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1、搭建nodejs环境。
2、执行npm install nodegrass命令。
3、引入模块，var ng= require(nodegrass);
4、下面先看nodegrass底层的get方法的具体实现，代码如下：
//Get Method Request
//Support HTTP and HTTPS request,and Automatic recognition
//@Param url
//@Param callback
NodeGrass.prototype.get = function(url,callback, reqheaders, charset){
var protocol = getProtocol(url);
var _defaultCharSet = ‘utf8‘;
if(typeof charset === ‘string‘ ){
_defaultCharSet = charset;
}
if(typeof(reqheaders) === "string" && charset === undefined) {
_defaultCharSet = reqheaders;
}
var newheader = {};
if(reqheaders !== undefined && typeof(reqheaders) === "object") {
for(var ele in reqheaders) {
newheader[ele.toLowerCase()] = reqheaders[ele];
}
}
newheader["content-length"] = 0;
var options = {
host:getHost(url),
port:getPort(url),
path:getPath(url),
method:‘GET‘,
headers:newheader
};
if(protocol === http || protocol === https){
return _sendReq(protocol,null,options,_defaultCharSet,callback);
}else{
throw "sorry,this protocol do not support now";
}
}
从中可以看出，只需要在方法调用中，加入如下参数即可：
url请求地址,
callback回调函数,
reqheaders请求头标识,一般使用 ‘Content-Type‘: ‘application/x-www-form-urlencoded‘
charset编码方式，一般为utf8
对应的post请求的底层实现代码如下：
//Post Method Request
//Support HTTP and HTTPS request,and Automatic recognition
//@Param url
//@Param callback
//@Param header
//@param postdata
NodeGrass.prototype.post = function(url,callback,reqheaders,data,charset){
var protocol = getProtocol(url);
var _defaultCharSet = ‘utf8‘;
if(typeof charset === ‘string‘ ){
_defaultCharSet = charset;
}
if(typeof(data) === ‘object‘){data = querystring.stringify(data);}
var options={
host:getHost(url),
port:getPort(url),
path:getPath(url),
method:‘POST‘,
headers:reqheaders
};
if(protocol === http || protocol === https){
return _sendReq(protocol,data,options,_defaultCharSet,callback)
}else{
throw "sorry,this protocol do not support now";
}
}
从中可以看出，只需要在方法调用中，加入如下参数即可：
url请求地址,
callback回调函数,
reqheaders请求头标识,一般使用 ‘Content-Type‘: ‘application/x-www-form-urlencoded‘
data请求所包含的具体数据,
charset编码方式，一般为utf8
封装代码如下：
var nodegrass = require(‘nodegrass‘);
var REQ_HEADERS = {
‘Content-Type‘ : ‘application/x-www-form-urlencoded‘
};
// get请求
exports.ngGet = function(url, params, encoding) {
if (!encoding) {
encoding = "UTF-8";
}
var result = "";
nodegrass.get(url, function(data, status, headers) {
console.log(status);
console.log(headers);
console.log(data);
result = data;
}, REQ_HEADERS, params, encoding).on(‘error‘, function(e) {
console.log("Got error: " + e.message);
});
return result;
};
// post请求
exports.ngPost = function(url, params, encoding) {
if (!encoding) {
encoding = "UTF-8";
}
var result = "";
nodegrass.post(url, function(data, status, headers) {
console.log(status);
console.log(headers);
console.log(data);
result = data;
}, REQ_HEADERS, params, encoding).on(‘error‘, function(e) {
console.log("Got error: " + e.message);
});
return result;
}
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原文地址：http://www.cnblogs.com/wuxiang/p/4763726.html
