Fore_End/JavaScript/DOM/09_HTMLDOM.html

<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>HTMLDOM</title>

        <style>
            .d1{
                   border: 1px solid red;
                   width: 100px;
                   height: 100px;
            }

            .d2{
                   border: 1px solid blue;
                   width: 200px;
                   height: 200px;
            }

        </style>
    </head>
    <body>
        <div id="div1">
            div1
        </div>

        <div id="div2">
            div2
        </div>

        <script>

            var div1 = document.getElementById("div1");
            var innerHTML = div1.innerHTML;

            //1、获取标签体内容
            alert(innerHTML);

            //2、将标签体内容替换成文本框
            div1.innerHTML = "<input type='text'>";

            //3、div标签中追加一个文本框
            div1.innerHTML += "<input type='text'>";
            div1.innerHTML += "div1";

            //4、修改样式-使用元素的style属性来设置
            div1.onclick = function() {
                div1.style.border = "1px solid red";
                div1.style.width = "200px";

                div1.style.fontSize = "20px";
            }

            //5、修改样式-提前定义好类选择器的样式，通过元素的className属性来设置其class属性值
            var div2 = document.getElementById("div2");
            div2.onclick = function() {
                div2.className = "d1";
            }
        </script>

    </body>
</html>