1. Operators
Operators are symbols used to implement assignments, comparisons, and perform arithmetic functions.
- Arithmetic operators: + - * / %
- Increment and decrement operators ++, --
- Comparison operators: >, <, >=, <=, ==, !=, === (all equal to)
- Logical operators: &&, ||, !
- Assignment operators: =, +=, -=, %=, *=
1. Arithmetic operators
There is a precision problem in floating-point calculation, which is a problem at the bottom of the computer. So don't judge if two floats are equal
2. Increment and decrement operators
It is divided into pre-increment and post-increment, and it is the same when used alone
Pre-increment first self-increment before assignment, post-increment first assignment and then increment. Pay attention to the priority order of expression operations
var p = 10
console.log(++p + 10)//return 21
console.log(p++ + 10)//return 20
3. Comparison operators
== There is a default conversion data type, which will convert string type data to digital type
console.log('18'==18) //true
console.log('18'===18) //false
4. Logical operators
It seems nothing special
5. Assignment operator
nothing special
6. Operator precedence
Logical AND > Logical OR
