what variable declaration

Variable ScopeA scope is a region of a program, and there are generally three places where you can declare a variable: A variable declared inside a function or a block of code, called a local variable. A variable declared in the

Variable ScopeA scope is a region of a program, and there are generally three places where you can declare a variable: A variable declared inside a function or a block of code, called a local variable. A variable declared in the

1.JS ScopeIn ES5, JS has only two forms of scope: global scope and function scope, and in ES6, a new block-level scope (the scope of the most recent curly braces) is added, but only the variables declared by the Let way are limited.2. Variable

 Tags: javascript function objectsThis blog post solves the following confusion function declaration why the predecessor function declaration pre-and variable pre-precedence issues Why the JS file can be used at the beginning of the

Scope (scoping)The JavaScript scope is confusing because its program syntax itself is long like the C-family language. My understanding of scopes is a closed space that only has an effect on a range and does not have an impact on the outside. In

Previous wordsIf an expression is a phrase in JavaScript, then the statement (statement) is a JavaScript whole sentence or command. An expression evaluates a value that the statement uses to execute to make something happen. A JavaScript program is

1, investigate thisvar length = 10function fn () {Alert (this.length)}var obj = {Length:5,Method:function (FN) {fn ()//?Arguments[0] ()//?}}Obj.method (FN)The pit here is mainly arguments, we know that the object belongs to the exception of the

Indent is the next most powerful code-finishing software in Linux, which makes it easy to write code with very good style. To view the/usr/src/linux-headers-/scripts/lindent file, you can see a line of

Observe the following two sections of code and try to write the result of hello (' word '):// variable-type declaration function Hello (msg) { alert (msg); var function (){}; Alert (msg);} // Functional Declarations function Hello (msg) {

1. Scope chain 1.1. What is a scopeTalking about the scope chain, we have to start from the scope. Because the so-called scope chain is made up of multiple scopes. So, what is a scope?1.1.1 Scope is the execution environment of a function during the

1, investigate this var length = 10function FN () {    alert ( this .length)} var obj = {    length: 5,    method: (FN) {FN () Span style= "color: #008000;" >//         arguments[0] () // ? }} Obj.method (FN) The pit here is mainly

1. Review this1 varLength = 102 functionfn () {3Alert This. Length)4 }5 varobj = {6Length:5,7Methodfunction(FN) {8FN ()// ?9Arguments[0] ()// ?Ten } One } AObj.method (FN)The pit here is mainly arguments, we know that the object belongs to the

Two days before the class party, in addition to eat and drink is sleeping, is a joy, is really a lonely lele than the public Lele ah. PS: Graduated or about to graduate have time to get together, after the industry belongs to their own time to get

Scope (scoping) One of the most confusing places for JavaScript beginners is the scope; in fact, not just beginners. I've seen some experienced JavaScript programmers, but they don't understand scope very deeply. The JavaScript scope is confusing

Linux kernel has a script lindent, nothing can be installed, sudo apt-get install indent can help you format your code with a good code style.such as:/usr/src/linux-headers-2.6.22-14/scripts/lindent Common

This is my final set of front-end interview questions, used to assess the overall ability of the interviewer's JavaScript, it is a pity that nearly two years so far, almost no one has been able to correct correctly, not too difficult just because

The original text comes from the basics of writing high quality JavaScript code, which is the global variables issue for the sorted notes var a = 5; function func () { b = 6; Do not recommend }Variables that are created with VAR using var

Original: http://www.adequatelygood.com/JavaScript-Scoping-and-Hoisting.html= = = Translation starts = = =Do you know what the following JavaScript script execution results are?1 var foo=1; 2 function Bar () {3 if (! foo) {4 var foo=10; 5

In JavaScript, functions are defined in two ways, function definition expressions and function declarations, as shown in the following examples:var test = function (x) {return x;}function test (x) {return x;}Although function definition expressions

First, there are two ways to create functions in JavaScript, function declarations, function expressions, and so on.1, function declaration.function Boo () { console.log (123);} Boo ()2, function expression.var function () { console.log