Third day JavaScript operator (cont.)

1, post increment/decrement operator ++,--

such as: Var i=0;

var a=i++;

Console.log (a);

2 . Comparison operator (<, >=, <=, = =,!=,===,!==)

Alert (> 5); Outputs True

var i = 100;

var n = 100;

alert (i = = n); Outputs true;

Alert (i! = n); Outputs false;

alert (i = = N)//data type, value equal

3, logical operators (&&, | |,!)

&&: Logic and

|| : Logical OR

！ : Logical Non-

var i = 8;

Alert (i<5 && i<10); Outputs false

Alert (i > | | i < 10); Outputs True

Alert (! (    > 5)); Outputs false

Second, the program flow control

1. Conditional Statement if

Grammar:

if (condition) Statements1 else statement2

Cases:

if (> 5) {

Alert ("Hello World");

}

var i = 90;

if (i > 100) {

Alert (i + "greater than 100");

}else if (i > 80) {

Alert (i + "greater than 80");

}else{

Alert (i + "less than 100");

}

2.switch Statement

Grammar:

switch (expression) {

Case Value:

Statement

Break

Case Value:

Statement

Break

Default

Statement

}

Cases:

var i = 25;

switch (i) {

Case 25:

Alert (i + "equals 25");

Break

Case 100:

alert (100);

Break

Default

Alert (' other ');

}

Third day JavaScript operator (cont.)