1.不属于函数的优点的是( )。(单选题)
A.最大化代码重用
B. 最小化代码冗余
C.复杂过程的分解
D.简单问题复杂化
这个问题，你不会编程也应该会
优点是什么？“简单问题复杂化”只有这个一看就是缺点啊
记得考驾照，科目一，就有大量的这种题目，根本不用看书，你看着题目就知道答案。
d
不知道你这个问题是否已经解决, 如果还没有解决的话:/*在这里插入代码片*/var source_name = "中国新闻网";
var domain = 'http://www.chinanews.com/';
var myEncoding = "utf-8";
var seedURL = 'http://www.chinanews.com/';
var seedURL_format = "$('a')";
var keywords_format = " $('meta[name=\"keywords\"]').eq(0).attr(\"content\")";
var title_format = "$('title').text()";
var date_format = "$('#pubtime_baidu').text()";
var author_format = "$('#editor_baidu').text()";
var content_format = "$('.left_zw').text()";
var desc_format = " $('meta[name=\"description\"]').eq(0).attr(\"content\")";
var source_format = "$('#source_baidu').text()";
var url_reg = /\/(\d{4})\/(\d{2})-(\d{2})\/(\d{7}).shtml/;
var regExp = /((\d{4}|\d{2})(\-|\/|\.)\d{1,2}\3\d{1,2})|(\d{4}年\d{1,2}月\d{1,2}日)/
var fs = require('fs');
var myRequest = require('request')
var myCheerio = require('cheerio')
var myIconv = require('iconv-lite')
require('date-utils');
//防止网站屏蔽我们的爬虫
var headers = {
'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.65 Safari/537.36'
}
//request模块异步fetch url
function request(url, callback) {
var options = {
url: url,
encoding: null,
//proxy: 'http://x.x.x.x:8080',
headers: headers,
timeout: 10000
}
myRequest(options, callback)
}
request(seedURL, function(err, res, body) {
var html = myIconv.decode(body, myEncoding);
var $ = myCheerio.load(html, { decodeEntities: true });
var seedurl_news;
try {
seedurl_news = eval(seedURL_format);
//console.log(seedurl_news);
} catch (e) { console.log('url列表所处的html块识别出错：' + e) };
seedurl_news.each(function(i, e) {
var myURL = "";
try {
var href = "";
href = $(e).attr("href");
if (href.toLowerCase().indexOf('http://') >= 0) myURL = href;
else if (href.startsWith('//')) myURL = 'http:' + href;
else myURL = seedURL.substr(0, seedURL.lastIndexOf('/') + 1) + href;
} catch (e) { console.log('识别种子页面中的新闻链接出错：' + e) }
if (!url_reg.test(myURL)) return;
//console.log(myURL);
newsGet(myURL);
});
});
function newsGet(myURL) {
request(myURL, function(err, res, body) {
var html_news = myIconv.decode(body, myEncoding);
var $ = myCheerio.load(html_news, { decodeEntities: true });
myhtml = html_news;
console.log("转码读取成功:" + myURL);
var fetch = {};
fetch.title = "";
fetch.content = "";
fetch.publish_date = (new Date()).toFormat("YYYY-MM-DD");
fetch.url = myURL;
fetch.source_name = source_name;
fetch.source_encoding = myEncoding;
fetch.crawltime = new Date();
if (keywords_format == "") fetch.keywords = source_name; // eval(keywords_format); //没有关键词就用sourcename
else fetch.keywords = eval(keywords_format);
if (title_format == "") fetch.title = ""
else fetch.title = eval(title_format);
if (date_format != "") fetch.publish_date = eval(date_format);
console.log('date: ' + fetch.publish_date);
fetch.publish_date = regExp.exec(fetch.publish_date)[0];
fetch.publish_date = fetch.publish_date.replace('年', '-')
fetch.publish_date = fetch.publish_date.replace('月', '-')
fetch.publish_date = fetch.publish_date.replace('日', '')
fetch.publish_date = new Date(fetch.publish_date).toFormat("YYYY-MM-DD");
if (author_format == "") fetch.author = source_name;
else fetch.author = eval(author_format);
if (content_format == "") fetch.content = "";
else fetch.content = eval(content_format).replace("\r\n" + fetch.author, "");
if (source_format == "") fetch.source = fetch.source_name;
else fetch.source = eval(source_format).replace("\r\n", "");
if (desc_format == "") fetch.desc = fetch.title;
else fetch.desc = eval(desc_format).replace("\r\n", "");
var filename = source_name + "_" + (new Date()).toFormat("YYYY-MM-DD") +
"_" + myURL.substr(myURL.lastIndexOf('/') + 1) + ".json";
fs.writeFileSync(filename, JSON.stringify(fetch));
});
}答案：
D. 简单问题复杂化。
函数的定义是一段可重用的代码，它接受输入并生成输出。 函数可以最大化代码的重用，最小化代码冗余，并将复杂问题分解为更容易管理的小问题。然而，简单问题本来就是简单的，通过将其改变为不必要地复杂化，函数并不会变得更好。因此D选项不是函数的优点。