Lichess Hide New Opponent Button

Hides 'New Opponent' Button While Rematch is Still Available
当前为 2018-04-29 提交的版本，查看最新版本。
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// ==UserScript==
// @name          Lichess Hide New Opponent Button
// @namespace     http://userstyles.org
// @description   Hides 'New Opponent' Button While Rematch is Still Available
// @author        636597
// @include       *://*lichess.org/*
// @run-at        document-start
// @version       0.1
// ==/UserScript==

var lichess_ground_class_name = "lichess_ground";
var lichess_ground_element = null;
var lichess_ground_observer = null;

var observerConfig = {
    subtree: true ,
    attributes: true,
    childList: true,
    characterData: true
};

function hideNewOpponentButton() {
    var follow_up_el = document.getElementsByClassName( "follow_up" );
    if ( follow_up_el ) {
        if ( follow_up_el[ 0 ] ) {
            follow_up_el[ 0 ].childNodes[ 1 ].setAttribute("style", "visibility: hidden !important");
        }
    }
}
function showNewOpponentButton() {
    var follow_up_el = document.getElementsByClassName( "follow_up" );
    if ( follow_up_el ) {
        if ( follow_up_el[ 0 ] ) {
            follow_up_el[ 0 ].childNodes[ 1 ].setAttribute("style", "visibility: visible !important");
        }
    }
}

function loadObserver() {
    lichess_ground_observer = new MutationObserver(function(mutations) {
        mutations.forEach(function( mutation , index ) {
            if ( mutation.type === "childList" ) {
                if ( mutation.target.className === "table_inner" ) {
                    console.log( "Game OVER ???" );
                    hideNewOpponentButton();
                }
            }
            else if ( mutation.type === "attributes" ) {
                switch( mutation.target.className ) {
                    case "username user_link black offline":
                        console.log( "White Player === OFFLINE" );
                        break;                    
                    case "username user_link black offline":
                        console.log( "Black Player === OFFLINE" );
                        break;
                    case "button rematch white disabled":
                        console.log( "Rematch Button === WHITE ==== DISABLED" );
                        showNewOpponentButton();
                        break;
                    case "button rematch white enabled":
                        console.log( "Rematch Button === WHITE ==== ENABLED" );
                        //hideNewOpponentButton()
                        break;
                    case "button rematch black disabled":
                        console.log( "Rematch Button === BLACK ==== DISABLED" );
                        showNewOpponentButton();
                        break;
                    case "button rematch black enabled":
                        console.log( "Rematch Button === BLACK ==== ENABLED" );
                        //hideNewOpponentButton()
                        break;                                         
                    default:
                        break;
                }           
            }
        });
    });
    lichess_ground_observer.observe( lichess_ground_element , observerConfig );
    console.log( "Lichess Hide 'New Opponent' Button Script Loaded" );
}

(function() {
    var ready = setInterval(function(){
        var x1 = document.getElementsByClassName( lichess_ground_class_name );
        if ( x1 ) { if ( x1[ 0 ] ) { lichess_ground_element = x1[0]; clearInterval( ready ); loadObserver(); } }
    } , 2 );
})();