如何返回总共12位数的值？

Question

如何格式化导致总共12位数的数字？

12.123 should result 12.1230000000
1234567890.12345 should result 1234567890.12
12 should result 12.0000000000

Answer 1

Number.prototype.toPrecision()

Fiddle Demo

function FormatMeTo12Digits(num) {
    return num.toPrecision(12);
}

FormatMeTo12Digits(12.345);