Pull request #3520: BI-125622 fix(core/func/alias): substring 当 substr 用了

Merge in VISUAL/fineui from ~XAVIER.MENG/fineui:es6 to es6

* commit '0b2defd662bafadc13bc48779c43a4898f4ab3ef':
  BI-125622 fix(core/func/alias): substring 当 substr 用了

packages/fineui/src/core/func/alias.js

@@ -337,7 +337,7 @@ function _dealWithLeft(tleft, fleft) {
             newstr = "";
             let n = res.length - 1 - combo;
             for (; n >= 0; n = n - combo) {
-                newstr = `${res.substring(n, combo)},${newstr}`;
+                newstr = `${res.substring(n, n + combo)},${newstr}`;
             }
             const lres = res.substring(0, n + combo);
             if (!isEmpty(lres)) {