我想禁用前端wp\\U编辑器实例的输入。这可以准确跟踪字符数，但允许在达到限制后输入。

function my_char_count( $initArray ) {

  if ( ! is_admin() ) {   

    $initArray[\'setup\'] = <<<JS
[function(ed) {
    ed.on(\'keyup\', function(e) {

        var content = ed.getContent().replace(/(<[a-zA-Z\\/][^<>]*>|\\[([^\\]]+)\\])|(\\s+)/ig,\'\'); 
        var max = 20;
        var len = content.length;

        var diff = max - len; 
        if ( diff < 1 ) {
            // none of these prevents input
            ed.stopPropagation();
            ed.preventDefault();
            tinymce.dom.Event.cancel(e);
            return false;

        }    
        document.getElementById("character_count").innerHTML = "Characters Left: " + diff;    

    });

}][0]
JS;
  }

    return $initArray;
}
add_filter( \'tiny_mce_before_init\', \'my_char_count\' );