strict mode

has been to the this point is very vague, find some other people's blog look, and re-read the "You do not know the JavaScript", the feeling is basically to understand, pick some of the key points of the record, some places for me to explain the book

1. Floating-point numbers generate errors during operation because the computer cannot accurately represent infinite loop decimals.To compare two floating-point numbers for equality, you can only calculate the absolute value of their difference to

Block-level scopes ES5 does not have block-level scope, only global scope and function scope, because of this, the scope of the variable is very wide, so a entry function is to create it immediately. This creates the so-called variable ascension.

Tip First of all, I know this article is very boring, nothing more than the this in JS, and there have been thousands of articles have written this part of the content;However, I still want to write a about JS in this article, is a summary summed

JQuery 3.0 has released its final new version recently. Since October 2014, the jquery team has started to maintain this major release, and the web developer community has been looking forward to this moment, and finally in June 2016 they have come

An error occurred while inserting a set of data into the MySQL database! The database is relentless. Error: Error 1365 (22012): division by 0; meaning: You cannot insert the result of an operation with a divisor of 0 in the previous database. So go

I. OverviewUnlike other databases, MySQL can run different SQL model, SQL model defines the SQL syntax supported by the MySQL application, data validation, etc., which makes it easier to use MySQL in different environments.SQL model is commonly used

In this article, the author tells about the delete error in the book "JavaScript Object-Oriented Programming Guide" and details the implementation of the delete operation, limitations and performance in different browsers and plug-ins (firebug here).

This article mainly introduces some notable new features of PHP 7. These new features are described in detail in the new document. For more information, see This article mainly introduces some notable new features of PHP 7. These new features are

PHP7 will be officially released in October 2015. PHP7 will be a major version update for the PHP script language. It will also bring about significant performance improvements and new features, as well as some outdated features. This version will

So far, PHP has officially released the RC5 version of PHP7, which is expected to release the first official version around November! For now, PHP7 's major features are definitely in shape and there will be no more changes. Some of the iterations

In this article, the author tells about the delete error in the book "JavaScript Object-Oriented Programming Guide" and details the implementation of the delete operation, limitations and performance in different browsers and plug-ins (firebug here.

1. Recognition of Objects (1) object attributes and features What is Property and Attribute? What is the difference? I don't want to distinguish it from semantics. For this series of articles, attributes constitute a part of the object and also

PHP7 will be officially released in October 2015. PHP7 will be a major version update for the PHP script language. It will also bring about significant performance improvements and new features, as well as some outdated features. This release will

This article mainly introduces some notable new features of PHP 7. these new features are described in detail in the new document. For more information, see 1 .?? Operator (NULL merge operator)Put this in the first example because I think it is

This article mainly introduces the new features introduced in PHP 7.0, the need for friends can refer to the following ?? Operator (NULL merge operator) put this on the first one because I think it's useful. Usage: $a = $_get[' A ']?? 1; It is

Recently, I took over a running project and encountered a problem when pulling it to the local machine for running. When I inserted the database, the error Incorrect integer value: "for column 'id' at row 1 was reported.Literally, the auto-increment

In JavaScript, the function's this keyword behaves a lot differently than other languages. There is also a slight difference between the strict and non-strict modes of JavaScript.In most cases, the way the function is called determines the value of

Delete the key and javascriptobject in the middle of a Javascript Object This is not the case either. Go back to farming and you will Copy codeThe Code is as follows:Delete thisIsObject [key]OrDelete thisIsObject. key By the way, let's talk about

In this article, the author tells about the delete error in the book "JavaScript Object-Oriented Programming Guide" and details the implementation of the delete operation, limitations and performance in different browsers and plug-ins (firebug here.