nl_tokens: 设置 CodeMirror（编辑区）的主题 Setting CodeMirror ( Editor area ) theme
pl_tokens: function ( theme ) { var settings = this . settings ; settings . editorTheme = theme ; if ( theme !== "default" ) { editormd . loadCSS ( <mask> . path + "codemirror/theme/" + settings . editorTheme ) ; } this . cm . setOption ( "theme" , theme ) ; return this ; }