運算子(Operators)

• 算數運算子(Arithmetic Operators)
• 指派運算子(Assignment Operators)
• 比較運算子(Comparison Operators)
• 邏輯運算子(Logical Operators)
• 型態運算子(Type Operators)
• 位元運算子(Bitwise Operators)

算數運算子(Arithmetic Operators)

1. +: addition(可用於數字相加，數字+字串，字串+字串) >> console.log(10+10);
   
2. -: subtraction >> console.log(10 - 1);
3. *: multiplication >> console.log("5"*2);
4. /: division >> console.log(10/3);
5. %: modulus(remainder) >> console.log(10%3);
6. ++: increment >>
   
   印出x++表示印x，++在後面，印出++x表示先計算加1再印出x。
7. --: decrement 與++用法相同，只不過是減1。
8. **: power >> console.log(3**5);

指派運算子(Assignment Operators)

1. = : >> x = 5
2. +=: >> x += 5
3. -=: >> x -= 5
4. *=: >> x *= 5
5. /=: >> x /= 5
6. %=: >> x %= 5

比較運算子(Comparison Operators)

1. ==: equal to(only value) >> "5" == 5 (true)
2. ===: equal value and equal type
3. !=: not equal >> "5" != 5 (false)
4. !==: not equal value or not equal type
5. >: greater than
6. <: less than
7. >=: greater than or equal to
8. <=: less than or equal to
9. ?: ternary operator >> 10 > 5 ? "Yes": "No"

邏輯運算子(Logical Operators)

1. &&: logical and
2. ||: logical or
3. ! : logical not

型態運算子(Type Operators)

1. typeof: returns the type of a variable
2. instanceof: returns true if an object is an instance of an object type

位元運算子(Bitwise Operators)

1. &: and >> 0101 & 0100
2. |: or >> 5|2
3. ~: not >> ~5
4. ^: xor >> 1^5
5. <<: zero fill left shift >> 10 << 2 (*4)
6. >>: signed right shift >> 10 >> 1 (/2)
7. >>> zero fill right shift >> 10 >>> 1