Front-end basic-javascript third day

Arrays Array declaring an array

Working with Arrays

method used : array name [ index value ]; the name of the function ();

The index number starts at 0. 0 1 2 3 4 5 ...

The length of the array

array name . length;

Iterating through an array

think of the for traversal array

Characters connected

+

Add Value characters Connected

The value that all input takes is the character type.

Ternary operatorsThree mesh operator

One dollar: a++ b++ +a-a

two USD : A+b a>=b

ternary : an expression? Results 1: Results 2 equivalent to if Else

If an expression result is true , The return Results 1

If the result of an expression is false, returns the result 2

if (3>5) {alert ("one")} else {alert (22)} = =

3>5? Alert (one): Alert (22)

Exclusive ideas

Exclusive thought :

First, kill everyone . left me alone .

Front-end basic-javascript third day