Javascript 如何在指定项之后使用getElementById获取标记内部？

如何获取

Text1

span



Text1

span



Text1

span

以下是输出内容：

我尝试使用document.get.Element.ByTagName，但我真的不知道如何将它用于紧跟在红色“span”之后的元素

---

也许，我应该使用jQuery？

如果您要使用类，而不是内嵌CSS，您可以只使用CSS：

.redStyle = {
    color: red;
}

.blueStyle {
    color: blue;
}

// style the elements:

.redStyle + br + a, /* multiple adjacent-sibling combinators are required
                       if you insist on retaining the 'br' elements */
.redStyle ~ a {
    color: green;
}

当然，这需要HTML，例如：

<p>
    Text1<br>
    <span class="blueStyle">span</span><br>
    <a href="http://google.com">Google</a>
</p>
<p>
    Text1<br>
    <span class="redStyle">span</span><br>
    <a href="http://bing.com">Bing</a>
</p>

---

.

警告他分离

tag@david-托马斯：你还没有理解我。我必须使用getElementById（或任何其他方法）获取标记内部文本。对不起，我的问题表述不正确。我已经更新过了。

<p>
    Text1<br>
    <span class="blueStyle">span</span><br>
    <a href="http://google.com">Google</a>
</p>
<p>
    Text1<br>
    <span class="redStyle">span</span><br>
    <a href="http://bing.com">Bing</a>
</p>

function follows(target, cName) {
    while (target.previousSibling) {
        if (target.previousSibling.className && target.previousSibling.className.indexOf(cName) > -1) {
            return true;
        } else {
            target = target.previousSibling;
        }
    }
    return false;
}

var links = document.getElementsByTagName('a'),
    relevantLinks = [],
    relevantText = [];

for (var i = 0, len = links.length; i < len; i++) {
    if (follows(links[i], 'redStyle')) {
        // this adds to the store of relevant links in which you're interested
        relevantLinks.push(links[i]);
        // you could act on them directly, but storing them
        // allows for further use at a later time (if required)
    }
}
for (var i = 0, len = relevantLinks.length; i < len; i++) {
    // iterating over the relevant links/elements, pushing their text
    // into another array to store that text
    relevantText.push(relevantLinks[i]['textContent' || 'innerText']);
}    

console.log(relevantText);

var links = document.getElementsByTagName('a'),
    relevantLinks = document.querySelectorAll('.redStyle ~ a'),
    relevantText = [];

for (var i = 0, len = relevantLinks.length; i < len; i++) {
    relevantText.push(relevantLinks[i]['textContent' || 'innerText']);
}

console.log(relevantText);