The JavaScript authoritative guide reading notes

This is a very long blog

Finally the authoritative guide to buy back, has been hesitant, first: The book is too thick, afraid to buy can not insist on reading. Second: Feel too expensive, at least 100 ￥. Now the internship can also pay a little salary, set a volunteer for themselves: the one-month salary for the purchase of books. It's not too much of an expense to buy a 100￥ book. Good! Buy! In order to insist on reading, I will send reading notes to the blog, to urge themselves, but also to deepen their impressions, one at a stroke N, so decided.

Start reading:

1.

JS "False value": false, Undefined,null,0,-0,nan, "" (empty string) Total 7 All the remaining values are all true.

When JS expects to use a Boolean value, it treats the Undefined,null,0,-0,nan, "" as false.

2.

When the browser initializes, the initial properties of the global object are:

Global properties: Undefined, Infinity,nan

Global functions: IsNaN (), parseint (), eval ()

Constructor: Date (), RegExp (), String (), Object (), Array ()

Global objects: Math, JSON

3.

= = will turn Undefined,null,0,-0,nan, "" and convert to False

= = Treats the string, number, and Boolean primitive values as equal to their wrapper classes (objects). = = = as unequal

The JavaScript authoritative guide reading notes