3.nodejs(三) 常用API

1.querystring

querystring: --- > qs npm i qs ==> qs:parse/stringify第三方插件,只有一个参数

JSON.parse 字符串转对象
JSON.stringify 对象转字符串

qs.parse() --- decode
qs.stringify() --- encode

parse/stringify(str/json,第一次切割符号,第二次切割符号)

qs.escape() 编码 encodeURIComponent
qs.unescape() 解码 decodeURIComponent

qs.decode 对象转字符串
qs.encode 字符串转对象

1.qs.parse(); qs.stringify();

qs.js

var qs = require("querystring");

var str = "a=12&b=5"
//{a:12,b:5}
var json = qs.parse(str);

console.log(json);

console.log(qs.stringify(json));

res:

my@my-THINK MINGW64 /d/workspace/7.11
$ node qs
{ a: '12', b: '5' }
a=12&b=5

qs3.js

//qs.parse/stringify(str,第一次切割的符号,第二次切割的符号)

var qs = require("querystring");

var str = "a|12=b|5=age|20";

//qs.parse/stringify(str,第一次切割的符号,第二次切割的符号)

var json = qs.parse(str,"=","|");

console.log(json);

console.log(qs.stringify(json,"=","|"));

res

my@my-THINK MINGW64 /d/workspace/7.11
$ node qs3
{ a: '12', b: '5', age: '20' }
a|12=b|5=age|20

qs4.js

引入第三方模块 npm i qs

//qs.parse/stringify(str)
后面不能跟分隔符号

var qs = require("qs");

var str = "a=12&b=5";

var json = qs.parse(str);

console.log(json);

console.log((qs.stringify(json)));

res:

my@my-THINK MINGW64 /d/workspace/7.11
$ node qs4
{ a: '12', b: '5' }
a=12&b=5

2.qs.escape();编码 qs.unescape();解码

qs2.js

var qs = require("querystring");

var str = "aaa中文";
var code = encodeURIComponent(str);
console.log(code);

console.log(decodeURIComponent(code));
console.log("----------------------");
var code = qs.escape(str);
console.log(code);
console.log(qs.unescape(code));

res:

my@my-THINK MINGW64 /d/workspace/7.11
$ node qs2
aaa%E4%B8%AD%E6%96%87
aaa中文
----------------------
aaa%E4%B8%AD%E6%96%87
aaa中文

3. qs.encode()//转字符串

qs.decode()//转对象 parse

qs5.js

var qs = require("querystring");
//encode|decode

//var str = "aaa中文";
var str = "a=12&b=5";
var str = {a:12,b:5};

var code = qs.encode(str);//转字符串  stringify

console.log(code);

console.log(qs.decode(code));//转对象 parse

res:

my@my-THINK MINGW64 /d/workspace/7.11
$ node qs5
a=12&b=5
{ a: '12', b: '5' }

2.url

url：
url.parse()--->urlObj
url.format(urlObj)--> strUrl
url.resolve(from, to);

URLSearchParams new URLSearchParams();

地址组成：

http://www.baidu.com:80/index.html?user=aaa&pass=123#page6


http://   www.baidu.com  :80     /index.html      ?user=aaa&pass=123      #page6
 
协议      域名           端口      路径(资源地址)   数据              锚点 哈希hash

location


Url {
  protocol: 'http:',
  slashes: true,
  auth: null,
  host: 'www.baidu.com:80',
  port: '80',
  hostname: 'www.baidu.com',
  hash: '#page6',
  search: '?user=aaa&pass=123',
  query: 'user=aaa&pass=123',
  pathname: '/index.html',
  path: '/index.html?user=aaa&pass=123',
  href: 'http://www.baidu.com:80/index.html?user=aaa&pass=123#p
age6' }



 URL {
  href: 'http://www.baidu.com/index.html?user=aaa&pass=123#page6',
  origin: 'http://www.baidu.com',
  protocol: 'http:',
  username: '',
  password: '',
  host: 'www.baidu.com',
  hostname: 'www.baidu.com',
  port: '',
  pathname: '/index.html',
  search: '?user=aaa&pass=123',
  searchParams: URLSearchParams { 'user' => 'aaa', 'pass' => '123'
},
  hash: '#page6' }

1. .parse()转成对象

.format()转成字符串

url1.js

var modUrl = require("url");

var url = "http://www.baidu.com:80/index.html?user=aaa&pass=123#page6";

var urlObj = modUrl.parse(url);

console.log(1,urlObj);
console.log(2,modUrl.format(urlObj));

res:

my@my-THINK MINGW64 /d/workspace/7.11
$ node url1
1 Url {
  protocol: 'http:',
  slashes: true,
  auth: null,
  host: 'www.baidu.com:80',
  port: '80',
  hostname: 'www.baidu.com',
  hash: '#page6',
  search: '?user=aaa&pass=123',
  query: 'user=aaa&pass=123',
  pathname: '/index.html',
  path: '/index.html?user=aaa&pass=123',
  href: 'http://www.baidu.com:80/index.html?user=aaa&pass=123#page6' }
2 'http://www.baidu.com:80/index.html?user=aaa&pass=123#page6'

url2.js

var modUrl = require("url");

var url = "http://www.baidu.com:9000/index.html?user=aaa&pass=123#page6";

console.log(1,new modUrl.Url(url));
console.log(2,new modUrl.URL(url));

res:

my@my-THINK MINGW64 /d/workspace/7.11
$ node url2
1 Url {
  protocol: null,
  slashes: null,
  auth: null,
  host: null,
  port: null,
  hostname: null,
  hash: null,
  search: null,
  query: null,
  pathname: null,
  path: null,
  href: null }
2 URL {
  href: 'http://www.baidu.com:9000/index.html?user=aaa&pass=123#page6',
  origin: 'http://www.baidu.com:9000',
  protocol: 'http:',
  username: '',
  password: '',
  host: 'www.baidu.com:9000',
  hostname: 'www.baidu.com',
  port: '9000',
  pathname: '/index.html',
  search: '?user=aaa&pass=123',
  searchParams: URLSearchParams { 'user' => 'aaa', 'pass' => '123' },
  hash: '#page6' }

url3.js

.resolve(),替换路径

var modUrl = require("url");

console.log(modUrl.resolve('http://localhost:9000/login', 'index'));  
console.log(modUrl.resolve('http://localhost:9000/login', '/index')); 

console.log(modUrl.resolve('http://localhost:9000/users/login', 'index')); 
//不加/只替换最后一个相对路径

console.log(modUrl.resolve('http://localhost:9000/users/login', '/index'));  
//加/替换绝对路径

res:

my@my-THINK MINGW64 /d/workspace/7.11
$ node url3
http://localhost:9000/index
http://localhost:9000/index
http://localhost:9000/users/index
http://localhost:9000/index

url4.js

URLSearchParams
new URLSearchParams();

var modUrl = require("url");

var params = new modUrl.URLSearchParams();
console.log(params);

params.append("user","aaa");
params.append("pass","123");
//append添加数据
// user=aaa&pass=123
console.log(params);
console.log(params.toString());

res:

my@my-THINK MINGW64 /d/workspace/7.11
$ node url4
URLSearchParams {}
URLSearchParams { 'user' => 'aaa', 'pass' => '123' }
user=aaa&pass=123

url5.js

//node 10以上,才可以
var params = new URLSearchParams();

params.append("user","aaa");
params.append("pass","123");

// user=aaa&pass=123

console.log(params.toString());

res:

my@my-THINK MINGW64 /d/workspace/7.11
$ node url5

user=aaa&pass=123

3.path

path:

path.parse(path)
path.format(pathObject)

path.basename(path)
path.dirname(path) 路径
path.extname(path)

path.join() 相对路径路径拼接
path.relative() 获取的相对路径路线图
path.resolve() 绝对路径路径拼接碰到绝对路径会替换

__dirname 绝对路径
__filename 绝对地址包含文件名

global 全集对象相当于 window

path1.js

var path = require("path");

//win:   linux /
var str = "D:\wamp64\www\20180711\path.js"; //window要用双斜线,向右撇
var str = "D:/wamp64/www/20180711/path.js";

var pathObj = path.parse(str);

console.log(pathObj);//字符串转对象

console.log(path.format(pathObj));//对象转字符串

res:

my@my-THINK MINGW64 /d/workspace/7.11
$ node path1
{ root: 'D:/',
  dir: 'D:/wamp64/www/20180711',
  base: 'path.js',
  ext: '.js',
  name: 'path' }
D:/wamp64/www/20180711path.js

path2.js

var path = require("path");

var str = "D:/wamp64/www/20180711/path.js";

console.log(path.parse(str));
console.log("--------------------------");
console.log(path.basename(str));//文件名
console.log(path.dirname(str)); //路径
console.log(path.extname(str));//文件后缀 带点

console.log("--------------------------");

console.log(__dirname);
console.log(__filename);

res:

my@my-THINK MINGW64 /d/workspace/7.11
$ node path2
{ root: 'D:/',
  dir: 'D:/wamp64/www/20180711',
  base: 'path.js',
  ext: '.js',
  name: 'path' }
--------------------------
path.js
D:/wamp64/www/20180711
.js
--------------------------
D:workspace7.11
D:workspace7.11path2.js

path31.js

var path = require("path");

console.log("www"+"/index.html");//只是拼接

console.log(path.join("www","/index.html"));
console.log(path.join("www","/////index.html"));//自动去除多余的/
console.log(path.join("www","index.html"));//自动添加/

res:

my@my-THINK MINGW64 /d/workspace/7.11
$ node path31
www/index.html
wwwindex.html
wwwindex.html
wwwindex.html

path32.js

var path = require("path");

console.log("www"+"/index.html");

console.log(path.join("\a","b","c"));
console.log(path.join("/a","b","c"));

console.log(path.join("a","/b","../c")); //../返回上级目录

res:

my@my-THINK MINGW64 /d/workspace/7.11
$ node path32
www/index.html
ac
ac
ac

path33.js

var path = require("path");

console.log(path.relative('/data/orandea/test/aaa', '/data/orandea/impl/bbb'));

console.log(path.relative('C:\orandea\test\aaa', 'C:\orandea\impl\bbb'));

res:

my@my-THINK MINGW64 /d/workspace/7.11
$ node path33
....implbb
....implbb

path34.js

var path = require("path");

/*  resolve返回绝对路径,参数前不加/,
在后面添加,加/直接替换全部  */

console.log(path.resolve("a","b","c"));
console.log(path.resolve("a","/b","/c"));
console.log(path.resolve("a/b/c","../d","../e"));

res:

my@my-THINK MINGW64 /d/workspace/7.11
$ node path34
D:workspace7.11ac
D:c
D:workspace7.11ae

4.Buffer

Buffer 二进制流
操作方式和字符串类似

16进制 0-F

"a".chatCodeAt(0).toString(16); ascii:97 hex:61

97: a (ASCII)

String.fromCharCode(code);//ASCII转字符

中文的范围 4e00 - 9fa5
u4e00(直接转成中文)
0X4e00(转成十进制)

hex: 16进制

Buffer.from(...); new Buffer(废弃)

buf1.js

var str = "abc";

//var buf = new Buffer(str);
var buf = Buffer.from(str);

console.log(buf);

//16进制 中文的范围 4e00 - 9fa5
console.log("a".charCodeAt(0).toString(16));

res:

$ node buf1
<Buffer 61 62 63>
61

buf2.js

const buf = Buffer.from('abc', 'ascii');

console.log(buf);
console.log(buf.toString('hex'));
console.log(buf.toString('base64'));

res:

$ node buf2
<Buffer 61 62 63>
616263
YWJj

buf3.js

const buf = Buffer.from([1, 2, 3]);

console.log(buf);

for(var i = 0; i < buf.length; i++){
	console.log(buf[i]);	
}
// Prints:
//   1
//   2
//   3
for (const b of buf) {
  console.log(b);
}

res:

$ node buf3
<Buffer 01 02 03>
1
2
3
1
2
3

buf4.js

var buf = Buffer.from([0x61, 0x62, 0x63]);
console.log(buf.toString());
var buf = Buffer.from("abc");
console.log(buf.toString());

res:

$ node buf4
abc
abc

buf42.js

var buf1 = Buffer.from("abc"); 

//var buf2 = Buffer.from(buf1);

var buf2 = Buffer.from("abc");

console.log(buf1.toString(),buf2.toString());//abc abc

console.log(buf1 == buf2);//false

console.log(buf1 === buf2);//false

console.log(buf1.toString() == buf2.toString());//true

console.log(Buffer.compare(buf1, buf2));//0 , 相同为0,不同为-1

res:

$ node buf42
abc abc
false
false
true
0

buf5.js

var str = "abc中文";
var buf = Buffer.from(str); 

console.log(buf);

console.log(str.length);
console.log(buf.length);
console.log(Buffer.byteLength(buf));

res:

$ node buf5
<Buffer 61 62 63 e4 b8 ad e6 96 87>
5
9
9

buf6.js

var str = "abc";

var arr = [];
for(var i = 0; i < str.length; i++){
	arr.push(Buffer.from(str[i]));//61 62 62 arr[buf1,buf2,buf3]
}
console.log(arr);
console.log(Buffer.concat(arr));

res:

$ node buf6
[ <Buffer 61>, <Buffer 62>, <Buffer 63> ]
<Buffer 61 62 63>

buf7.js

Buffer.isBuffer() 判断是否是Buffer

var str = "abc";
console.log(Buffer.isBuffer(str));

var buf = Buffer.from(str);
console.log(Buffer.isBuffer(buf));

res:

$ node buf7
false
true

buf8.js

.equals()判断buffer是否相等

const buf1 = Buffer.from('ABC');
const buf2 = Buffer.from('414243', 'hex');//ABC
const buf3 = Buffer.from('ABCD');

// 输出: true
console.log(buf1.equals(buf2));

// 输出: false
console.log(buf1.equals(buf3));

res:

$ node buf8
true
false

buf9.js

/*
buf.includes/indexOf
*/
var buf = Buffer.from('abcdef');

console.log(buf.includes("def"));//是否包含"def"

console.log(buf.indexOf("def"));
//是否包含"def",有的话输出开始下标,没有的话输出-1;

res:

$ node buf9
true
3

buf10.js

/*
buf.includes/indexOf
*/
var buf = Buffer.from('abcdef');

console.log(buf.keys());
console.log(buf.values());
//buf是一个对象,需循环输出key和value

console.log("------keys------------");
for(var n of buf.keys()){
	console.log(n);
}
console.log("------values------------");
for(var n of buf.values()){
	console.log(n,String.fromCharCode(n));
}

res:

$ node buf10
{}
{}
------keys------------
0
1
2
3
4
5
------values------------
97 'a'
98 'b'
99 'c'
100 'd'
101 'e'
102 'f'

5.events

evt1.js

var EventEmitter = require("events");

console.log(EventEmitter == EventEmitter.EventEmitter);

res:

$ node evt1
true

evt21.js

var EventEmitter = require("events");

var ev = new EventEmitter();

console.log(ev.on == ev.addListener);

//添加事件

//addListener/on
ev.on("sum",function(a,b){
	console.log("sum:",a+b);	
});
ev.addListener("abc",function(){
	console.log("abc:");	
});

//触发

console.log(1,ev.emit("sum",12,5));
console.log(2,ev.emit("abc"));

res:

$ node evt21
true
sum: 17
1 true
abc:
2 true

evt22.js

var EventEmitter = require("events");

var ev = new EventEmitter.EventEmitter();

console.log(ev.on == ev.addListener);

//添加事件

//addListener/on
ev.on("sum",function(a,b){
	console.log("sum:",a+b);	
});
ev.addListener("abc",function(){
	console.log("abc:");	
});

//触发

console.log(1,ev.emit("sum",12,5));
console.log(2,ev.emit("abc"));

res:

$ node evt22
true
sum: 17
1 true
abc:
2 true

evt3.js

var EventEmitter = require("events");

var ev = new EventEmitter();

console.log(1,ev.on == ev.addListener);

//添加事件

ev.prependListener("abc",function(){
	console.log(2,"abc:");	
});

//触发
console.log(3,ev.emit("abc"));

res:

$ node evt3
1 true
2 'abc:'
3 true

6.fs 文件目录

文件

读写

fs.readFile 读
fs.writeFile 写
fs.appendFile 添加内容
fs.unlink 删除
fs.copyFile 复制

状态

文件或者目录是否存在

fs.exists 废弃
fs.access

判断是否是文件或者目录

fs.stat(path,function(stats){
		stats.isFile()/isDirectory()
})

监听

fs.watch(filename[, options][, listener])
fs.watchFile(filename[, options], listener)

fs1.js

写比读先执行

var fs = require("fs");
//readFile/Sync

//读
fs.readFile("a.txt",function(err,data){
	console.log(1,err,data);	
});
//写,找到a.txt没有的话创建,添加"aaa"到a.txt

fs.writeFile("a.txt","bbb",function(err){
	console.log(2,err);	//返回null,表示没有错误
});

res:

$ node fs1
2 null
1 null <Buffer 62 62 62>

fs2.js

//copyFile("源文件","目标文件",回调函数)

var fs = require("fs");

//拷贝 1、先读 2、再写

//读
/*fs.readFile("a.txt",function(err,data){
	if(err){
		console.log("读取文件失败");
	} else {
		//写
		fs.writeFile("b.txt",data,function(err){
			if(err){
				console.log("拷贝失败");
			} else {
				console.log("拷贝成功");
			}	
		});	
	}
	
});
*/
//copyFile("源文件","目标文件",回调函数)
fs.copyFile("a.txt","b.txt",function(err){
	if(err){
		console.log("拷贝失败");
	} else {
		console.log("拷贝成功");
	}	
});

rse:

$ node fs2
拷贝成功

fs3.js

//appendFile 创建文件或者追加

var fs = require("fs");
//appendFile 创建文件或者追加
fs.appendFile("b.txt","append",function(err){
	console.log(err);
});

res:

$ node fs3
null

fs4.js

unlink 删除文件不能删除目录

var fs = require("fs");

//unlink 删除文件 不能删除目录
fs.unlink("b.txt",function(err){
	console.log(err);
});

res:

$ node fs4
null

fs51.js

//fs.mkdir()创建目录

var fs = require("fs");

//创建目录
fs.mkdir("abc", function(err){
	console.log(err);	
});

res:

$ node fs51
null

fs52.js

//删除目录fs.rmdir

var fs = require("fs");

//删除目录
fs.rmdir("abc", function(err){
	console.log(err);	
});

res:

$ node fs52
null

fs53.js

//读取目录fs.readdir

var fs = require("fs");

//读取目录
fs.readdir("abc", function(err,res){
	console.log(err,res);	
});

res:

$ node fs53
null [ 'youarebeautiful' ]

fs61.js

fs.exists
//判断文件和目录
//文件状态文件、目录是否存在是文件还是目录

var fs = require("fs");

//判断文件和目录
//文件状态 文件、目录是否存在 是文件 还是目录
fs.exists("abcd", (exists) => {
  	console.log(exists);
});

res:

$ node fs61
true

fs62.js

fs.access

var fs = require("fs");

//判断文件和目录
//文件状态 文件、目录是否存在 是文件 还是目录
fs.access("a.txt", (err) => {
  	console.log(err);
});

res:

$ node fs62
null

fs63.js

var fs = require("fs");

//判断文件和目录
//文件状态 文件、目录是否存在 是文件 还是目录
fs.stat("abc", (err,stats) => {
	//stats.isDirectory()是否是目录/stats.isFile()是否是文件
  	console.log(err,stats.isFile(),stats.isDirectory());
});

res:

$ node fs63
null false true

fs71.js

var fs = require("fs");

//可以监听文件和目录
//监听有范围限制 只有一层
fs.watch("a.txt", (eventType, filename) => {
  console.log(`事件类型是: ${eventType}-----${filename}`);
});

res:

$ node fs71
事件类型是: change-----a.txt
事件类型是: change-----a.txt

fs72.js

var fs = require("fs");

//可以监听文件 目录 有延迟  目录的文件的修改监听不到 最好用来监听文件
fs.watchFile("abc", (curr, prev) => {
  /*console.log(curr);
  console.log(prev);*/
  console.log(curr.mtime);
});


/*Stats {
  dev: 4145068239,
  mode: 16822,
  nlink: 1,
  uid: 0,
  gid: 0,
  rdev: 0,
  blksize: undefined,
  ino: 844424930155958,
  size: 0,
  blocks: undefined,
  atimeMs: 1531312004235.5886,
  mtimeMs: 1531312004235.5886,
  ctimeMs: 1531312004235.5886,
  birthtimeMs: 1531311081220.7952,
  atime: 2018-07-11T12:26:44.236Z,
  mtime: 2018-07-11T12:26:44.236Z,
  ctime: 2018-07-11T12:26:44.236Z,
  birthtime: 2018-07-11T12:11:21.221Z } */

res:

$ node fs72
2018-07-11T12:24:44.050Z

7.流stream

流stream

输入流、输出流

var rs = fs.createReadStream("src");
var ws = fs.createWriteStream("dist");

管道pipe

rs.pipe(ws);

拆解：

//一边读一边写

rs.on("data",function(data){
	ws.wrtie(data);
});
rs.on("end",function(data){
	ws.end(fn);
});

rs.on("error",function(){...})
ws.on("error",function(){...})

gzip:

1、const zlib = require('zlib');

2、必须设置一个头：

res.writeHead(200, { 'content-encoding': 'gzip' });

3、通过管道

rs.pipe(zlib.createGzip()).pipe(res);

stream1.js

var fs = require("fs");
//输入流 输出
var rs = fs.createReadStream("a.txt");
var ws = fs.createWriteStream("b.txt");
//管道 pipe
rs.pipe(ws);将a.txt中的内容一步一步写入b.txt

res:

$ node stream1

stream2.js

var fs = require("fs");

//输入流
var rs = fs.createReadStream("a.txt");
rs.on("data",function(data){
	console.log(data);	
});
rs.on("end",function(){
	console.log("读完了");	
});
rs.on("error",function(){
	console.log("读取文件失败");	
});

res:

$ node stream2
<Buffer 61 61 61>
读完了

stream3.js

var fs = require("fs");
var ws = fs.createWriteStream("b.txt");

ws.write("abc",function(){
	console.log("write完了");	
});
ws.end("end",function(){
	console.log("end写完了");	
});

res:

$ node stream3
write完了
end写完了

stream4.js

var fs = require("fs");
var rs = fs.createReadStream("a.txt");
var ws = fs.createWriteStream("b.txt");

rs.on("data",function(data){
	ws.write(data);	
});
rs.on("end",function(){
	console.log("读完了");	
	ws.end(function(){
		console.log("写完了");	
	});
});

res:

$ node stream4
读完了
写完了

server.js

前面的服务器可以写成流
大文件可以压缩

var http = require("http");
var fs = require("fs");
var zlib = require("zlib");

var server = http.createServer(function(req,res){
	
	var url = req.url;
	if(url == "/favicon.ico") return;
	/*fs.readFile("www"+url,function(err,data){
		if(err){
			res.end("404");
		} else {
			res.end(data);
		}	
	});*/
	
	res.writeHead(200, { 'content-encoding': 'gzip' });
	
	var rs = fs.createReadStream("www"+url);
	
	rs.pipe(zlib.createGzip()).pipe(res);
	
});

server.listen(9000);

完整服务器代码:

server.js

var http = require("http");
var fs = require("fs");
var zlib = require("zlib");
var modUrl = require("url");
var qs = require("querystring");
var users = {aaa:123};
var server = http.createServer(function(req,res){
	
	var url = req.url;
	var str = "";
	req.on("data",function(data){
		str += data;
	})
	
	req.on("end",function(){
		var urlObj = modUrl.parse(url,true);
		url = urlObj.pathname;
		var GET = urlObj.query;
		
		var POST = qs.parse(str);
		var params = req.method == "POST" ? POST : GET;
		var username = params.user;
		var password = params.pass;
		if(url == "/login"){
			if(users[username]){
				if(users[username] == password){
					res.end(JSON.stringify({"error":1,"msg":"登陆成功"}));
				}else{
					res.end(JSON.stringify({"error":0,"msg":"用户名或者密码错误"}));
				}
			}else{
				res.end(JSON.stringify({"error":0,"msg":"用户名或者密码错误"}));
			}
		}else if(url == "/reg"){
			if(users[username]){
				res.end(JSON.stringify({"error":0,"msg":"用户名已存在"}));
			}else{
				users[username] = password;
				res.end(JSON.stringify({"error":1,"msg":"注册成功"}));
			}
		}else if(url == "/favicon.ico") {
			return;
		}else{
			
			res.writeHead(200, { 'content-encoding': 'gzip' });
	
			var rs = fs.createReadStream("www"+url);
			
			rs.pipe(zlib.createGzip()).pipe(res);
			console.log(res);
			
		}
	})	
	
});

server.listen("9000",function(){
	console.log("服务器已打开!");
})

user.html

<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<script src="jquery.js"></script>
		<script>
			$(function(){
				$oUser = $("#user");
				$oPass = $("#pass");
				$oLogin = $("#login");
				$oReg = $("#reg");
				$oLogin.click(function(){
					$.ajax({
						type:"get",
						url:"/login",
						data:{
							user:$oUser.val(),
							pass:$oPass.val()
						},
						async:true,
						success:function(str){
							alert(str);
						}
					});
				});
				$oReg.click(function(){
					$.ajax({
						type:"post",
						url:"/reg",
						data:{
							user:$oUser.val(),
							pass:$oPass.val()
						},
						async:true,
						success:function(str){
							alert(str);
						}
					});
				});
			})
		</script>
	</head>
	<body>
		用户名:<input id = "user" type="text" value="aaa"/><br />
		密码: <input id ="pass" type="text" value="123"/><br />
		<input id = "login" type="button" value="登录"/>
		<input id = "reg" type="button" value="注册"/>
		
	</body>
</html>

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原文地址：https://www.cnblogs.com/zhongchao666/p/9296671.html

3.nodejs(三) 常用API

1.querystring

1.qs.parse(); qs.stringify();

qs.js

qs3.js

qs4.js

2.qs.escape();编码 qs.unescape();解码

qs2.js

3.

qs.encode()//转字符串

qs.decode()//转对象 parse

qs5.js

2.url

1.

.parse()转成对象

.format()转成字符串

url1.js

url2.js

url3.js

url4.js

url5.js

3.path

path:

path1.js

path2.js

path31.js

path32.js

path33.js

path34.js

4.Buffer

buf1.js

buf2.js

buf3.js

buf4.js

buf42.js

buf5.js

buf6.js

buf7.js

buf8.js

buf9.js

buf10.js

5.events

evt1.js

evt21.js

evt22.js

evt3.js

6.fs 文件目录

文件

目录

状态

监听

fs1.js

fs2.js

fs3.js

fs4.js

fs51.js

fs52.js

fs53.js

fs61.js

fs62.js

fs63.js

fs71.js

fs72.js

7.流stream

输入流、输出流

管道pipe

拆解：

rs.on("error",function(){...}) ws.on("error",function(){...})

gzip:

1、const zlib = require('zlib');

2、必须设置一个头：

3、通过管道

stream1.js

stream2.js

stream3.js

stream4.js

server.js

完整服务器代码:

rs.on("error",function(){...})
ws.on("error",function(){...})