Cache length variables.

js/tests/index.html

@@ -42,7 +42,7 @@
           'delegate',
           'undelegate'
         ]
-        for (var i = 0; i < eventAliases.length; i++) {
+        for (var i = 0, len = eventAliases.length; i < len; i++) {
           var eventAlias = eventAliases[i]
           $.fn[eventAlias] = function () {
             throw new Error('Using the ".' + eventAlias + '()" method is not allowed, so that Bootstrap can be compatible with custom jQuery builds which exclude the "event aliases" module that defines said method. See https://github.com/twbs/bootstrap/blob/master/CONTRIBUTING.md#js')
@@ -125,7 +125,7 @@
           'test',
           'throws'
         ];
-        for (var i = 0; i < methodNames.length; i++) {
+        for (var i = 0, len = methodNames.length; i < len; i++) {
           var methodName = methodNames[i];
           window[methodName] = undefined;
         }