;
position: fixed;
left: 50%;
top: 50%;
margin-left: -250px;
margin-top: -300px;
z-index: 10;
}
</style>
</head>
<body style="margin: 0;">
<div>
<input type="button" value="添加" onclick="ShowMode();">
<input type="button" value="全选" onclick="ChooseAll();">
<input type="button" value="取消" onclick="CancleAll();">
<input type="button" value="反选" onclick="ReverseAll();">
<table>
<thead>
<tr>
<th>请选择</th>
<th>主机名</th>
<th>端口</th>
</tr>
</thead>
<tbody id="tb">
<tr>
<td><input type="checkbox"/></td>
<td>1.1.1.1</td>
<td>90</td>
</tr>
<tr>
<td><input type="checkbox"/></td>
<td>1.1.1.2</td>
<td>92</td>
</tr>
<tr>
<td><input type="checkbox"/></td>
<td>1.1.1.3</td>
<td>93</td>
</tr>
</tbody>
</table>
</div>
<!--遮罩层开始-->
<div id="i1" class="c1 hide"></div>
<!--遮罩层结束-->
<!--弹出框开始-->
<div id="i2" class="c2 hide">
<p><input type="text"/></p>
<p><input type="text"/></p>
<p>
<input type="button" value="取消" onclick="HideMode();"/>
<input type="button" value="确定"/>
</p>
</div>
<!--弹出框结束-->
<script>
function ShowMode() {
document.getElementById('i1').classList.remove('hide');
document.getElementById('i2').classList.remove('hide');
}
function HideMode() {
document.getElementById('i1').classList.add('hide');
document.getElementById('i2').classList.add('hide');
}
function ChooseAll() {
var tbody = document.getElementById('tb');
//获取所有的tr
var tr_list = tbody.children;
for (var i = 0; i < tr_list.length; i++) {
//循环所有的current_tr
var current_tr = tr_list[i];
var checkbox = current_tr.children[0].children[0];
checkbox.checked = true;
}}
function CancleAll() {
var tbody = document.getElementById('tb');
//获取所有的tr
var tr_list = tbody.children;
for (var i = 0; i < tr_list.length; i++) {
//循环所有的current_tr
var current_tr = tr_list[i];
var checkbox = current_tr.children[0].children[0];
checkbox.checked = false;
}}
function ReverseAll() {
var tbody = document.getElementById('tb');
//获取所有的tr
var tr_list = tbody.children;
for (var i = 0; i < tr_list.length; i++) {
//循环所有的current_tr
var current_tr = tr_list[i];
var checkbox = current_tr.children[0].children[0];
if(checkbox.checked){
checkbox.checked=false;
}else {checkbox.checked=true;}
}}
</script>
</body>
</html>
s22.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
.hide{
display: none;
}
.item .header{
height: 35px;
background-color: #2459a2;
color: white;
line-height: 35px;
}
</style>
</head>
<body>
<div style="height: 48px;"></div>
<div style="width: 300px;">
<div class="item">
<div id="i1" class="header" onclick="ChangeMenu('i1');">菜单1</div>
<div class="content">
<div>内容1</div>
<div>内容1</div>
<div>内容1</div>
</div>
</div>
<div class="item">
<div id="i2" class="header" onclick="ChangeMenu('i2');">菜单2</div>
<div class="content hide">
<div>内容2</div>
<div>内容2</div>
<div>内容2</div>
</div>
</div>
<div class="item">
<div id="i3" class="header" onclick="ChangeMenu('i3');" >菜单3</div>
<div class="content hide">
<div>内容3</div>
<div>内容3</div>
<div>内容3</div>
</div>
</div>
<div class="item">
<div id="i4" class="header" onclick="ChangeMenu('i4');" >菜单4</div>
<div class="content hide">
<div>内容4</div>
<div>内容4</div>
<div>内容4</div>
</div>
</div>
</div>
<script>
function ChangeMenu(nid) {
var current_header=document.getElementById(nid);
var item_list=current_header.parentElement.parentElement.children;
for (var i=0;i<item_list.length;i++){
var current_item=item_list[i];
current_item.children[1].classList.add('hide');
}
current_header.nextElementSibling.classList.remove('hide');
}
</script>
</body>
</html>