HTML DOM-->获取文本节点

1.元素节点.innerHTML

　　从对象的开始标签到结束标签的全部内容，不包括本身html标签

　　举例：获取button标签之间的内容

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <title>js_excise</title>
        <script src="./js/js_excise.js" type="text/javascript" charset="utf-8"></script>
    </head>
    <body style="height: 187.5rem;">
        <button id="in" onclick="func()">更新</button>
        <input  type="text" name="Text" placeholder="please your name" my='abner'>
        <script type="text/javascript">
            var js = document.getElementById('in')
            console.log(js.innerHTML)
        </script>
    </body>
</html>

　　输出：

2.元素节点.outerHTML

　　除了包含innerHTML的全部内容以外，还包含对象标签本身

　　举例：

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <title>js_excise</title>
        <script src="./js/js_excise.js" type="text/javascript" charset="utf-8"></script>
    </head>
    <body style="height: 187.5rem;">
        <button id="in" onclick="func()">更新</button>
        <input  type="text" name="Text" placeholder="please your name" my='abner'>
        <script type="text/javascript">
            var js = document.getElementById('in')
            console.log(js.outerHTML)
        </script>
    </body>
</html>

　　输出：

3.元素节点.innerText

　　从对象的开始标签到结束标签的全部文本内容

　　举例：

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <title>js_excise</title>
        <script src="./js/js_excise.js" type="text/javascript" charset="utf-8"></script>
    </head>
    <body style="height: 187.5rem;">
        <button id="in" onclick="func()">更新</button>
        <input  type="text" name="Text" placeholder="please your name" my='abner'>
        <script type="text/javascript">
            var js = document.getElementById('in')
            console.log(js.innerText)
        </script>
    </body>
</html>

　　输出：

4.修改

　　文本节点重新赋值

　　　　元素节点.innerHTML = '新值'

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <title>js_excise</title>
        <script src="./js/js_excise.js" type="text/javascript" charset="utf-8"></script>
    </head>
    <body style="height: 187.5rem;">
        <button id="in" onclick="func()">更新</button>
        <input  type="text" name="Text" placeholder="please your name" my='abner'>
        <script type="text/javascript">
            var js = document.getElementById('in')
            js.innerHTML='<H1>我是H标签</H1>'
            console.log(js)
        </script>
    </body>
</html>

　　输出：

HTML DOM-->获取文本节点

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