基本運算符

示例代碼：

var a = 10, b = 20;// 加法運算console.log(30 === a + b);// 減法運算console.log(-10 === a - b);// 乘法運算console.log(200 === a * b);// 除法運算console.log(0.5 === a / b);// 取余運算console.log(10 === a % b);

var a = '.w' , b = 'xs';// 字符串拼接console.log('.wxs' === a + b);

一元運算符

示例代碼：

var a = 10, b = 20;// 自增運算console.log(10 === a++);console.log(12 === ++a);// 自減運算console.log(12 === a--);console.log(10 === --a);// 正值運算console.log(10 === +a);// 負值運算console.log(0-10 === -a);// 否運算console.log(-11 === ~a);// 取反運算console.log(false === !a);// delete 運算console.log(true === delete a.fake);// void 運算console.log(undefined === void a);// typeof 運算console.log("number" === typeof a);

位運算符

示例代碼：

var a = 10, b = 20;// 左移運算console.log(80 === (a << 3));// 無符號右移運算console.log(2 === (a >> 2));// 帶符號右移運算console.log(2 === (a >>> 2));// 與運算console.log(2 === (a & 3));// 異或運算console.log(9 === (a ^ 3));// 或運算console.log(11 === (a | 3));

比較運算符

示例代碼：

var a = 10, b = 20;// 小于console.log(true === (a < b));// 大于console.log(false === (a > b));// 小于等于console.log(true === (a <= b));// 大于等于console.log(false === (a >= b));

等值運算符

示例代碼：

var a = 10, b = 20;// 等號console.log(false === (a == b));// 非等號console.log(true === (a != b));// 全等號console.log(false === (a === b));// 非全等號console.log(true === (a !== b));

賦值運算符

示例代碼：

var a = 10;a = 10; a *= 10;console.log(100 === a);a = 10; a /= 5;console.log(2 === a);a = 10; a %= 7;console.log(3 === a);a = 10; a += 5;console.log(15 === a);a = 10; a -= 11;console.log(-1 === a);a = 10; a <<= 10;console.log(10240 === a);a = 10; a >>= 2;console.log(2 === a);a = 10; a >>>= 2;console.log(2 === a);a = 10; a &= 3;console.log(2 === a);a = 10; a ^= 3;console.log(9 === a);a = 10; a |= 3;console.log(11 === a);

二元邏輯運算符

示例代碼：

var a = 10, b = 20;// 邏輯與console.log(20 === (a && b));// 邏輯或console.log(10 === (a || b));

其他運算符

示例代碼：

var a = 10, b = 20;//條件運算符console.log(20 === (a >= 10  a + 10 : b + 10));//逗號運算符console.log(20 === (a, b));

運算符優先級