bc518174
 王天杨
提交两个项目文件
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export default function(x) {
return Math.abs(x = Math.round(x)) >= 1e21
? x.toLocaleString("en").replace(/,/g, "")
: x.toString(10);
}
// Computes the decimal coefficient and exponent of the specified number x with
// significant digits p, where x is positive and p is in [1, 21] or undefined.
// For example, formatDecimalParts(1.23) returns ["123", 0].
export function formatDecimalParts(x, p) {
if (!isFinite(x) || x === 0) return null; // NaN, ±Infinity, ±0
var i = (x = p ? x.toExponential(p - 1) : x.toExponential()).indexOf("e"), coefficient = x.slice(0, i);
// The string returned by toExponential either has the form \d\.\d+e[-+]\d+
// (e.g., 1.2e+3) or the form \de[-+]\d+ (e.g., 1e+3).
return [
coefficient.length > 1 ? coefficient[0] + coefficient.slice(2) : coefficient,
+x.slice(i + 1)
];
}
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