perf(jqLite): improve performance of jqLite#text

This change is not compatible with IE8.

Author: IgorMinar

src/jqLite.js

@@ -591,23 +591,15 @@ forEach({
   },
 
   text: (function() {
-    var NODE_TYPE_TEXT_PROPERTY = [];
-    if (msie < 9) {
-      NODE_TYPE_TEXT_PROPERTY[1] = 'innerText';    /** Element **/
-      NODE_TYPE_TEXT_PROPERTY[3] = 'nodeValue';    /** Text **/
-    } else {
-      NODE_TYPE_TEXT_PROPERTY[1] =                 /** Element **/
-      NODE_TYPE_TEXT_PROPERTY[3] = 'textContent';  /** Text **/
-    }
     getText.$dv = '';
     return getText;
 
     function getText(element, value) {
-      var textProp = NODE_TYPE_TEXT_PROPERTY[element.nodeType];
       if (isUndefined(value)) {
-        return textProp ? element[textProp] : '';
+        var nodeType = element.nodeType;
+        return (nodeType === 1 || nodeType === 3) ? element.textContent : '';
       }
-      element[textProp] = value;
+      element.textContent = value;
     }
   })(),