将数字舍入到最接近10个JavaScript的幂
我们需要编写一个带数字的JavaScript函数。该函数应返回最接近输入数字的10的幂。
例如-
f(1) = 1 f(5) = 1 f(15) = 10 f(43) = 10 f(456) = 100 f(999) = 100
示例
const num = 2355;
const num1 = 346;
const num2 = 678;
const nearestPowerOfTen = (num) => {
let count = 0;
while(num > 1){
count ++; num/= 10;
};
return Math.pow(10, count-1) * (Math.round(num) ? 10: 1);
}
console.log(nearestPowerOfTen(num));
console.log(nearestPowerOfTen(num1));
console.log(nearestPowerOfTen(num2));输出结果
控制台中的输出将是-
1000 100 1000