JS Learning 20150318

Type Prefix type instance
Objects O Object Odiv
Arrays a array Aitems
String S-String sUserName
Integer I integer iitemcount
Boolean B boolean Biscomplete
Floating point F float fprice
FUNCTIONS fn function Fnhandler
Regular expression re RegExp Reemailcheck
Variant variable v variant vanything

Modulo% integer to seek "remainder"
10%3 1

If False in the case:
false,0, "", null, Undefined, NaN


Options tab

typeof

Undefined:2 type of situation:
1, there really is no definition
2. No assignment is defined

Null: Represents an empty object, but an empty object is also an object. So typeof null--"Object
Null: Yes, but it's empty.
Undefined: didn't give anything


parseint ()
Principle: Scans the entire string from left to right, and returns if it encounters a number that is not. If the first is not a number, then it will be an error.

Number (parameter)
Arguments cannot have something that is not a number, if any--"NaN


Get non-inline styles
Advanced Browser
getComputedStyle ("manipulated element", false). Property name of the style
Low-level browser ie8-
The element of the action. Cuurentstyle. Style Property Name
Cannot manipulate compound styles
JS inside operation style all have hump mark



Operator:
1. Arithmetic operators
2. Comparison operators
3. Assignment operators
4. Logical operators
Precedence of operators: Best brackets ()!!!
Common priority:
Assignment "logic" comparison "arithmetic

True 1 false 0 null 0


Math.random () [0, 1)
Random number of N to M [N, M]
Math.random () * (m-n) + N

JS Learning 20150318