Lightning Components Developer Guide

What is the Lightning Component Framework?
Quick Start
Creating Components
Using Components
Communicating with Events
Creating Apps
App Overview
Designing App UI
Creating App Templates
Developing Secure Code
What is LockerService?
JavaScript ES5 Strict Mode Enforcement
DOM Access Containment
Secure Wrappers for Global References
Access to Supported JavaScript API Framework Methods Only
What Does LockerService Affect?
Disabling LockerService for a Component
Don’t Mix Component API Versions
LockerService Disabled for Unsupported Browsers
Content Security Policy Overview
Validations for Lightning Component Code
Styling Apps
Using JavaScript
JavaScript Cookbook
Using Apex
Lightning Data Service
Lightning Container
Controlling Access
Using Object-Oriented Development
Using the AppCache
Distributing Applications and Components
Debugging
Fixing Performance Warnings
Reference
PDF

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What is LockerService?

LockerService is a powerful security architecture for Lightning components. LockerService enhances security by isolating Lightning components in their own namespace. LockerService also promotes best practices that improve the supportability of your code by only allowing access to supported APIs and eliminating access to non-published framework internals.