What does javascript sandbox mean?

The sandbox in JavaScript refers to a completely independent area that uses its own independent properties and methods. The basic format of the sandbox in js is "(function(){})(...) "; Sandbox mode is generally used when writing third-party frameworks or writing plug-ins for third-party frameworks or writing components with independent functions.

The operating environment of this article: windows7 system, javascript version 1.8.5, DELL G3 computer

What does javascript sandbox mean?

The concept of sandbox in js

Sandbox

The sandbox is a completely independent area in js that uses Independent properties and methods

Basic format of sandbox in js

(function(){})()

Self-calling function (immediate execution of function)

Sandbox usage specifications

Write all variable definitions at the top

Place logic code in the middle

Finally, if necessary, expose some members to the outside world (such as jQuery, such as window. For example, window .=window.jQuery=$)

The purpose of sandbox

Sandbox mode is generally used when writing third-party frameworks

or for third parties Framework writing plug-in

or writing some components with independent functions

Advantages of sandbox mode

1. Sandbox mode uses IIFE, not Any global variables will be exposed to the outside world, which will not cause global variable pollution

2. All data in the sandbox is completely isolated from the outside world and cannot be modified by the outside world, which ensures To ensure the security of the code

Recommended study: "javascript basic tutorial"

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