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本文小編為大家詳細介紹“Python的dom節點怎么獲取”，內容詳細，步驟清晰，細節處理妥當，希望這篇“Python的dom節點怎么獲取”文章能幫助大家解決疑惑，下面跟著小編的思路慢慢深入，一起來學習新知識吧。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>DOM document object model 文檔頂級節點</title>
</head>
<body>
<div id="box">
<p class="p1" >張三</p>
<p class="p2">李四</p>
<p class="p3">趙劉</p>
<p name="ceshi1"></p>
<p name="ceshi1"></p>
</div>
<div>
<input type="text" name="username" />
<input type="password" name="pwd" />
<p1>112233</p1>
<box>55666</box>
</div>
<script>
console.log(document)
// ### 1 通過id獲取div節點對象
var box = document.getElementById("box");
console.log(box);
// ### 2 通過類名獲取節點對象 [返回的是數組]
var p2 = document.getElementsByClassName("p2");
console.log(p2 , typeof(p2));
// 獲取李四節點對象
lisi = p2[0];
console.log(lisi)
// 獲取王五節點對象
wangwu = p2[1];
console.log(wangwu);
// ### 3.通過標簽獲取節點對象 [返回的是數組]
var p = document.getElementsByTagName("p");
console.log(p)
console.log(p[1])
// ### 4.通過標簽身上的name屬性 [返回的是數組] 一般用在input表單中
var ceshi1 = document.getElementsByName("username")[0];
console.log(ceshi1);
// ### 通過css選擇器獲取對應的元素節點
// ### 5.querySelector ,只獲取找到的第一個;
var p1 = document.querySelector(".p1");
console.log(p1)
var box = document.querySelector("#box");
console.log(box)
// input表單有兩個,但是只獲取第一個;
var input = document.querySelector("input");
console.log(input);
// ### 6.querySelectorAll 獲取所有找到的元素節點,返回數組
var all = document.querySelectorAll("input[name=username]")[0];
console.log(all);
</script>
</body>
</html><!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>節點元素層級關系</title> </head> <body> <div id="box"> <p> <input type="text" name="username" /> <input type="password" name="pwd" /> </p> <p class="p1" >張三</p> <p class="p2">李四</p> <p class="p3">趙劉</p> <p name="ceshi1"></p> <p name="ceshi1"></p> </div> <script> // ### 獲取對應的節點元素 console.log(document) console.log(document.documentElement); // html console.log(document.documentElement.children) // 找html里面所有的子節點children var html_children = document.documentElement.children console.log(html_children) // head , body body = html_children[1]; console.log(body); // head , body var div = body.children[0] console.log(div); var p0 = div.children[0] console.log(p0) var input = p0.children console.log(input) var input1 = input[0] console.log(input1) // 獲取下一個節點對象nextSibling console.log(input1.nextSibling.nextSibling); // 獲取下一個元素節點對象 nextElementSibling var input2 = input1.nextElementSibling; console.log(input2); // 獲取上一個節點對象 previousSibling console.log(input2.previousSibling) // 獲取上一個元素節點對象 previousElementSibling console.log(input2.previousElementSibling) // 獲取input2父節點元素對象; console.log(input2.parentElement) </script> </body> </html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>DOM 修改/清空內容</title>
</head>
<body>
<button onclick="func1()">修改內容</button>
<button onclick="func2()">清空內容</button>
<div id="box" >
<p>我是最帥的最有錢的<a href="#">最有味的</a>男人</p>
</div>
<script>
// innerHTML 獲取標簽里面所有內容 [標簽 + 文本]
// innerText 獲取標簽里面所有字符串[文本]
var p = document.querySelector("#box p");
// console.log把數據展現在控制臺
console.log(p);
// document.write 把數據以字符串的形式展現在瀏覽器
document.write(p);
// 點擊button1觸發如下任務 , 修改
function func1(){
var content = p.innerHTML;
var content = p.innerText;
console.log(content);
// p.innerHTML = `我被修改了 <a href=''>點我中大獎</a>...1`;
p.innerText = `我被修改了 <a href=''>點我中大獎</a>...2`;
}
// 點擊button2觸發如下任務 , 清空
function func2(){
p.innerHTML = '';
}
</script>
</body>
</html><!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>隱藏顯示密碼效果</title>
</head>
<body>
<input type="password" name="pwd" value="111" class="abcd" /> <button onclick="change()" id="btn" >點我顯示密碼</button>
<div>
<img src="images/oneal1.jpg" />
</div>
<script>
// 效果1: 顯示隱藏密碼
var password = document.querySelector("input[name=pwd]")
console.log(password);
console.log(password.type);
console.log(password.name);
console.log(password.value);
console.log(password.className)
function change(){
var btn = document.querySelector("#btn")
console.log(btn);
if(password.type=="password"){
password.type = "text";
btn.innerHTML = "點我隱藏密碼";
}else{
password.type= "password";
btn.innerHTML = "點我顯示密碼";
}
}
// 效果2:點擊換圖片
var img = document.querySelector("img");
console.log(img)
img.onclick = function(){
console.log(img.src) // http://127.0.0.1:5500/images/oneal1.jpg
var arr = img.src.split("/")
imgname = arr[arr.length - 1]
console.log(arr , imgname);
if(imgname == "oneal1.jpg"){
img.src = "images/bakeli.jpg";
}else{
img.src = "images/oneal1.jpg";
}
}
</script>
</body>
</html><!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>全選,反選,不選</title>
<style>
*
{margin:0px;padding:0px;}
ul
{list-style: none;}
#ul1 li
{float:left;}
#ul1 li button
{width:80px;height:30px;}
#ul1 li button:hover
{background-color: tan;}
#ul2
{clear:both;}
</style>
</head>
<body>
<ul id="ul1">
<li><button>全選</button></li>
<li><button>不選</button></li>
<li><button>反選</button></li>
</ul>
<ul id="ul2">
<li><input type="checkbox" /> 看電影 </li>
<li><input type="checkbox" /> 吃面 </li>
<li><input type="checkbox" /> 燙頭 </li>
<li><input type="checkbox" /> 跑步 </li>
<li><input type="checkbox" /> 籃球 </li>
</ul>
<script>
// 獲取btn節點對象
var btn1 = document.querySelector("#ul1 li:nth-child(1) button");
var btn2 = document.querySelector("#ul1 li:nth-child(2) button");
var btn3 = document.querySelector("#ul1 li:nth-child(3) button");
// 全選
btn1.onclick = function(){
// 獲取#ul2 li 里的input
/*
var data_lst = document.getElementById("ul2").getElementsByTagName("input");
console.log(data_lst)
*/
var data_lst = document.querySelectorAll("#ul2 li input");
console.log(data_lst)
// 獲取數組當中每一個input節點元素對象
for(var input of data_lst){
//console.log(input.checked)
// 設置節點input的checked屬性為true;
input.checked = true;
}
}
// 不選
btn2.onclick = function(){
var data_lst = document.querySelectorAll("#ul2 li input");
console.log(data_lst)
// 獲取數組當中每一個input節點元素對象
for(var input of data_lst){
//console.log(input.checked)
// 設置節點input的checked屬性為true;
input.checked = false;
}
}
// 反選
btn3.onclick = function(){
var data_lst = document.querySelectorAll("#ul2 li input");
console.log(data_lst)
// 獲取數組當中每一個input節點元素對象
for(var input of data_lst){
if(input.checked === true){
input.checked = false;
}else{
input.checked = true;
}
}
}
</script>
</body>
</html><!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>js控制css的相關屬性</title>
<style>
.box
{border:solid 1px red;}
.box_new
{position: absolute; left:200px;}
</style>
</head>
<body>
<button id="box1">點擊我換顏色</button>
<button id="box2">點擊我隱藏</button>
<button id="box3">點擊我顯示</button>
<button id="box4">點擊邊框換圓角</button>
<button id="box5">點擊加樣式</button>
<div class="box" >你好評</div>
<script>
var box = document.querySelector(".box");
console.log(box);
// js的dom對象獲取相關的css屬性
// 獲取方法一
console.log(box.style.width);
console.log(box.style.backgroundColor);
// 獲取方法二
console.log(box.style["width"]);
console.log(box.style["background-color"]);
console.log(box.style["font-size"]);
// 獲取方法三 getComputedStyle 獲取該節點對象的所有樣式
console.log( window.getComputedStyle(box)["font-size"] , "<===getComputedStyle===>");
console.log( window.getComputedStyle(box).fontSize , "<===getComputedStyle===>");
// 事件綁定
var box1 = document.getElementById("box1");
var box2 = document.getElementById("box2");
var box3 = document.getElementById("box3");
var box4 = document.getElementById("box4");
var box5 = document.getElementById("box5");
box1.onclick = function(){
box.style.backgroundColor = "red";
}
box2.onclick = function(){
box.style.display = "none";
}
box3.onclick = function(){
box.style.display = "block";
}
box4.onclick = function(){
//box.style.borderRadius = "100%";
var point = 0;
var t = setInterval( function(){
box.style.borderRadius = `${point}%`;
if(point < 100){
point++;
}else{
clearInterval(t)
console.log("結束了... ")
}
} , 50)
}
/* 重點 添加樣式*/
box5.onclick = function(){
// box.className = "box box_new";
box.className += " box_new";
}
</script>
</body>
</html><!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>js事件</title>
<style>
*{margin:0px;padding:0px;}
.box
{width:100px;height:100px;background: green;position: absolute;left:0px;}
</style>
</head>
<body>
<!-- 1.事件的靜態綁定 -->
<button onclick="func1()">按鈕1</button>
<div class="box"></div>
<script>
var box = document.getElementsByClassName("box")[0];
var t;
console.log(box);
function func1(){
var left = parseInt(window.getComputedStyle(box).left)
console.log(left ,typeof(left));
// console.log(box.style.left);
t = setInterval(function(){
left += 10;
box.style.left = `${left}px`;
} , 50)
}
// 2.事件的動態綁定
// onmouseover 鼠標指針懸停在指定元素上時觸發
box.onmouseover = function(){
clearInterval(t);
}
// onmouseout 鼠標指針離開指定元素時觸發
box.onmouseout = function(){
func1()
}
</script>
</body>
</html><!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>模態框</title>
<style>
.box {
position:fixed;
width:100%;
height:100%;
top:0px;
background-color: greenyellow;
display: none;
}
.content
{
border:solid 1px red;
width:500px;
height:500px;
background-color:tan;
margin:auto;
margin-top:14%;
}
</style>
</head>
<body>
<button id="login">登錄</button>
<div class="box">
<div class="content" >
<span class="close">X</span>
<br />
<span>賬號: <input type="text" /></span>
<br / >
<span>密碼: <input type="password" /></span>
</div>
</div>
<script>
var btn = document.getElementById("login");
var box = document.querySelector(".box");
var close = document.querySelector(".close");
btn.onclick = function(){
console.log(11)
box.style.display = "block";
}
close.onclick = function(){
box.style.display = "none";
}
</script>
</body>
</html>讀到這里，這篇“Python的dom節點怎么獲取”文章已經介紹完畢，想要掌握這篇文章的知識點還需要大家自己動手實踐使用過才能領會，如果想了解更多相關內容的文章，歡迎關注億速云行業資訊頻道。
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