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Rails 5 Test prescriptions 10th unit_testing JavaScript (new tool, learn curve too steep, pass)

Testdouble testdouble-jasmine --devExplain:Use Yarn Package Manager to manage the standalone JS. Use yarn to load these modules. The --dev command adds these modules to the separate section in Package.json. (that is, these modules are used only in development environments, and are used for testing) tags are "devdependencies""Devdependencies": {" Jasmine": "^3.1.0", libraries that write code" Jasmine-core": "^3.1.0", libraries that write code" Karma": "^2.0.2", Command-Line Program" kar

JavaScript Advanced Programming--Learn from scratch (1)

javascript--the client Web browser scripting language.What is language?Used for communication, with complete syntax and explicit semantics .A complete set of JavaScript implementations consists of three different parts:1,ecmasript (CORE)Just a description that defines all the properties, methods, and objects of the scripting language. That is, a language has a clear code of use and use of the method.It prov

JavaScript data type Learn notes _javascript tips

specify the usage of the system with a second cardinal number. Here are the specific examples: document.write (parsefloat ("421")); 421 document.write (parsefloat ("0421.32.1"));//421.32 document.write ("0xaafd"); parsefloat document.write (parsefloat ("070"));//70 document.write (parsefloat ("070ABC"));//70 document.write (Parsefloat ("")); NaN document.write (parsefloat ("abc"));//nan String type There are two ways to convert a value to a string. The first is the ToString

JavaScript type System Window object Learn notes _javascript tips

%23start Console.log (Escape (URI));//http%3a//www.wrox.com/ Illegal%20value.htm%23start var uri = ' Http%3a%2f%2fwww.wrox.com%2fillegal%20value.htm%23start '; Console.log (decodeURI (URI));//http%3a%2f%2fwww.wrox.com%2fillegal Value.htm%23start Console.log ( decodeURIComponent (URI));//http://www.wrox.com/illegal Value.htm#start console.log (unescape (URI));//http:// Www.wrox.com/illegal Value.htm#start Eval () The eval () method is like a complete ECMAScript parser that accepts only one

JavaScript I learn a variable type

variable is undefined, there is no valid value (not yet variable, what from the talk value) Null:nothing, a variable does not refer to any object. Null is an object, type object (with variable, but no reference value)var NULL ; if NULL {alert (// This sentence will be executed }else {alert ("Obj!=null");} Alert (typeof//ObjectUndefine and null judgments, etc.varMyVar;//trueConsole.log (typeofMyVar = = = "undefined"); Console.log (MyVar===undefined); varMYVAR2 =NULL; Console.log (typeofMYVAR2);

Rookie Learn JS (four)--javascript for the button to register the return event (set the default button)

Have to say, in the JS aspect, oneself really is a genuine rookie. For JS and some JS framework such as jquery JS frame, oneself is just in the stage of simple application, of course, oneself also in continuous learning, hope in the future can share with you more JS experience. Let's start with an appetizer today. How to set a default button, that is, whether the focus is not on the button, just press ENTER, it is equal to trigger the button click event.The code is very simple, just a few lines

Learn about the uses of C + +, Java, JavaScript, PHP, Python

these documents to achieve some client dynamic effects. JS's territory is not only so, now node. JS can also be used for server-side development.Main do: Front-end development of the website Show off all kinds of cool pictures PhpBottom line: "PHP is the best language in the world" of course, it's just a terrier.PHP is mainly: Network Front end Used to generate Web pages Web server: Forum engine Python"Life is short, I use Python."Python has a rich and po

(v) Learn the FirstChild properties of JavaScript

Reference: http://www.w3school.com.cn/jsref/prop_node_firstchild.aspDefinition and usageThe FirstChild property returns the first child node of the specified node, to the Node object.Note: In HTML, the text itself is the parent node of the HTML element, and the HEAD and BODY are child nodes of the HTML element.Instance:"Div">"Demo"> Click the button to get the node name of the first child node in the document. "myFunction ()"> Try (v) Learn the FirstC

JavaScript Advanced Programming--Learn from scratch (3)

Object Basics1. OOP2. Object Application3. Type of Object3.1 Local objectsECMA-262T defines local objects (native object) as "objects provided by ECMAScript implementations that are independent of the hosting environment." In simple terms, a local object is a class ( reference type ) defined by ECMA-262.They include:    Object Function Array String BooleanNumber Date RegExp Error evalerrorRangeerror referenceerror syntaxerror TypeError urierror3.2 Built-in objectsECMA-262 defines the built-in ob

Learn JavaScript from the beginning (v)--operator (ii)

type is differentV. Conditional operatorsvariable = conditional expression? Truth value: false valuesThe conditional expression is evaluated first, and if the result is true, the truth is assigned to the variable, and if False, the value is assigned to the variable.1 Six, assignment operators1. Simple assignment Operator: =var num1 = ten; num=num1+10;2. Compound assignment operator: + =,-=, *=,/=,%=, >>=, >>>=1Seven, comma operatorThe comma operator can perform multiple operations in a single s

JavaScript get current time-Learn notes

JavaScript get current time-Learn notes

Learn about JavaScript Design Patterns (Agent mode) _javascript tips

(","));//2s send to the ontology a collection of IDs to be synchronized cleartimeout ( timer); Empty timer = null; cache = []; Clear-Sky timer },2000); } (); Binding point Click event var checkbox = document.getelementsbytagname ("input"); for (Var i= 0, C; c = checkbox[i++];) { C.onclick = function () { if (this.checked = = True) { //file synchronization using proxy proxysynchronousfile (this.id ); } } } Second, the caching agent Cac

JavaScript I learn six objects factory functions and constructors

//true A //trueSo, you can use Arguments.callee directly1 //Avoid forgetting new2 functionMyObject (value) {3 if(! ( This instanceofArguments.callee)) {4 //if the caller forgets to add new, add new to call again5 return NewMyObject (value);6 }7 This. Prop =value;8 }9 //TestTen varObj

JavaScript learn to get URL parameters

('? ')); varHashindex = Url.indexof (' # ') ===-1?url.length:url.indexof (' # ')); varSearchstr = Url.slice (searchindex+1, Hashindex); varSearcharr = Searchstr.split (' ')); for(vari=0;i){ varElearr = searcharr[i].split (' = ')); result[elearr[0]] = elearr[1]; } returnresult;}Of course, most of the actual project is based on a parameter name to get the value of the parameter in the current URL, implemented as follows:function getsearchstring (name) { varnew RegExp ("(^|)" + name + "= ([

Every day, Bootstrap must learn the Tab (Tab) Plug-In _ javascript skills-js tutorial

fade-out effect fade, while in indicates that the preferred content is displayed by default.// You can also replace it with a capsule // Data-target Data-target binding or not binding works the same. // Use JavaScript to directly use the tab method. $ ('# Nav '). on ('click', function (e) {e. preventDefault (); $ (this ). tab ('show ');}); // Event, which is similar to $ ('# nav A'). on ('Show. bs. tab', function () {alert (' triggered wh

Learn JavaScript natively in minutes

JavaScript is an object-and event-driven, client-side scripting language that consists of the ECMAScript---------------standard syntax BOM (Browser Object Model) Dom (document)------- Browser-provided extensions Api:application programming Interface application Interface JS Introduction, internal and external, preferably placed in the body of the Learn JavaScript

JavaScript Basics Review/re-learn

" on the page, you can see "object" on the screen and usehref= "javascript:void (window.open (' About:blank ')")>click me a>void causes window.open () to return a undefined,undefined that is not a valid value and is not displayed in the browser window.Note: The "object" condition is not present in the high-version browserPre increment/decrement operator ++/--operatorThe addition and subtraction is performed before the expression is evaluated, so it has been added to the execution of the express

Rookie Learn JS (four)--javascript for the button to register the return event (set the default button)

; functioncalculate () {vara=document.getElementById ("Pre-tax"). Value; if(parseint (a)>8000) {document.getElementById ("Interest"). Value= -+(A- 8000)* the/; } Else{document.getElementById ("Interest"). Value=a/Ten; } } //registering key events for the KeyListener methodDocument.onkeydown=KeyListener; functionKeyListener (e) {//when you press ENTER, execute our code if(E.keycode== -) {calculate (

JavaScript daily must learn the cycle _javascript skills

Hello, friends, today, we go on to the previous content, we have already talked about the conditional branch, today we talk about the cycle, as the name implies, repeat the same operation, the normal cycle is controlled, abnormal situation, there will be a dead loop, that is our code in the bug, that, We have to learn to adjust the bug, after we finish the basic knowledge, I will devote space to explain the debugging in the browser, that program will

Follow me to learn JavaScript for loops and for...in loops _javascript tips

hasOwnProperty () is not a mistake. Depending on the task and how confident you are with the code, you can skip it to increase the speed of the loop. But when you're unsure about the current object's content (and its prototype chain), adding hasOwnProperty () is more insurance. A formatted change (jslint) simply ignores the curly braces and places the IF statement on the same line. The advantage is that the loop statement reads like a complete idea (each element has one of its own attribute "X

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