Fix syntax like arr[0] < num highlight error

Author: yuezk

after/syntax/javascript.vim

@@ -45,7 +45,7 @@ syntax region jsxTag
 " s~~~~e
 " A big start regexp borrowed from https://git.io/vDyxc
 syntax region jsxRegion
-      \ start=+\(\((\|{\|}\|\[\|\]\|,\|&&\|||\|?\|:\|=\|=>\|\Wreturn\|^return\|\Wdefault\|^\|>\)\_s*\)\@<=<\_s*\z([_\$a-zA-Z]\(\.\?[\$0-9a-zA-Z]\+\)*\)+
+      \ start=+\(\((\|{\|}\|\[\|,\|&&\|||\|?\|:\|=\|=>\|\Wreturn\|^return\|\Wdefault\|^\|>\)\_s*\)\@<=<\_s*\z([_\$a-zA-Z]\(\.\?[\$0-9a-zA-Z]\+\)*\)+
       \ skip=+<!--\_.\{-}-->+
       \ end=+</\_s*\z1>+
       \ end=+/>+

sample.js

@@ -16,6 +16,7 @@ class App extends Component {
     var c = a<foo
     var d = a<foo
     var e = a>c
+    var bar = arr[1] < foo;
 
     if (a<b && a<d || a>c){
       return <a></a>