# operator

var a = 10, b = 20;

// Add-up operations
console.log(30 === a + b);
// Subtraction operations
console.log(-10 === a - b);
// Multiplying
console.log(200 === a * b);
// The division operation
console.log(0.5 === a / b);
// Savings calculation
console.log(10 === a % b);

var a = '.w' , b = 'xs';

// Character string concatenation
console.log('.wxs' === a + b);

var a = 10, b = 20;

// Incremental calculation
console.log(10 === a++);
console.log(12 === ++a);
// Subtraction operations
console.log(12 === a--);
console.log(10 === --a);
// Positive timing calculation
console.log(10 === +a);
// Negative Numerical Operations
console.log(0-10 === -a);
// No calculation
console.log(-11 === ~a);
// Reverse operations
console.log(false === !a);
// Delete operation
console.log(true === delete a.fake);
// Void operation
console.log(undefined === void a);
// Typeof operation
console.log("number" === typeof a);

var a = 10, b = 20;

// The left-shifting operation
console.log(80 === (a << 3));
// Right-shifting operations with symbols
console.log(2 === (a >> 2));
// No symbol right-shift operation
console.log(2 === (a >>> 2));
// And Computing
console.log(2 === (a & 3));
// Variants or operations
console.log(9 === (a ^ 3));
// Or arithmetic
console.log(11 === (a | 3));

var a = 10, b = 20;

// Less than
console.log(true === (a < b));
// greater than
console.log(false === (a > b));
// Less than equals
console.log(true === (a <= b));
// More than equals
console.log(false === (a >= b));

var a = 10, b = 20;

// Equal sign
console.log(false === (a == b));
// Non-equivalent number
console.log(true === (a != b));
// Full Equator
console.log(false === (a === b));
// Incomplete equality 
console.log(true === (a !== b));

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);

var a = 10, b = 20;

// Logic and Reason
console.log(20 === (a && b));
// Logic or
console.log(10 === (a || b));

var a = 10, b = 20;

//条件运算符
console.log(20 === (a >= 10 ? a + 10 : b + 10));
//逗号运算符
console.log(20 === (a, b));