"JavaScript Object-oriented essentials"
The reason to buy this book is mainly because the author, Nicholas C. Zakas Bull x Brilliant JS experts, read the JS elevation should know him, and this book is his latest masterpiece, feel is also the essence of JS elevation version, full of posture, but this book is not suitable for beginners, read the best to understand JS.
Chapter One primitive type and reference type
The original type is still the cliché of the 5: boolean,number,string,null,undefined.
But I always do not think typeof null as object should not be serious to treat as a mistake, after all, NULL is an empty object, NULL is a heap, undefined is not very conflict.
Interesting access properties:
In JS, you can specify the properties you want to access by using the form of a custom variable:
"JavaScript Object-oriented essentials" reading notes