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/** 从带单位的文本(如「3900克」「3900g」)中提取数值部分 */
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export function extractNumericPart(val: unknown): number | null {
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if (val == null || val === '') return null
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if (typeof val === 'number') {
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return Number.isNaN(val) ? null : val
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}
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const match = String(val).trim().match(/-?\d+(?:\.\d+)?/)
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if (!match) return null
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const num = Number(match[0])
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return Number.isNaN(num) ? null : num
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}
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