diff --git a/src/helpers/common.js b/src/helpers/common.js
new file mode 100644
index 0000000..42259a0
--- /dev/null
+++ b/src/helpers/common.js
@@ -0,0 +1,10 @@
+export function trim (str) {
+  if (!str) return str
+  return str.replace(/^\s+|\s+$/g, '')
+}
+
+
+export function toCommaList (arr, key = 'name') {
+  if (!arr) return
+  return arr.map(item => item[key]).join(', ')
+}