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Summary of how to get elements
1. Get the element based on the value of the id attribute and return it is an element object
document.getElementById("id属性的值"); document.getElementById("btn");
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2. Get the element based on the tag name and return It is a pseudo array that stores multiple DOM objects
document.getElementsByTagName("标签名字"); document.getElementsByTagName("li");
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3 . Obtain elements based on the value of the name attribute, and return a pseudo array, which stores multiple DOM objects
document.getElementsByName("name属性的值") document.getElementsByName("name1")
4. According to the class style To get the element by name, what is returned is a pseudo array, which stores multiple DOM objects
document.getElementsByClassName("类样式的名字") document.getElementsByClassName("cls")
5. Get the element according to the selector and return is an element object
document.querySelector("选择器的名字"); document.querySelector("#btn"); //id,类,标签等选择器用的比较多
6. Get the element according to the selector, and what is returned is a pseudo array, which stores multiple DOM objects
document.querySelectorAll("选择器的名字")
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