0860.柠檬水找零.md

problems/0860.柠檬水找零.md

@@ -184,7 +184,41 @@ class Solution:
 Go：
 
 
+Javascript:
+```Javascript
+var lemonadeChange = function(bills) {
+    let fiveCount = 0
+    let tenCount = 0
+    let twentyCount = 0
 
+    for(let i = 0; i < bills.length; i++) {
+        let bill = bills[i]
+        if(bill === 5) {
+            fiveCount += 1
+        } else if (bill === 10) {
+            if(fiveCount > 0) {
+                fiveCount -=1
+                tenCount += 1
+            } else {
+                return false
+            }
+        } else {
+            if(tenCount > 0 && fiveCount > 0) {
+                twentyCount += 1
+                tenCount -= 1
+                fiveCount -= 1 
+            } else if(fiveCount >= 3) {
+                twentyCount += 1
+                fiveCount -= 3
+            } else {
+                return false
+            }
+        } 
+    }
+    return true
+};
+
+```
 
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 * 作者微信：[程序员Carl](https://mp.weixin.qq.com/s/b66DFkOp8OOxdZC_xLZxfw)