javascript underscore

Coffeescript or similar languages, and I stop reading as soon as I encounter them in very few cases, because I'm only interested in JavaScript, not other versions of it.If you've ever planned or are interested in working with JavaScript-based databases such as MongoDB, then you need to know how to write JavaScript. You can't use Coffeescript to query MongoDB, no

4th is the naming convention .we usually need to name our variables and functions in the same way, here are some rules:(1) Write the constructor in uppercase letters. Although JavaScript does not have a class, there is a constructor for the new call,For example, var adam = new person (), so that we can just look at the function name to know if the function is a normal function.(2) Divide the word. When our variables or function names have multiple wo

not overwritten when they are bound. Event bindingIn addition, we can also customize the changed data type to be bound: object.on(event, callback, [context]) Bind a callback function to an object and execute the callback function when the event is triggered: listenTo IstenTo Model collectorBackbone. CollectionA set is an ordered combination of models. We can bind a "change" event to the set to receive notifications when the model in the Set changes, the collection can also listen to "add"

());// -Console.log (_.sub ());//6function expressions that are called immediatelyIn the above two examples, anonymous function expressions are used, and are executed immediately. If you look at JavaScript code for some open source libraries, such as jquery, underscore, and so on, you will find similar anonymous function code that executes immediately.A function expression that is called immediately is usu

Beauty ("$Class", ["$underscore"],function (_) {var Class = function () {var length = Arguments.length; var option = arguments[length-1]; Option.init = Option.init | | function () {}; If the parameter has a parent class to inherit if (length = = = 2) {/** * @ignore */var superclass = Arguments[0].extend; /** * @ignore * */var tempclass = function () {}; Tempclass.prototype = Superclass.prototype; /** * @

As we all know, in c and java, the main function provides the main method as the entry function or method of a program. Starting from the header of the JS source file in js, we can still create a main function as the starting point of the program, so that it can be integrated with other languages, and you may have a deeper understanding of JS. If you are interested, you can learn it with xiaobian. In C and Java, there is a program entry function or method, that is, the main function or main meth

Document directory Syntax for creating a function: Example A function is an event-driven or reusable code block that is executed when it is called.Instance Function How to call a function. Functions with Parameters How to pass a variable to a function and how to use the variable in the function. Function 2 with Parameters How to pass multiple variables to the function, and how to use these variables in the function. Return Value Function

should be a base type, the action typeof check its type If you want the object to contain a specific method name, use the typeof operator to ensure that the method that specifies the name exists on the object Avoid global volume The global variable should be all uppercase and each word is connected by an underscore. Avoid global variables and functions as much as possible, minimizing the use of global variables because all

You can create three message boxes in javascript: Warning box, confirmation box, and prompt box.Instance Warning box Warning box with lines Confirmation box Prompt box Warning box The warning box is often used to ensure that users can obtain certain information. When a warning box appears, you must click OK to continue the operation.Syntax: Alert ("text ")Confirmation box The confirmation box enab

Document directory 1: 2: An array object uses a separate variable name to store a series of values.Instance Create an array Create an array, assign values to it, and then output these values. For... in statement Use the for... in Declaration to cyclically output the elements in the array. Merge two Arrays-Concat () How to Use the Concat () method to merge two arrays. Using array elements to form a string-join () How to Use the join ()

The string object is used to process existing character blocks. Javascript string object instance Calculate the length of a string How to Use the Length attribute to calculate the length of a string. Add a style to a string How to add a style to a string. Indexof () method How to Use indexof () to locate the first occurrence of a specified character in a string. Mat

First, why use Require.js. At the earliest, all of the JavaScript code was written in a file, and it was enough to load the file. Later, more and more code, a file is not enough, must be divided into multiple files, sequentially loaded. The following page code, I believe many people have seen. This code loads multiple JS files sequentially. There are a lot of drawbacks to this way of writing. First of all, when loading, the browser will stop the page

First, why use Require.js. At the earliest, all of the JavaScript code was written in a file, and it was enough to load the file. Later, more and more code, a file is not enough, must be divided into multiple files, sequentially loaded. The following page code, I believe many people have seen. This code loads multiple JS files sequentially. There are a lot of drawbacks to this way of writing. First of all, when loading, the browser will stop the page

JavaScript-the most misunderstood language analysis JavaScript in the world is one of the world's most popular programming languages. . In fact, every personal computer in the world is installed and at least one Jav is frequently used. AScript interpreter. The popularity of JavaScript is entirely due to his The position in the WWW scripting language field is dete

to declare objects. var derp= "one"; var herp=function () { This.derp= "two"; } var foo=herp (); alert (DERP); If you write this, JavaScript doesn't care, and the answer you really pop up is "two"! There are many ways to prevent objects from doing this, and you can use instanceof, but the better way is to use the new keyword correctly, which is more professional. Now you know that your

, JS code and symbols are entered in the English state.2. Although the semicolon ";" can also not write, but we have to develop a good habit of programming, remember to write a semicolon at the end of the statement.javascript-notes are importantA single-line comment, with the symbol "//" before the content of the comment.Multiline comments start with "/*" and End with "*/".javascript-What is a variableFrom a programming standpoint, a variable is a mem

ESLint or in the JSHint camp, but JSLint was unexpectedly strong after so many years, with nearly 30%. 13. How do you handle client dependencies? Npm voted 60% as the first choice for the client dependency management system. Bower still has a 20% share, while the old 14. What is your preferred build script solution? The build tool has different options, in part because there are many options. Gulp is the most popular, with more than 40% votes. Followed by npm run, which is 27.8%, and Grunt w