console.log('二进制',0B111110111);
console.log('八进制',0767);
console.log('15',Number.isFinite(15));
console.log('NaN',Number.isFinite(NaN));
console.log('1/0',Number.isFinite('true'/0));
console.log('NaN',Number.isNaN(NaN));
console.log('10',Number.isInteger(10));
console.log('10.0',Number.isInteger(10.0));
console.log('10.1',Number.isInteger(10.1));
console.log('10.1',Number.isInteger('10'));
console.log(Number.MAX_SAFE_INTEGER,Number.MIN_SAFE_INTEGER);
console.log('10.0',Number.isSafeInteger(10));
console.log('a',Number.isSafeInteger('a'));
console.log(4.1,Math.trunc(4.1));
console.log(4.9,Math.trunc(4.9));
console.log('-5',Math.sign(-5));
console.log('0',Math.sign(0));
console.log('5',Math.sign(5));
console.log('50',Math.sign('50'));
console.log('foo',Math.sign('foo'));
console.log('-1',Math.cbrt(-1));
console.log('8',Math.cbrt(8));
console