strict mode

Basic concepts of JavaScript (2) --- variables and basic concepts of javascriptVariable 1. variable definition Use var in Javascript to define variables. The specific format is as follows: Var name = 1; If only the variables are declared and the

ECMA-262 defines an object as: "A collection of unordered attributes whose properties can contain basic values, objects, or functions." ”Strictly speaking, this is equivalent to saying that the object is a set of values that do not have a particular

New Features of PHP 7.0 and php7.0 ?? The operator (NULL merge operator) puts this in the first example because I think it is very useful. Usage: $ a = $ _ GET ['a']? 1; it is equivalent to: ?? Operator (NULL merge operator) Put this in the first

The This of the function refers to who, and where the function is defined, where the function is executed without a semi-gross money relationship, only follows the following rules:In non-strict mode:1, self-executing function inside, this always

in a real interview, the interviewer often uses a hard-to-use routine, and JavaScript and jquery are the most critical, as well as some of the questions about the project and the technology used, which is your essential storage! Javascript

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

　　Introduction: The core of any language is bound to describe the most basic work of the language, and the description of the content usually involves the syntax of the language, operators, data types, built-in functions and other basic concepts

The JQuery 3.0 Final edition was released. jquery 3.0 will be the future of jquery. But if you need ie6-8 support, you can continue to use the latest version 1.12. JQuery 3.0 has released its final new version recently. Since October 2014, the

1.?? Operator (NULL merge operator)put this in the first place because I think it's very useful. Usage: $a = $_get[' A ']?? 1; It is equivalent to: We know that ternary operators can be used in this way: $a?: 1

1. Operator (NULL merge operator) Put this in the first place because I think it's very useful. Usage: $a = $_get[' A ']?? 1; It is equivalent to: $a = isset ($_get[' a '])? $_get[' A ']: 1; We know that ternary operators can be used in this

SQL MODE: Defines the response behavior of mysqld to constraints, etc.:To view the current mode:mysql> SHOW GLOBAL VARIABLES like ' Sql_mode ';How to modify:mysql> SET GLOBAL sql_mode= ' mode ';mysql> SET @ @global. sql_mode= ' mode ';permissions

In JavaScript, arrays can be created using the array constructor, or created quickly using [], which is also the preferred method. An array is a prototype that inherits from object, and he has no special return value for TypeOf, and he only returns '

Many Integrated PHP environments (such as PHPnow WAMP Appserv) do not seem to have enabled the MySQL strict mode. What is the MySQL strict mode, simply put, MySQL strictly checks the data (format, length, type, and so on). For example, for an

Summary: JQuery 3.0 is finally here. The web developer community has been waiting for this major update since October 2014. It came to us in the June 2016, in the midst of thousand-million hope.JQuery 3.0 is finally here. The web developer community

there is no relationship between this point in the function and where the current function is defined or executed.The following rules are analyzed for this point:[non-strict mode]1. This is always the window in the self-executing function[Case 1]var

the objects in the ECMAScript are variableA set of keyed collections (that is, a collection of data and functions). It aggregates a number of values together, which can be accessed by name. Objects can also be considered as containers for

JavaScript Basic Syntax:ECMAScript's syntax draws heavily on the syntax of C and other C-languages.Everything in ECMAScript (variables, function names, operators) are case-sensitive.Identifier:Meaning: The name of a variable, function, property, or

In JS, this is the context in which it is directed according to its scope.Global executionIn the global context, let's see what it is:You can see that a Window object is returned.In node, this returns the global object.Summary : It executes the

JavaScriptQuick StartJavaScript code can be directly embedded anywhere in the Web page, but usually we put JavaScript code in , the included code is the JavaScript code, it will be directly executed by the browser. The second approach is to put the

Foreword I have been confused for a while and I don't know where to start learning the front-end knowledge. It seems that this status has been going on for a year, and I am also reading the front-end stuff every day, however, there is no clear