strict mode

JavaScript Strict mode (use strict)JavaScript rigorous mode (strict mode) is run under strict conditions.Using the "Use strict" directiveThe "Use strict" directive was added in JavaScript 1.8.5 (ECMASCRIPT5).It is not a statement, but it is a

First, Strict mode 1, ECMASCRIPT5 introduced the concept of strict mode (strict mode). The intent is to define a different parsing and execution pattern for JavaScript.2.Different in strict mode:    (1),Some indeterminate behavior will be dealt with.

The "IT168 technology" Sql_mode may be a variable that is easier for developers and DBAs to ignore, and is empty by default. The Sql_mode setting is actually a more risky setting because it allows for some illegal operations, such as inserting null

Sql_mode may be a variable that is easier for developers and DBAs to ignore, and is empty by default. The Sql_mode setting is actually a more risky setting because it allows for some illegal operations, such as inserting null into a NOT null field,

Today, JavaScript has become the core of web page editing. Especially in the past few years, the Internet has witnessed the emergence of a large number of JS libraries in SPA development, graphics processing, and interaction. If you deal with it for

JavaScript specification for front-end coding style specifications and front-end javascriptJavaScript specification global namespace pollution and IIFE Always wrap the code into an IIFE (Immediately-Invoked Function Expression) to create an

The next step is BOM and HTML5, but since ECMAScript5 has many new changes compared with ECMAScript3, these changes are also very interesting, therefore, in this article, I will focus on the interesting changes I think (not all changes), but here I

1. PropertiesThere are two types of properties in ECMAScript: Data properties and accessor properties.　　First, data propertiesThe Data property contains the position of a data value, where the value can be read and written.var person = {Name:

Original: https://www.cnblogs.com/ys-ys/p/5158510.html--------------------------------------------------------------------------------Thank you for this good article from the Broken Wolf, as well as the authors who wrote these points of knowledge

1. What is this? 1.1 Context (Global context)In the global run context (outside any function body), this refers to theGlobal Object window, whether in strict mode or not.Alert (this// true alert (this// true ThisPNS// PNSThis default is to

Then there should be BOM and HTML5, but given the new changes in ECMAScript5 relative to ECMASCRIPT3, and these changes are also very interesting, so in this article I think of the interesting changes (not all changes) to focus on, but here is just

One: the role of Sql_modeSql_mode is a very easy to ignore variable, the default value is a null value, in this setting can allow some illegal operation, such as allowing some illegal data insertion. This value must be set to strict mode in the

Brief: Strict mode (strict modes) is a new encoding mode in JavaScript ES5, as long as a line of code can be opened, it is very simple, and it is what is the difference in our code?First, the purpose of strict mode?1, eliminate some of the

First, global namespace pollution Always wrap the code inside an immediate function expression to form a separate module. Not recommended var x = ten, y = m; Console.log (window.x + ' + window.y '); Recommended ;(function

One: the role of Sql_modeSql_mode is a very easy to ignore variable, the default value is a null value, in this setting can allow some illegal operation, such as allowing some illegal data insertion. This value must be set to strict mode in the

Original address:1). JavaScript Best practices:http://www.w3schools.com/js/js_function_closures.asp2). JavaScript Closures http://www.w3schools.com/js/js_function_closures.asp3). JavaScript Strict Mode http://blog.csdn.net/supersky07/article/details/

In this article, I wanted to write more test cases. But a lot of tests have been done because of ash.   What is eval. I personally think that the initial design of Eval is a built-in function that provides a dynamic executionCodeSo the

Reprinted -- SQL _mode, reprinted SQL _mode1. MySQL is inexplicably changed to Strict SQL Mode Recently, some database writes failed in the test group. The app layer prompts that the data is successfully inserted, but no data is generated in the

Learn how to use this in JavaScript and how to use javascript. Tip First of all, I know this article is boring. It is nothing more than this in js, and thousands of articles have already written this Part;However, I still want to write an article

Ten new features of jQuery 3.0 and new features of jquery3.0 JQuery 3.0 has released a new version. Since October 2014, the jQuery team began to maintain this major version, and the web developer community has been waiting for this moment. In June 20