diff --git a/lib/util.js b/lib/util.js
index 9babde0a..11a393e9 100644
--- a/lib/util.js
+++ b/lib/util.js
@@ -488,22 +488,23 @@
         
         /**
          * function replase pFrom to pTo in pStr
-         * @pStr
-         * @pFrom
-         * @pTo
-         * @pNotEscape
+         * @param str
+         * @param from
+         * @param to
+         * @param notEscape
          */
-        this.replaceStr             = function(pStr, pFrom, pTo, pNotEscape) {
-            var ret = pStr;
+        this.replaceStr             = function(str, from, to, notEscape) {
+            var isStr   = Util.isStr(str),
+                regExp  = new RegExp(from, 'g');
             
-            if (pStr && pFrom) {
-                if (!pNotEscape)
-                    pFrom = Util.escapeRegExp(pFrom);
+            if (isStr && from) {
+                if (!notEscape)
+                    from = Util.escapeRegExp(from);
                 
-                ret = pStr.replace(new RegExp(pFrom, 'g'), pTo);
+                str = str.replace(regExp, to);
             }
            
-           return ret;
+           return str;
         };
         
         /**