Cheerio.js:$find承诺被拒绝

问题描述

我试图使用Cheerio从特定的父元素中获取某个HTML类的子元素。这是我的代码

const $ = cheerio.load(validHtmlBody);
var sections = $(".zloOqf").find(".fl").length;
return res.status(400).send(sections);

但是,此代码被拒绝,并出现UnhandledPromiseRejectionWarning错误

(node:60502) UnhandledPromiseRejectionWarning: RangeError [ERR_HTTP_INVALID_STATUS_CODE]: Invalid status code: 1
    at ServerResponse.writeHead (_http_server.js:208:11)
    at ServerResponse.writeHead (index.js:44:26)
    at ServerResponse._implicitHeader (_http_server.js:199:8)
    at ServerResponse.end (_http_outgoing.js:717:10)
    at ServerResponse.send (/node_modules/express/lib/response.js:221:10)
    at index.js:41:30
    at processticksAndRejections (internal/process/next_tick.js:81:5)
(node:60502) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block,or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:60502) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future,promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

将此代码放入try catch块中并返回错误只会返回一个空的json。

解决方法

问题是您将number传递到.send()。这将尝试覆盖状态400,并且由于它不是有效的http状态,因此将抛出所显示的错误。

如果您打算将数字(即节数)发送回客户端,则可以将其作为字符串发送(express会自动将响应内容类型更改为“ text / html”:

return res.status(400).send(sections.toString());

另一种可能性是返回一个指示段数的json:

return res.status(400).json({numberOfSections: sections});

注意:http-status 400可能不是此处的正确代码,因为这表明客户端请求不正确...