JavaScript Learning Tour (1) _ Basic knowledge

The 1th chapter is a brief history of JavaScript. Nothing to remember, the simple introduction of the origin of JS, browser conflicts and so on.

2nd Chapter JavaScript Grammar. It is noteworthy that:

(1) The string is enclosed in single or double quotes, and it is recommended that you use double quotes. (This is a good habit of programming OH)

such as: Var mood= "Happy";

(2) The character escape (escaping) with the back slash \

such as: Var mood= ' don\ ' t ask '; alert (mood); Output don ' t ask.

var height= "about 5 ' 10\" tall "; alert (height); Output about 5 ' tall '.

Single quotes in single quotes need to be in front of single quotes in a string with a backslash \

Similarly, double quotes in a string with double quotes require a backslash before the double quotes in the string

(3) Function This important, here is not much to say.

(4) Since the object is programming, leaving this is not called programming.



An object is a self-contained collection of data that can be accessed in two forms----properties and Methods (method):

Attributes are simply variables

In a simple way, it's a function.

They all belong to a particular object. They need to use the "dot" syntax to access:

Object.property

Object.Method ()



(5) Built-in object. Array objects, math objects, date objects, and so on are built-in objects of JavaScript. They offer a lot of useful ways for us to use. Built-in objects can help the outside to quickly and easily accomplish many tasks.

(6) The host object. Host exclusive includes form, image and element. We can use these objects to get information about the form images and various form elements on a given Web page.

Form, image, and element. Is rarely used, because there is also an object that can be used to obtain information about any element on a given Web page, which is a well-known document object.