在nodejs中使用http请求，我们可以做很多事，比如对接第三方接口，数据采集，测试接口，等等。

var http = require("http");var urlUtil = require('url');var file = require("./file");var querystring = require('querystring');var HttpUtil = {    //get提交url，返回html数据    get : function(url,success,error){        http.get(url,function(res){            var result = "";            res.setEncoding("UTF-8");            res.on("data",function(data){                result += data;            });            res.on('error',error);            res.on('end',function(){                success(result);            });        }).on('error',this.requestError);    },    post : function(hostname,port,path,body,acceptType,contentType,success,error){        var bodyString = "";        if(body!=null && contentType == "application/json"){            bodyString = JSON.stringify(body);        }        else if(body!=null && contentType == "application/x-www-form-urlencoded"){            bodyString = querystring.stringify(body);        }        var opts = {            hostname : hostname,            port : port,            path : path,            method: 'post',            headers : {                'Accept':acceptType,                'Content-Type':contentType,                'Content-Length':bodyString.length            }        }         var req = http.request(opts,function(res){                        var result = "";            res.setEncoding("UTF-8");            res.on("data",function(data){                result += data;            });            res.on('error',error);            res.on('end',function(){                success(result);            });         });        req.on('error',this.requestError);        file.writeInFile(req);        req.write(bodyString);        req.end();    },    //提交表单参数，并返回html内容    postAndReturnHtml : function(url,body,success,error){        var urlConfig = urlUtil.parse(url);        var contentType = "application/x-www-form-urlencoded";        var acceptType = "text/html";        this.post(urlConfig.hostname,urlConfig.port,urlConfig.path,body,acceptType,contentType,success,this.responseError);    },    //get提交url参数，并返回json数据    getAndReturnJson : function(url,success,error){        this.get(url,function(data){            var data = JSON.parse(data);            success(data);        },this.responseError(error));    },    //提交json参数，并返回json    postAndReturnJson : function(url,body,success,error){        var contentType = "application/json";        var acceptType = "application/json";        var urlConfig = urlUtil.parse(url);        this.post(urlConfig.hostname,urlConfig.port,urlConfig.path,body,acceptType,contentType,function(data){            var data = JSON.parse(data);            success(data);        },this.responseError(error));    },    requestError : function(error){        console.log("请求失败--"+error.message);    },    responseError : function(error){        return  error || function(e){            console.log("响应失败--"+e.message);        };    }} module.exports = HttpUtil;