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搭建高可用mongodb集群（四）—— 分片 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...
/data/mongodbtest/mongodb-linux-x86_64-2.4.8/bin/mongo 127.0.0.1:22001
#使用admin数据库
use admin
#定义副本集配置
config = { _id:"shard1", members:[
{_id:0,host:"192.168.0.136:22001"},
{_id:1,host:"192.168.0.137:22001"},
...
How to check if two arrays are equal with JavaScript? [duplicate]
...ost all cases, except that null!==undefined but they both are converted to JSON representation null and considered equal:
function arraysEqual(a1,a2) {
/* WARNING: arrays must not contain {objects} or behavior may be undefined */
return JSON.stringify(a1)==JSON.stringify(a2);
}
(This migh...
How to check that an object is empty in PHP?
...t by converting it to a pure array:
$obj = simplexml_load_file($url);
// `json_decode(json_encode($obj), TRUE)` can be slow because
// you're converting to and from a JSON string.
// I don't know another simple way to do a deep conversion from object to array
$array = json_decode(json_encode($obj),...
社会化海量数据采集爬虫框架搭建 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...习算法自动完成策略调整，保证抓取不间断。
整个抓取使用了 xpath、正则表达式、消息中间件、多线程调度框架（参考）。xpath 是一种结构化网页元素选择器，支持列表和单节点数据获取，他的好处可以支持规整网页数据抓取...
App Inventor 2 低功耗蓝牙 BlueToothLE 拓展 · App Inventor 2 中文网
...接的
是单向的，可以向任何人或者接收器发送数据。
使用广播方式通信没有任何安全措施，任何监听设备都能收到，因此它可能不适合于敏感数据，除非在广播数据中采用某种加密方法。
详细接入步骤：
设置广播扫描周...
How to redirect 404 errors to a page in ExpressJS?
.../notfound
// $ curl http://localhost:3000/notfound -H "Accept: application/json"
// $ curl http://localhost:3000/notfound -H "Accept: text/plain"
app.use(function(req, res, next){
res.status(404);
// respond with html page
if (req.accepts('html')) {
res.render('404', { url: req.url });
...
NPM clean modules
...
I added this to my package.json: "clean": "rm -rf node_modules", "reinstall": "npm run clean && npm install", "rebuild": "npm run clean && npm install && npm run build",. Seems to work well.
– Lucas...
Put content in HttpResponseMessage object?
...e my post below for creating your own derived types of StringContent (e.g. JSON, XML etc.).
– bytedev
Jan 13 '16 at 16:52
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How to Deserialize XML document
...tatic class ParseHelpers
{
private static JavaScriptSerializer json;
private static JavaScriptSerializer JSON { get { return json ?? (json = new JavaScriptSerializer()); } }
public static Stream ToStream(this string @this)
{
var stream = new MemoryStr...
Socket send函数和recv函数详解以及利用select()函数来进行指定时间的阻塞 ...
...调用者通过三种途径返回结果：状态、通知和回调。可以使用哪一种依赖于执行部件的实现，除非执行部件提供多种选择，否则不受调用者控制。如果执行部 件用状态来通知，那么调用者就需要每隔一定时间检查一次，效率就...