JavaScript 查找元素 查找兄弟元素 previousSibling nextSibling

查找兄弟元素 previousSibling nextSibling

示例

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<!DOCTYPE html>
<html>
    <head>
        <title>访问元素</title>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <style>
            .mycolor{
                color:#fff;
                
            }
            .steam{
                color: red;
            }
        </style>
    </head>
    <body>
        <ul id="ul">
            <li id="ali">油条</li><li id="bli">包子</li><li id="cli">米饺</li><li id="dli"><a id="yufen">鱼粉</a></li>
        </ul>
        <script>
            // 查找父节点
            var tempel = document.getElementById("bli");
            tempel.className="steam";
             
            var previousNode = tempel.previousSibling;
            previousNode.className="mycolor";
 
            var nextNode = tempel.nextSibling;
            nextNode.className="mycolor";
        </script>
    </body>
</html>

兄弟元素查找比较坑，只是能元素在同一行时才能查询。

查询子节点 firstChild lastChild

示例

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<!DOCTYPE html>
<html>
    <head>
        <title>访问元素</title>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <style>
            .mycolor{
                color:#fff;
                
            }
            .steam{
                color: red;
            }
        </style>
    </head>
    <body>
        <ul id="ul"
            ><li id="ali">油条</li
            ><li id="bli">包子</li
            ><li id="cli"><a id="yufen">米饺</a></li
            ><li id="dli">鱼粉</li
        ></ul>
        <script>
            // 查找子节点
            var tempel = document.getElementById("ul");          
            var firstNode = tempel.firstChild;           
            firstNode.className = "mycolor";
            var lastNode = tempel.lastChild;
            lastNode.className = "mycolor";
        </script>
    </body>
</html>

注意，<ul></ul>这段代码，要写成这样才正常查询到。

posted @ 2019-07-11 09:44  乱世以外  阅读(538)  评论(0)    收藏  举报