用 Cheerio 替换 HTML 节点

idl*_*erg 5 javascript dom node.js cheerio

我正在使用Cheerio JS来简化一些古老的 HTML 代码并将其转换为 HTML5。除其他事项外,我正在替换一些如下所示的标记重引号:

要替换的节点:

<div style="margin:20px; margin-top:5px; ">
    <div class="smallfont" style="margin-bottom:2px">Quote:</div>
    <table cellpadding="6" cellspacing="0" border="0" width="100%">
        <tbody>
            <tr>
                <td class="alt2" style="border:1px solid #999">
                    <div>
                        Originally Posted by <strong>Username</strong>
                    </div>
                    <div style="font-style:italic">Lorem ipsum dolor sit amet</div>
                </td>
            </tr>
        </tbody>
    </table>
</div>
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转换后的输出应该是这样的:

<blockquote>Lorem ipsum dolor sit amet</blockquote>
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这是我此时使用的代码当前代码:

$(`table[id^='post']`).each( (i, el) => {
    // Get the post
    let postBody = $(el).find(`div[id^='post_message_']`).html().trim();

    // Replace quotes with blockquotes
    cheerio.load(postBody)('div[style^="margin:20px; margin-top:5px; "]').each( (i, el) => {
        if ($(el).html().trim().startsWith('<div class="smallfont" style="margin-bottom:2px">Quote')) {
            let tbody = $(el).find('tbody > tr > td').html();
            let quote = $(el).find('tbody > tr > td > div');

            if (quote.html() && quote.text().trim().startsWith('Originally Posted by')) {
                let replacement = $('<blockquote>Hello</blockquote>');
                quote.parent().html().replace(quote.html(), replacement);
            }

            // Looks all good
            console.log($(el).html())
        }

        postBody = $(el).html();
    });
});
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最后,一些上下文的更多 HTML:

<div id="post_message_123456">
    As Username has previously written
    <br>
    <div style="margin:20px; margin-top:5px; ">
        <div class="smallfont" style="margin-bottom:2px">Quote:</div>
        <table cellpadding="6" cellspacing="0" border="0" width="100%">
            <tbody>
                <tr>
                    <td class="alt2" style="border:1px solid #999">

                        <div>
                            Originally Posted by <strong>Username</strong>
                        </div>
                        <div style="font-style:italic">Lorem ipsum dolor sit amet</div>
                    </td>
                </tr>
            </tbody>
        </table>
    </div>
    <br>
    I think he has a point!
    <img src="smile-with-sunglasses.gif" />
</div>
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替换本身似乎有效,console.log()语句的输出看起来很好。问题出在最后一行,我试图用替换来替换原始内容。不过,postBody好像以前一样。我究竟做错了什么?

pgu*_*rio 7

试试这样:

let $ = cheerio.load(html)

$('.alt2 div:contains("Originally Posted by")')
  .replaceWith('<blockquote>Lorem ipsum dolor sit amet</blockquote>')

console.log($.html())
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Jas*_*ing 5

根据个人情况替换项目

这演示了如何使用安全 URL 替换不安全的内容,作为一个有用的现实示例,并且还可以做出比使用正则表达式对于大多数普通人来说更容易的编程决策。

const $ = cheerio.load(html)
// example replace all http:// with https://
$('img[src^="http://"]').replaceWith(function() {
  const src = $(this).attr('src')
  if (src.indexOf('s3.amazon.com')) {
    src = src.replace('s3.amazon.com', 'storage.azure')
  }
  return $(this).attr('src', src.replace('http://', 'https://'))
})
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