null or undefined

jQuery.proxy()function is used to change the context of a function .You can pass the specified function into the function, which returns a new function whose execution code is unchanged, but the context (this) inside the function has been changed to

2017.7.12 Beijing Volts First daySummary of the day:1. The online server often displays the. woff File loss resolution (IIS server)Add a MIME type to add three articles:file name extension MIME type　. svg Image/svg+xml. Woff Application/x-font-woff.

Directory1. The basic use of jquery extendThrough 285 lines of source jquery.extend = JQuery.fn.extend = function() { , the Extend method is either a static method that hangs directly into JQuery, Either the attached to FN is actually the instance

1 finding the largest element in a numeric array (using the Math.max function)Math.max.apply (this, arr)View Code2 Convert a numeric array into a function array (each function pops up the corresponding number) for (var i=0;i) { var tmp=Arr[i];

About jquery:jquery is a fast, concise JavaScript framework, an excellent JavaScript code base ( or JavaScript framework ). The purpose of jquery design is "write Less,doMore", which advocates writing less code and doing more things.The advantages

map()Method creates a new array with the result that each element in the array invokes a supplied function and returns the result.Let numbers = [1, 5, ten, 2= Numbers.map ((x) + = {return x *;}); // Doubles is now [2, ten , +] // numbers is still [

Previous wordsFunctions are special objects in JavaScript and can have properties and methods, just as normal objects have properties and methods. You can even use the function () constructor to create a new function object. This article is an

ECMAScript includes two different types of values: the base data type and the reference data type.The base data type refers to simple data segments, which refer to objects that have multiple values.When we assign a variable to a variable, the parser

The This keyword is a very special keyword in Javascript that is automatically defined in the scope of all functions. This provides a more elegant way to implicitly "pass" a reference to an object. For today, this is the point of this question.This

Reference typeA reference type is a data structure that organizes data and functionality together.Reference type: Describes the properties and methods that a class of objects have, and an object is an instance of a particular reference type.1.Object

Use Axios first to download the Axios module packageInstall Axios--saveSecond, you need to introduce the file in useImport Axios from ' Axios 'One, the invocation of Axios common two methods (here using the Easy-mock analog data Interface): //

Learning Goals1. Mastering The data types of JavaScript2. mastering The typeof operator3. Mastering Undefined4. Master Nulldata types for JavaScriptThere are 5 simple data types (also known as basic data types) in ECMAScript:Undefined, Null,

Axios is a promise-based HTTP library that supports blocking requests and responses, automatically converting JSON data, and clients supporting defenses? XSRF. # # InstallationUsing NPM:$ npm install axios# # GETThere are two ways of performing

Call and applyobj.call(thisObj, arg1, arg2, ...);obj.apply(thisObj, [arg1, arg2, ...]);Both of these functions are obj bound to (that is, this) to thisObj , this thisObj time have obj the properties and methods. Or, thisObj "inherited" obj

In ECMAScript, a reference type is a data structure used to organize data and functionality together, while an object references an instance of a type.Although ECMAScript is technically an object-oriented language, it does not have the basic

Data type in JS: Undefined,string,number,boolen,function,object (null,[],{})I, parseint () and parsefloat ()The parseint () method first looks at the character at position 0, determines if it is a valid number, and if not, the method returns Nan,

Original: Learn JavaScript from the beginning (v)--operator (ii)One, multiplicative sex operator1. Multiplication: *Some special rules for multiplication operators: If the operand is a numeric value, it is calculated by normal

Before the article said about JS, Bo Master is very lazy, has not written, today is free to come to the water now (this article only for JS First order, I also very dishes, can not tell what high-end goods)Today JS is developing fast: TIOBE January 2

/*1, JS arrays, like arrays in other languages, are an ordered list of data, but the difference is that each item of the JS array can hold any type of data. And the size of the JS array can be dynamically adjusted. 2. Create array: *///(1) Create an

E Cmascript 5 first introduced the concept of "strict mode" (strict). With strict mode, you can get inside the functionSelect to perform a more rigorous global or local error condition detection. The advantage of using strict mode is that you can