style(js): fix code style in JS

Author: cotes2020

_javascript/utils/locale-datetime.js

@@ -6,7 +6,7 @@
 
 /* A tool for locale datetime */
 const LocaleHelper = (function () {
-  const locale = $('html').attr('lang').substr(0, 2)
+  const locale = $('html').attr('lang').substr(0, 2);
   const attrTimestamp = 'data-ts';
   const attrDateFormat = 'data-df';
 

_javascript/utils/smooth-scroll.js

@@ -28,7 +28,7 @@ $(function() {
       const hash = decodeURI(this.hash);
       let toFootnoteRef = RegExp(/^#fnref:/).test(hash);
       let toFootnote = toFootnoteRef ? false : RegExp(/^#fn:/).test(hash);
-      let selector = hash.includes(":") ? hash.replace(/\:/g, "\\:") : hash;
+      let selector = hash.includes(":") ? hash.replace(/:/g, "\\:") : hash;
       let $target = $(selector);
 
       let isMobileViews = $topbarTitle.is(":visible");