diff --git a/js/config.js b/js/config.js
index 19eaff17eb5a..c55cbc66f547 100644
--- a/js/config.js
+++ b/js/config.js
@@ -122,9 +122,8 @@ function setFieldValue (field, field_type, value) {
         var options = $field.prop('options');
         var i;
         var imax = options.length;
-        var i, imax = options.length;
         for (i = 0; i < imax; i++) {
-            options[i].selected = (value.indexOf(options[i].value) != -1);
+            options[i].selected = (value.indexOf(options[i].value) !== -1);
         }
         break;
     }
diff --git a/js/db_multi_table_query.js b/js/db_multi_table_query.js
index 86d096b3902c..191bdec93db9 100644
--- a/js/db_multi_table_query.js
+++ b/js/db_multi_table_query.js
@@ -73,7 +73,7 @@ AJAX.registerOnload('db_multi_table_query.js', function () {
         }
 
         query = 'SELECT ';
-        if (columns[0][1] == '*') {
+        if (columns[0][1] === '*') {
             query += '`' + escapeBacktick(columns[0][0]) + '`.' + escapeBacktick(columns[0][1]) + '';
         } else {
             query += '`' + escapeBacktick(columns[0][0]) + '`.`' + escapeBacktick(columns[0][1]) + '`';
@@ -82,7 +82,7 @@ AJAX.registerOnload('db_multi_table_query.js', function () {
             query += ' AS ' + columns[0][2];
         }
         for (var i = 1; i < columns.length; i++) {
-            if (columns[i][1] == '*') {
+            if (columns[i][1] === '*') {
                 query += ', `' + escapeBacktick(columns[i][0]) + '`.' + escapeBacktick(columns[i][1]) + '';
             } else {
                 query += ', `' + escapeBacktick(columns[i][0]) + '`.`' + escapeBacktick(columns[i][1]) + '`';
diff --git a/js/multi_column_sort.js b/js/multi_column_sort.js
index 88b3807cca63..cc9b92150fb2 100644
--- a/js/multi_column_sort.js
+++ b/js/multi_column_sort.js
@@ -58,7 +58,7 @@ function removeColumnFromMultiSort (target, parent) {
 AJAX.registerOnload('keyhandler.js', function () {
     $('th.draggable.column_heading.pointer.marker a').on('click', function (event) {
         var url = $(this).parent().find('input').val();
-        var argsep = PMA_commonParams.get('arg_separator')
+        var argsep = PMA_commonParams.get('arg_separator');
         if (event.ctrlKey || event.altKey) {
             event.preventDefault();
             var params = removeColumnFromMultiSort(url, $(this).parent());