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82 lines
2.2 KiB
82 lines
2.2 KiB
//体积不同单位相加
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export function addTj(valueArr, unitArr) {
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let unit = ['pL', 'nL', 'uL', 'mL', 'L']
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//计算最小单位
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let mixIndex = unit.length - 1
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for (let i = 0; i < unitArr.length; i++) {
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let thisIndex = unit.indexOf(unitArr[i])
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mixIndex = thisIndex < mixIndex ? thisIndex : mixIndex
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}
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let total = 0
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for (let i = 0; i < unitArr.length; i++) {
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let thisIndex = unit.indexOf(unitArr[i])
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total = addDecimals(
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total,
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multiplyDecimals(
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parseFloat(valueArr[i]),
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Math.pow(1000, thisIndex - mixIndex)
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)
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)
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// total += parseFloat(valueArr[i]) * Math.pow(1000, thisIndex - mixIndex)
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}
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return {
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total: total,
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unit: unit[mixIndex]
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}
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}
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export function addDecimals(a, b) {
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if (Number.isNaN(a) || Number.isNaN(b)) {
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return 0
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}
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const strA = a.toString()
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const strB = b.toString()
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// 获取小数位数
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const getDecimals = (str) => (str.split('.')[1] || '').length
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const maxLen = Math.max(getDecimals(strA), getDecimals(strB))
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// 相加并格式化为字符串
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const result = (parseFloat(a) + parseFloat(b)).toFixed(maxLen)
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// 去掉末尾的0
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return result.replace(/(\.\d*?)0+$/, '$1').replace(/\.$/, '')
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}
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export function multiplyDecimals(a, b) {
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if (Number.isNaN(a) || Number.isNaN(b)) {
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return 0
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}
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const strA = a.toString()
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const strB = b.toString()
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const decA = (strA.split('.')[1] || '').length
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const decB = (strB.split('.')[1] || '').length
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const totalDecimals = decA + decB
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const numA = BigInt(strA.replace('.', ''))
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const numB = BigInt(strB.replace('.', ''))
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const product = numA * numB
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const productStr = product.toString()
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const isNegative = productStr.startsWith('-')
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const absStr = isNegative ? productStr.substring(1) : productStr
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let result = ''
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if (totalDecimals === 0) {
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result = absStr
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} else if (absStr.length <= totalDecimals) {
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result = '0.' + absStr.padStart(totalDecimals, '0')
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} else {
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result =
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absStr.substring(0, absStr.length - totalDecimals) +
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'.' +
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absStr.substring(absStr.length - totalDecimals)
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}
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result = result.replace(/\.?0+$/, '') || '0'
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return (isNegative ? '-' : '') + result
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}
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