back end programming

A long time ago with the great God Kobe discussed this topic, the great God means to bind the data into the tag, get the data from the tag's attributes worth to the data. Re-update attributes when updating data.But I used an object data={} to save the data, just save the ID on the label, get the data to find it, and update it in addition to updating the view. Although it looks like you're writing a little bit more code,But the coupling is greatly reduced, the modularity is more readable, especia

PrivateCountdownlatch Downlatch; * $ PublicBoss (Countdownlatch downlatch) {Panax Notoginseng This. Downlatch =Downlatch; - } the + Public voidrun () { ASYSTEM.OUT.PRINTLN ("The Boss is waiting for all the workers to finish the job ..."); the Try { + This. downlatch.await (); -}Catch(interruptedexception e) { $ } $SYSTEM.OUT.PRINTLN ("The workers have finished their work, the boss began to check!") "); - }

JS in the function key word is function, note the following:function Add (NUM1, num2) {return NUM1 + num2;}1, if the incoming var sum = Add (1, 6, 7); Only 1 and 6 are taken, and the last extra parameter is ignored.2, if only add (1) is passed in, a nan is obtained because the function's formal parameter num2 is treated as undefined3, the inside of the function has a arguments array, which is used to store the parameter list passed in, as the following is all the input parameters.function Add (A

This section mainly through an adder, describes how JS debugging. First on the code:Test.html:Demo.js/** * Created by Yanzi on 15/12/8. */var NUM1 = document.getElementById ("Num1"), num2 = document.getElementById ("num2"), result = document.getElementById ("result"), Btn_add = document.getElementById ("add"); Btn_add.addeventlistener ("click" , Onaddclick, False), function Onaddclick () { var a = parseint (Num1.value), B = parseint (num2.value); var sum = Add (a, b); result

The 1th Chapter--Basic articleJS IntroductionHTML page content; CSS Web page style; JavaScript Web page behaviori.e. Hello WorldDOCTYPE HTML>HTML>Head> MetaCharSet= "UTF-8"> title>Documenttitle>Head>Body> Scripttype= "Text/javascript">document.write ("Hello, world!."); Script>Body>HTML>Two ways to use JS:1. : See above example2. JS Features:Operating environment: Browser-code that runs in the browserInterpreted language:JS DebuggingBasic SyntaxBasic TypeOperators and ExpressionsStatemen

(' d ', diff); //get Current year varYear =mydate.getfullyear (); //Get Current Month varmonth = Mydate.getmonth () + 1; //Get current day varDate =mydate.getdate (); varh = mydate.gethours ();//gets the current number of hours (0-23) varm = Mydate.getminutes ();//gets the current number of minutes (0-59) vars =mydate.getseconds (); varnow = year + '-' + P (month) + "-" + p (date) + "" + P (H) + ': ' + P (m) + ":" +p (s); returnNow ;}/** * Get current time*/functionp (s) {returnS

In the 10th week we contacted a knowledge point that we are not very unfamiliar with, generic classes. In the previous learning process, there was a generic array in the Employee class. Of course this week's study is in-depth study of what is generic, how to define, how to use. First of all, let's talk about generics , generics, or "parameterized types". When referring to a parameter, it is most familiar to define the method when the physical parameter is called and then pass the argument when c

. Yue Timor also found a different situation during commissioning:The first JS code is this:var dataset =["Enter", "Update"];var key = function (d) { return D | | this.textcontent;} var duration = 750;var div = d3.select ("Body"). SelectAll ("div") . Data (Dataset,key);that is, the dataset has an element that is identical to the existing div text content, and because the key function is a collection of datasets and div text content, it runs as follows: It is not difficult to find, here the

PreludeThere are endless questions about virtual functions, and articles about virtual functions are the same. Why should I write this article on virtual functions? After reading this article, I believe I can understand its meaning. At the same time, the original fantasy series has changed its name to the programmer's programming Art Series, because it no longer focuses only on "interview", but on "programming