fix(Select): AutoComplete input focus selectionStart close #1913 (#1921)

Author: frankqian

src/input/base.jsx

@@ -294,10 +294,10 @@ class Base extends React.Component {
 
     focus(start, end) {
         this.inputRef.focus();
-        if (typeof start !== 'undefined') {
+        if (typeof start === 'number') {
             this.inputRef.selectionStart = start;
         }
-        if (typeof end !== 'undefined') {
+        if (typeof end === 'number') {
             this.inputRef.selectionEnd = end;
         }
     }

src/select/base.jsx

@@ -561,12 +561,12 @@ export default class Base extends React.Component {
      * 点击 arrow 或 label 的时候焦点切到 input 中
      * @override
      */
-    focusInput(...args) {
-        this.inputRef.focus(...args);
+    focusInput() {
+        this.inputRef.focus();
     }
 
     focus(...args) {
-        this.focusInput(...args);
+        this.inputRef.focus(...args);
     }
 
     beforeOpen() {