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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | 7x 7x | export const roundToFirst = (num) => { if (num >= 1) { const power = Math.pow(10, String(Math.round(num)).length - 1); return Math.round(num / power) * power; } else if (num > 0) return +num.toFixed(String(num).match(/^0\.0*/)[0].length - 1); else // 不解决0或负数 return num; }; export const getFixedCount = (num) => { const m = String(num).match(/\.\d+/); return m ? m[0].length - 1 : 0; }; |