我收到错误消息，因为 $ 不是函数

Question

var request = require("request"),
cheerio = require("cheerio"),
fs=require("fs"),
urls ,
url = "http://www.w3schools.com/";
request(url, function (error, response, body) {
if (!error && response.statusCode==200) {
 var $ = cheerio.load(body).html();
    var teli = $('a.w3schools-logo').html();
    console.log(teli);
  } 
 });

我收到错误消息

TypeError: $ is not a function
 at Request._callback (C:\Users\AMIT\Desktop\project\demo.js:9:14)   
 at Request.self.callback (C:\Users\AMIT\Desktop\project\node_module   \request\request.js:187:22)
 at emitTwo (events.js:87:13)
 at Request.emit (events.js:172:7)
 at Request.<anonymous> (C:\Users\AMIT\Desktop\project\node_modules\request\request.js:1048:10)
 at emitOne (events.js:77:13)
 at Request.emit (events.js:169:7)
 at IncomingMessage.<anonymous> (C:\Users\AMIT\Desktop\project\node_modules\request\request.js:969:12)
 at emitNone (events.js:72:20)
 at IncomingMessage.emit (events.js:166:7)

请帮忙解决这个错误

Answer 1

根据the cheerio page，正确的加载方式是：

var $ = cheerio.load(body); // <-- note no .html()!

将 .html() returns 正文作为 HTML 字符串调用，这可能不是您想要的。相反，只需将其删除即可获得 jQuery 实例 $.

Answer 2

您需要在正文加载后调用 html() 函数，如下所示

var request = require("request"),
cheerio = require("cheerio"),
fs=require("fs"),
urls ,
url = "http://www.w3schools.com/";
request(url, function (error, response, body) {
    if (!error && response.statusCode==200) {
        var $ = cheerio.load(body);
        var teli = $('a.w3schools-logo').html();
        console.log(teli);
    } 
 });

我收到错误消息，因为 $ 不是函数

I am getting error as $ is not a function

jquery

screen-scraping

node.js

web