js tutorial--dom code to get elements
Get elements:
document.getElementsByClassName ('class') Get elements by class name, as array of classes Form exists. getElementsByTagName
document.querySelector('selector') Gets the element through the CSS selector, the 1 that meets the matching conditions element.
document.querySelectorAll('selector') Gets elements through CSS selectors, in an array-like form.
- ## Class name operation:
- Node.classList. add('class') Add class
- Node.classList.remove('class') Remove class
- Node.classList.toggle ('class') Switch the class, remove it if it exists, add it if it doesn't
- Node.classList.contains('class') Check whether the class exists
- Custom attributes:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
.red{
color: red;
}
.green{
color: green;
}
.blue{
color: blue;
}
</style>
</head>
<body>
<ul>
<li>请选择</li>
<li class="red">前端</li>
<li class="green">java</li>
<li class="blue">javascript</li>
<li id="c">c++</li>
</ul>
<script>
/*获取第一个li标签*/
window.onload=function(){
/*ElementsByTagName获取的是数组*/
/*索引：不直观 以后的数据都是从后台动态获取，前台动态生成添加*/
/*var cli=document.getElementsByTagName("li")[1];
console.log(cli);*/
/*query:查询 Selector：选择器 querySelector(传入选择器名称)*/
/*querySelector:获取单个元素，如果获取的元素不止一个，那么只会返回满足条件的第一个元素*/
/*参数要求：如果是类选择器，必须添加. 如果是id选择器， 必须添加# ,否则当成标签处理*/
var javaLi=document.querySelector(".green");
//var javaLi=document.querySelector("#c");
console.log(javaLi);
/*querySelectorAll获取满足条件的所有元素--数组*/
var allLi=document.querySelectorAll("li")[0];
console.log(allLi);
}
</script>
</body>
</html>Native js gets the dom element in the iframe--the parent and child pages get each other's dom
How to get the DOM element in js
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