graceful chameleon

Here is a bit exaggerated, a little hanging, just casually say that they write a graceful way to JS.Using jquery to develop, now very popular, greatly increased speed, but also can improve the quality of the code.1, $.extend ()// ... -- indicates code function demo (opts) {var defualtopts={...}; OPTs=$.extend ({},opts,defaults); ... } /* use good $.extend () can be very good to pass parameters, look good beautiful */2

the total space size:$${r_{sample2d}} = {1 \over 4}$$So can continue to recursion, imagine, if you think in the high-dimensional space sample is a super-sphere (like a watermelon), then some out of the field, in our less care of the rind part, is occupied the vast majority of space.In front of these, is a primer, our understanding of the high-dimensional space is much more insensitive than we think, and it is very ironic that we are faced with the problem is often high-dimensional data, our app

This time write in Chinese, express clearly.Recently saw a few procedures, combined with their own thinking, give the Golang service its graceful shutdown processing way. The HTTP server is described here as an object.Here the "elegance", indicating that the server has a plan, step-by-step exit. Specifically, it terminates the connection with the client, closes the process of other activities, threads, and completes the release of the resource; comple

These two concepts are popular with CSS3,Progressive enhancement: Build the page for the lower version first to ensure the most basic functionality. Then optimize for a high-level version to improve the user experience.Graceful downgrade: Build the full functionality from the beginning and then be compatible with the low-version browser.GoThe "Graceful downgrade" viewThe "Graceful downgrade" view is that th

Linux under graceful let the program run in the backgroundIf you start running a program on the terminal, run for a few days, if you accidentally turn off the terminal, then the program will be terminated, this is the reason for the sighup signal, even though the BG set for the background to run the same way, should let the program become a daemon, the steps are as follows:1.ctrl+z suspend the operation of the program, you can see the program's job nu

experiencing something or facing someone, and (3) adopting an attitude in the face of unavoidable suffering. The first is achievement or success, the meaning of which is obvious. The second way to find the meaning of life is by experiencing something-like goodness-by experiencing nature and culture or by experiencing the uniqueness of another person-that is, to love someone. In a sense, once the meaning is found (such as the meaning of sacrifice), pain is no longer painful. This is one of t

does spark streaming stop?　　　　　　　The above stop mode will stop this streams, but will not wait for all data processing to complete by default Sparkcontext will also be stopped.　　Use the Stopgracefully method to process:　　　　　　　　When the application starts, it calls Stoponshutdown, and the callback is passed in.　　　　If the prompt data is not processed, it is stopped:　　　　Summary: Using stopgracefully all received data will be processed to complete before it is stopped.Note: Da

Zero Returns immediately. Give up immediately. Send the RST packet directly, reset itself immediately, without going through the 2MSL state. The peer receives a reset error number. Non-Zero Non-Zero Block until the L_linger time expires or the data is sent to completion. (Sockets must be set to block Zhuan) Keep trying to send within the time-out period, and discard it immediately if it expires. Timeout is the same as the second case, if th

violence ~Reference code:#include intMainvoid){ inti,i1,i2,i3,i4,i5,i6,i7,i8,i9,t,m,n,z; scanf ("%d",T); while(t--) {scanf ("%d%d",m,N); for(z=1, i=0; i){ if(n==1 i==m) z++; for(I1=i; N>1, i1){ if(n==2 i+i1==m) z++; for(I2=I1; N>2, i2){ if(n==3 i+i1+i2==m) z++; for(I3=I2; N>3, i3){ if(n==4 i+i1+i2+i3==m) z++; for(I4=I3; N>4, i4){ if(n==5 i+i1+i2+i3+i4==m) z++; for(I5=I4; N>5, i5){

process after the old process exits, but continues to serve. So step by step, the key is to start from the beginning of the 2nd step, so we first look at the implementation of the 2nd step, this should be said to be very simple, send the semaphore to a process, using the KILL command, on Facebook This project sent a semaphore of 3: Sigint,sigterm, SIGUSR2, the first two signals received after the program will exit directly, the latter signal SIGUSR2 will perform the so-called

Progressive enhancement: First of all to ensure that the core of the implementation of the function, so that any bottom browser can see the site content,Then consider the use of advanced but not necessary enhancements such as CSS and JavaScriptGraceful downgrade: Consider whether the user of the bottom device can see all the content,Based on this, the design for high-end users, not only the high-end equipment users to provide a perfect application,Also to design different levels of less-than-per

processing object, intercept the DAO layer object before use, switch the data source conveniently, if there is no data source annotation, set as default. So for the first data source in the original project DAO layer object, there is no need to make any modifications, the slice processing is as follows. @Before ("Cut ()") publicvoid dobefore (joinpoint joinpoint) { = Joinpoint.gettarget (). GetClass (). Getannotation (DataSource. Class); null ? datasource.value (): Dbso

Recently, the Springboot project was used in the company, and it was found that the Java-jar command on Linux is very safe to run, but when we need to close it? Does the login server kill thread???Found the relevant documents on the Internet: https://www.cnblogs.com/lobo/p/5657684.html This article explains in more detail two ways to close springboot projects.However, after using the above method, it is found that there are some strange anomalies when the springboot is closed.What about this???F

automatically when the supervisor detects that the service process is finished. 1234567891011121314151617181920212223242526272829303132333435363738394041 import signalimport tornado.ioloopimport tornado.httpserverhttp_server = Nonedef sig_handler(sig, frame):"""信号处理函数"""tornado.ioloop.IOLoop.instance().add_callback(shutdown) def shutdown():"""进程关闭处理"""# 停止接受Client连接global http_serverhttp_server.stop()io_loop = tornado.ioloop.IOLoop.instance()deadline = time.time() + 10 #设置最长强制结

With the development of Internet technology, the era of vector images of Android has come. In Google's newest support library v23.2, the AppCompat class has already used vector images, which reduces the AAR package by 9%, about 70KB, to all the newer applications. Of course, we can also use vector, slimming application. Vector images are the manifestation of the SVG format in Android. SVG image adaptation screen, the picture is small, there are many advantages, reference. The analysis of vector

run example-2.go启动ctrl+c退出,输出退出信号 interruptkill pid 输出退出信号 terminatedkill -USR1 pid 输出退出信号 user defined signal 1kill -USR2 pid 输出退出信号 user defined signal 2 3. Gracefully exit the Go daemon Package Mainimport ("FMT" "OS" "Os/signal" "Syscall" "Time")//Graceful exit Go daemon func main () {//Create Listen quit Chan c: = Make (chan os. Signal)//monitor the specified signal CTRL + C kill Signal. Notify (c, Syscall. SIGHUP, Syscall. SIGINT, Syscall. SIG

//implement array each (loop array for each item)var arr=[1,3,4,2];Arr.foreach (function (item,index,array) {//alert (item); });var arr2=[1,3,23,[12,[13,[45]];array.prototype.each=function (FN) {//destination iterates over each item of an arraytry{//Counter records the position of the currently traversed elementthis.i| | (this.i=0);//Judge when to enterif (this.length>0fn.constructor==function) {//Iterate through each item of the arrayWhile (this.i//Get an array of each itemvar e=this[this.i];//

external call is hijack, the final state. Stateclosed: Indicates that the connection has ended, and the final state. In general, we do not enter the state of hijacked (if WebSocket is considered), so a possible hook function is as follows, refer to http://rcrowley.org/talks/gophercon-2014.html s.ConnState = func(conn net.Conn, state http.ConnState) { switch state { case http.StateNew: // 新的连接，计数加1 s.wg.Add(1) case http.StateActive: // 有新的请求，从idle conn pool中移

In the development of commercial applications, the first time users enter the app, there is a feeling that we as developers to provide users with some guidelines,These guidelines do not allow users to look abrupt, to be comfortable to display to the user, with the user happy to use our app.How to make the user comfortable? We can't just pop up a alterdialog, which will scare your users away, so let's be gentle.Let's have a fuss over the whole window.We were able to implement this tip on the defi

, 6000 that is 6 seconds. 3. Animated-vector imageThe path of the vector image is applied to the path animation (Objectanimator), which controls the drawing."http://schemas.android.com/apk/res/android" android:drawable="@drawable/v_heard"> "heart1" android:animation="@animator/heart_animator"/> "heart2" android:animation="@animator/heart_animator"/> ...4. Display animationsAndroid 5.0 (21) or later is required to use vector animations, the animatedvectordrawable cl