运算符优先级值
括号中的表达式在表达式的其余部分之前计算,函数在结果用于表达式的其余部分之前执行:
优先级 | 运算符 | 描述 | 例子 |
---|---|---|---|
18 | ( ) | 表达式分组 | (100 + 50) * 3 |
17 | . | 属于成员 | person.name |
17 | [] | 属于成员 | person[“name”] |
17 | ?. | 可选链 ES2020 | x ?. y |
17 | () | 函数调用 | myFunction() |
17 | new | 带参的新建 | new Date(“June 5,2022”) |
16 | new | 不带参的新建 | new Date() |
增量运算符后缀递增在前缀递增之前执行。 |
|||
15 | ++ | 后缀递增 | i++ |
15 | — | 后缀递减 | i– |
14 | ++ | 前缀递增 | ++i |
14 | — | 前缀递减 | –i |
NOT 运算符 |
|||
14 | ! | 逻辑非 | !(x==y) |
14 | ~ | 按位非 | ~x |
一元运算符 |
|||
14 | + | 一元加 | +x |
14 | – | 一元减 | -x |
14 | typeof | 数据类型 | typeof x |
14 | void | 评估空 | void(0) |
14 | delete | 属性删除 | delete myCar.color |
算术运算符指数运算在乘法之前执行。 乘法和除法在加法和减法之前执行。 |
|||
13 | ** | 指数运算 ES2016 | 10 ** 2 |
12 | * | 乘 | 10 * 5 |
12 | / | 除 | 10 / 5 |
12 | % | 除法余数 | 10 % 5 |
11 | + | 加 | 10 + 5 |
11 | – | 减 | 10 – 5 |
11 | + | 串联 | “Bill” + “Gates” |
移位运算符 |
|||
10 | << | 左移 | x << 2 |
10 | >> | 右移(带符号) | x >> 2 |
10 | >>> | 右移(无符号) | x >>> 2 |
关系运算符 |
|||
9 | in | 对象中的属性 | “PI” in Math |
9 | instanceof | 对象的实例 | x instanceof Array |
比较运算符 |
|||
9 | < | 小于 | x < y |
9 | <= | 小于或等于 | x <= y |
9 | > | 大于 | x > y |
9 | >= | 大于或等于 | x >= Array |
8 | == | 等于 | x == y |
8 | === | 严格相等 | x === y |
8 | != | 不相等 | x != y |
8 | !== | 严格不相等 | x !== y |
位运算符 |
|||
7 | & | 按位与 | x & y |
6 | ^ | 按位异或 | x ^ y |
5 | | | 按位或 | x | y |
逻辑运算符 |
|||
4 | && | 逻辑与 | x && y |
3 | || | 逻辑或 | x || y |
3 | ?? | 空值合并 ES2020 | x ?? y |
条件(三元)运算符 |
|||
2 | ? : | 条件 | ? “yes” : “no” |
赋值运算符赋值在其他操作之后执行。 |
|||
2 | = | 简单赋值 | x = y |
2 | : | 冒号赋值 | x: 5 |
2 | += | 加法赋值 | x += y |
2 | -= | 减法赋值 | x -= y |
2 | *= | 乘法赋值 | x *= y |
2 | **= | 指数赋值 | x **= y |
2 | /= | 除法赋值 | x /= y |
2 | %= | 取余赋值 | x %= y |
2 | <<= | 左移赋值 | x <<= y |
2 | >>= | 右移赋值 | x >>= y |
2 | >>>= | 无符号右移 | x >>>= y |
2 | &= | 位与赋值 | x &= y |
2 | |= | 位或赋值 | x |= y |
2 | ^= | 位异或赋值 | x ^= y |
2 | &&= | 逻辑与赋值 | x &= y |
2 | ||= | 逻辑或赋值 | x ||= y |
2 | => | 箭头 | x => y |
2 | yield | 暂停 / 恢复 | yield x |
2 | yield* | 委托运算符 | yield* x |
2 | … | 展开运算符 | … x |
1 | , | 逗号 | x , y |
以下是英文运算符优先级
Precedence | Associativity | Individual operators | Notes |
---|---|---|---|
18: grouping | n/a | Grouping (x) |
[1] |
17: access and call | left-to-right | Member access x.y |
[2] |
Optional chaining x?.y |
|||
n/a | Computed member access x[y] |
[3] | |
new with argument list new x(y) |
[4] | ||
Function call x(y) |
|||
import(x) | |||
16: new | n/a | new without argument list new x |
|
15: postfix operators | n/a | Postfix increment x++ |
[5] |
Postfix decrement x– |
|||
14: prefix operators | n/a | Prefix increment ++x |
[6] |
Prefix decrement –x |
|||
Logical NOT !x |
|||
Bitwise NOT ~x |
|||
Unary plus +x |
|||
Unary negation -x |
|||
typeof x | |||
void x | |||
delete x | [7] | ||
await x | |||
13: exponentiation | right-to-left | Exponentiation x ** y |
[8] |
12: multiplicative operators | left-to-right | Multiplication x * y |
|
Division x / y |
|||
Remainder x % y |
|||
11: additive operators | left-to-right | Addition x + y |
|
Subtraction x – y |
|||
10: bitwise shift | left-to-right | Left shift x << y |
|
Right shift x >> y |
|||
Unsigned right shift x >>> y |
|||
9: relational operators | left-to-right | Less than x < y |
|
Less than or equal x <= y |
|||
Greater than x > y |
|||
Greater than or equal x >= y |
|||
x in y | |||
x instanceof y | |||
8: equality operators | left-to-right | Equality x == y |
|
Inequality x != y |
|||
Strict equality x === y |
|||
Strict inequality x !== y |
|||
7: bitwise AND | left-to-right | Bitwise AND x & y |
|
6: bitwise XOR | left-to-right | Bitwise XOR x ^ y |
|
5: bitwise OR | left-to-right | Bitwise OR x | y |
|
4: logical AND | left-to-right | Logical AND x && y |
|
3: logical OR, nullish coalescing | left-to-right | Logical OR x || y |
|
Nullish coalescing operator x ?? y |
[9] | ||
2: assignment and miscellaneous | right-to-left | Assignment x = y |
[10] |
Addition assignment x += y |
|||
Subtraction assignment x -= y |
|||
Exponentiation assignment x **= y |
|||
Multiplication assignment x *= y |
|||
Division assignment x /= y |
|||
Remainder assignment x %= y |
|||
Left shift assignment x <<= y |
|||
Right shift assignment x >>= y |
|||
Unsigned right shift assignment x >>>= y |
|||
Bitwise AND assignment x &= y |
|||
Bitwise XOR assignment x ^= y |
|||
Bitwise OR assignment x |= y |
|||
Logical AND assignment x &&= y |
|||
Logical OR assignment x ||= y |
|||
Nullish coalescing assignment x ??= y |
|||
right-to-left | Conditional (ternary) operator x ? y : z |
[11] | |
right-to-left | Arrow x => y |
[12] | |
n/a | yield x | ||
yield* x | |||
Spread …x |
[13] | ||
1: comma | left-to-right | Comma operator x, y |
除教程外,本网站大部分文章来自互联网,如果有内容冒犯到你,请联系我们删除!