style(js): standard

scripts/link.js

@@ -7,8 +7,6 @@
 * to remove title attribute and 'external' option
 */
 
-'use strict'
-
 const { htmlTag } = require('hexo-util')
 
 function linkHelper (path, text) {

scripts/listTags.js

@@ -8,8 +8,6 @@
 * http://microformats.org/wiki/rel-tag
 */
 
-'use strict'
-
 function listTagsHelper (tags, options) {
   if (!options && (!tags || !Object.prototype.hasOwnProperty.call(tags, 'length'))) {
     options = tags

scripts/meta_generator.js

@@ -1,4 +1,5 @@
 'use strict'
+/* global hexo */
 
 function metaGeneratorHelper () {
   return '<meta name="generator" content="Hexo %s">'.replace('%s', this.env.version)