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Introduction to HTML DOM and new features

Introduction

  • In the core DOM, the properties and methods provided can already operate web pages. Why do we need HTMLDOM?

  • If in the core DOM, the node level in the web page is very deep, it will be very troublesome to access this node.

  • Then, HTMLDOM provides a method to directly find nodes by id, instead of starting from the HTML root node.

##New features of HTMLDOM

  • Each HTML tag corresponds to an element object. For example: <img> corresponds to an image object

  • . The attributes of each HTML tag correspond to the attributes of the corresponding element object in a one-to-one correspondence. 

    • <!DOCTYPE HTML>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
        <title>php.cn</title>
        <script type="text/javascript">
        window.onload = function(){
            //获取网页中id=img01的图片对象
            var imgObj = document.getElementById("img1");
            //修改图片的属性的值，图片标记的属性，元素对象也能用。
            imgObj.src = "/upload/course/000/000/009/580af7f52278b486.jpg";
            imgObj.width = 400;
            imgObj.border = 2;
            imgObj.style = "cursor:pointer";
            imgObj.title = "唯美图片";
            //核心DOM中的属性方法，元素对象都能用
            imgObj.parentNode.bgColor = "#f0f0f0";
        }
        </script>
    </head>
    <body >
        <img id="img1" src="/upload/course/000/000/009/580ae23c4a88a881.jpg" />
    </body>
</html>
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<!DOCTYPE HTML> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>php.cn</title> <script type="text/javascript"> window.onload = function(){ //获取网页中id=img01的图片对象 var imgObj = document.getElementById("img1"); //修改图片的属性的值，图片标记的属性，元素对象也能用。 imgObj.src = "/upload/course/000/000/009/580af7f52278b486.jpg"; imgObj.width = 400; imgObj.border = 2; imgObj.style = "cursor:pointer"; imgObj.title = "唯美图片"; //核心DOM中的属性方法，元素对象都能用 imgObj.parentNode.bgColor = "#f0f0f0"; } </script> </head> <body > <img id="img1" src="/upload/course/000/000/009/580ae23c4a88a881.jpg" /> </body> </html>
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