https://www.v2ex.com/t/596370

preLoadNextPage.js

// ==UserScript==
// @name            preLoadNextPage
// @author            autoxbc
// @version            1.0
// @match            *://movie.douban.com/*
// @run-at            document-start
// @require            https://cdnjs.cloudflare.com/ajax/libs/URI.js/1.19.1/URI.js
// @grant            GM_addStyle
// ==/UserScript==

const fn = target => {
    preLoadURL( target ,'.paginator .next a');

    const [ , , second , third ] = new URI().segment();
    if( second !== 'photos' || !['', undefined ].includes(third) )
        return;

    const article = target.querySelector('.article');
    if(!article)
        return;

    // 缩略图直接显示为大图
    [ ...article.querySelectorAll('.poster-col3 .cover > a > img') ].forEach( img => {
        const uri = new URI(img);
        if( uri.segment(1) === 'photo' && uri.segment(3) === 'public' )
            img.src = uri.segment( 2 ,'raw');
    } );

    GM_addStyle(`
        .aside ,
        #db-global-nav ,
        #db-nav-movie {
            display: none !important;
        }

        #wrapper {
            width: auto !important;
            max-width: none !important;
            padding: 0 30px !important;
            background-color: #333 !important;
        }

            #content h1 {
                padding: 25px 0 !important;
                color: #949494 !important;
                text-align: center !important;
            }

            .article {
                float: none !important;
                width: auto !important;
                padding-right: 0 !important;
            }

                .poster-col3 li {
                    float: none !important;
                    width: auto !important;
                    text-align: center !important;
                }

                    .poster-col3 .name {
                        color: #949494 !important;
                    }

                    .poster-col3 img {
                        max-height: none !important;
                    }
    `);
};

// 通用 DOM 突变监听
addEventListener('DOMContentLoaded', ({ target }) => {
    const callback = mttns => mttns.forEach( ({ addedNodes }) => [...addedNodes].forEach( target => fn(target) ) );
    new MutationObserver(callback).observe( document , { childList: true , subtree: true } );

    fn(target);
} );

function preLoadURL( target , selector )
{
    const nextPageButton = document.querySelector(selector);

    switch(false)
    {
        case !!nextPageButton :
        case self === top :
        case [ document , document.body ].includes(target):
            return;
    }

    const iframe = Object.assign( document.createElement('iframe') , {
        src:     nextPageButton.href ,
        style:    `
            height: 0 !important;
            width: 0 !important;
            visibility: hidden !important;
        `,
    } );

    nextPageButton.onclick = () => {
        history.replaceState( null , null , iframe.src );
        document.body.replaceWith( iframe.contentWindow.document.body );
        scrollTo( 0 , 0 );

        return false ;
    };

    document.body.append(iframe);
}