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36 lines
912 B
36 lines
912 B
// massUnitUtils.js
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const toGramFactor = {
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'pg': 1e-12,
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'ng': 1e-9,
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'ug': 1e-6,
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'mg': 0.001,
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'g': 1,
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'kg': 1000
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};
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const validUnits = Object.keys(toGramFactor);
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export function isMassUnit(unit) {
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if (typeof unit !== 'string') return false;
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return validUnits.includes(unit.toLowerCase());
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}
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function toGrams(value, unit) {
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if (typeof value !== 'number' || isNaN(value)) {
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throw new Error('值必须是有效数字');
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}
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const lowerUnit = unit.toLowerCase();
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if (!isMassUnit(lowerUnit)) {
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throw new Error(`无效的质量单位: ${unit}`);
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}
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return value * toGramFactor[lowerUnit];
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}
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export function compareMass(value1, unit1, value2, unit2) {
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const grams1 = toGrams(value1, unit1);
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const grams2 = toGrams(value2, unit2);
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if (grams1 > grams2) return 1;
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if (Math.abs(grams1 - grams2) < 1e-12) return 0;
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return -1;
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}
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