Node.js其他模块

var os = require(‘os‘);
//返回一个指向操作系统默认临时目录的字符串 如果需要临时存储文件，然后再删除可以放在这
console.log("tmpdir :\t" + os.tmpdir());
//根据机器的体系结构，对于大端和小端编码，分别返回BE或LE
console.log("endianness :\t" + os.endianness());
//机器的主机名
console.log("hostname :\t" + os.hostname());
//操作系统类型字符串类型
console.log("type :\t\t" + os.type());
//平台名称 字符串类型
console.log("platform :\t" + os.platform());
//体系结构 字符串类型
console.log("arch :\t\t" + os.arch());
//操作系统发布版本
console.log("release :\t" + os.release());
//操作系统已经运行多久，返回以秒为单位的时间戳
console.log("uptime :\t" + os.uptime());
//在基于UNIX系统中，返回一个包含[1,5,15]分钟的系统负载值得数组
console.log("loadavg :\t" + os.loadavg());
//系统内存容量 字节单位
console.log("totalmem :\t" + os.totalmem());
//可用的系统内存 字节单位
console.log("freemem :\t" + os.freemem());
//EOL包含操作系统相应的行尾字符,用在处理字符串数据时，使一个应用程序跨平台兼容
console.log("EOL :\t" + os.EOL);
//返回描述了model（型号）、speed(速度)和time(时间)的对象的数组，此数组包含CPU已经花费在user、nice、sys、dle、irq上的时间
console.log("cpus :\t\t" + JSON.stringify(os.cpus()));
//返回一个对象数组，描述绑定到操作系统中的每个网络接口上的address(地址)和family(地址族)
console.log("networkInterfaces : " + 
            JSON.stringify(os.networkInterfaces()));

tmpdir :    C:\Users\ADMINI~1\AppData\Local\Temp
endianness :    LE
hostname :    Lenovo-PC
type :        Windows_NT
platform :    win32
arch :        x64
release :    10.0.10240
uptime :    857903.0353439
loadavg :    0,0,0
totalmem :    4202979328
freemem :    609837056
EOL :    

cpus :            [{"model":"Intel(R) Core(TM) i5-4200M CPU @ 2.50GHz","speed":2494,"times":{"user":14228468,"nice":0,"sys":16551359,"idle":266524781,"irq":3004875}},{"model":"Intel(R) Core(TM) i5-4200M CPU @ 2.50GHz","speed":2494,"times":{"user":13634187,"nice":0,"sys":17665812,"idle":266004171,"irq":5612906}},{"model":"Intel(R) Core(TM) i5-4200M CPU @ 2.50GHz","speed":2494,"times":{"user":14396953,"nice":0,"sys":17213171,"idle":265694046,"irq":2041984}},{"model":"Intel(R) Core(TM) i5-4200M CPU @ 2.50GHz","speed":2494,"times":{"user":15294390,"nice":0,"sys":19912703,"idle":262097078,"irq":2563078}}]
networkInterfaces : {"WLAN":[{"address":"fe80::ec29:33b8:7d3d:28e0","netmask":"ffff:ffff:ffff:ffff::","family":"IPv6","mac":"48:5a:b6:d5:44:8f","scopeid":16,"internal":false},{"address":"192.168.1.103","netmask":"255.255.255.0","family":"IPv4","mac":"48:5a:b6:d5:44:8f","internal":false}],"Loopback Pseudo-Interface 1":[{"address":"::1","netmask":"ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff","family":"IPv6","mac":"00:00:00:00:00:00","scopeid":0,"internal":true},{"address":"127.0.0.1","netmask":"255.0.0.0","family":"IPv4","mac":"00:00:00:00:00:00","internal":true}],"本地连接* 13":[{"address":"2001:0:5ef5:79fb:3079:3794:c272:4da6","netmask":"ffff:ffff:ffff:ffff::","family":"IPv6","mac":"00:00:00:00:00:00","scopeid":0,"internal":false},{"address":"fe80::3079:3794:c272:4da6","netmask":"ffff:ffff:ffff:ffff::","family":"IPv6","mac":"00:00:00:00:00:00","scopeid":9,"internal":false}]}

Process finished with exit code 0

//util.format(format,[....])
//util.format(format,[....])接收一个格式化字符串作为第一个参数，并返回一个格式化后的字符串
//占位符类型:%s:指定字符串  %d:指定一个数值(可是整数或浮点数) %j:指定一个JSON可转换为字符串的对象
//%：如果%后保留为空，则不作为占位符
//同时有几个要注意的地方:
//1.占位符比参数多时，多余的占位符如%s都不会被替换
//2.参数比占位符多时，多余的参数被转换为字符串，然后用空格分隔符连接
//3.如果第一个参数不是一个格式字符串，那么会把每个参数都转换为字符串，用空格分隔符将其连接起来，并返回
var result=util.format(‘% s=%s‘,‘abc‘);
console.log(result);
result=util.format(‘%s=%s‘,‘abc‘);
console.log(result);
result=util.format(‘%s‘,‘abc‘,‘def‘);
console.log(result);
result=util.format(‘1‘,‘abc‘,‘def‘);
console.log(result);

% s=abc
abc=%s
abc def
1 abc def
4 Apr 19:40:47 - 1 abc def

Process finished with exit code 0

var  result=util.isArray([1,2,3]);
console.log(result);
result=util.isNull(result);
console.log(result);
result=util.isDate(new Date());
console.log(result);

true
false
true

Process finished with exit code 0

 ‘util.exec is deprecated. Use child_process.exec instead.‘
 ‘util.print is deprecated. Use console.log instead.‘
 ‘util.puts is deprecated. Use console.log instead.‘
 ‘util.debug is deprecated. Use console.error instead.‘
 ‘util.error is deprecated. Use console.error instead.‘
 ‘util.pump is deprecated. Use readableStream.pipe instead.‘

var  obj={first:‘brad‘,last:‘dayley‘};
obj.inspect=function(depth){
    return ‘{name:"‘+this.first+" "+this.last+‘"}‘;
};
console.log(util.inspect(obj));

{name:"brad dayley"}

Process finished with exit code 0

var dns = require(‘dns‘);
console.log("Resolving www.baidu.com . . .");
dns.resolve4(‘www.baidu.com‘, function (err, addresses) {
  console.log(‘IPv4 addresses: ‘ + JSON.stringify(addresses, false, ‘ ‘));
  addresses.forEach(function (addr) {
    dns.reverse(addr, function (err, domains) {
      console.log(‘Reverse for ‘ + addr + ‘: ‘ + JSON.stringify(domains));
    });
  });
});

Resolving www.baidu.com . . .
IPv4 addresses: [
 "14.215.177.38",
 "14.215.177.37"
]
Reverse for 14.215.177.38: undefined
Reverse for 14.215.177.37: undefined

Process finished with exit code 0