diff --git a/src/utils/calUnitTools.js b/src/utils/calUnitTools.js
new file mode 100644
index 0000000..dd7f900
--- /dev/null
+++ b/src/utils/calUnitTools.js
@@ -0,0 +1,21 @@
+//体积不同单位相加
+export function addTj(valueArr, unitArr) {
+  let unit = ['pL', 'nL', 'uL', 'mL', 'L']
+
+  //计算最小单位
+  let mixIndex = unit.length - 1
+  for (let i = 0; i < unitArr.length; i++) {
+    let thisIndex = unit.indexOf(unitArr[i])
+    mixIndex = thisIndex < mixIndex ? thisIndex : mixIndex
+  }
+
+  let total = 0
+  for (let i = 0; i < unitArr.length; i++) {
+    let thisIndex = unit.indexOf(unitArr[i])
+    total += parseFloat(valueArr[i]) * Math.pow(1000, thisIndex - mixIndex)
+  }
+  return {
+    total: total,
+    unit: unit[mixIndex]
+  }
+}