Function getCollapsedAnswerObserver

Zhihu-Enhanced.user.js:181–232

()

// 添加收起回答观察器
function getCollapsedAnswerObserver() {
    if (!window._collapsedAnswerObserver) {
        const observer = new MutationObserver(mutations => {
            for (const mutation of mutations) {
                if (mutation.target.hasAttribute('script-collapsed')) return
                // 短的回答
                if (mutation.target.classList.contains('RichContent')) {
                    for (const addedNode of mutation.addedNodes) {
                        if (addedNode.nodeType != Node.ELEMENT_NODE) continue
                        if (addedNode.className != 'RichContent-inner') continue
                        if (addedNode.offsetHeight < 400) break
                        //console.log('111',addedNode, addedNode.classList, addedNode.classList.contains('RichContent-inner'), addedNode.offsetHeight, addedNode.textContent.length)
                        const button = mutation.target.querySelector('.ContentItem-actions.Sticky [data-zop-retract-question]');
                        if (button) {
                            mutation.target.setAttribute('script-collapsed', '');
                            button.click();
                            return
                        }
                    }
                // 长的回答
                } else if (mutation.target.tagName === 'DIV' && !mutation.target.style.cssText && !mutation.target.className) {
                    if (mutation.target.parentElement.hasAttribute('script-collapsed')) return
                    //console.log('222',mutation.target, mutation.target.querySelector('.ContentItem-actions.Sticky [data-zop-retract-question]'))
                    const button = mutation.target.querySelector('.ContentItem-actions.Sticky [data-zop-retract-question]');
                    if (button) {
                        mutation.target.parentElement.setAttribute('script-collapsed', '');
                        button.click();
                        return
                    }
                }
            }
        })

        observer.start = function() {
            if (!this._active) {
                this.observe(document, { childList: true, subtree: true });
                this._active = true;
            }
        }
        observer.end = function() {
            if (this._active) {
                this.disconnect();
            }
        }

        window.addEventListener('urlchange', function() {
            observer[location.href.indexOf('/answer/') === -1 ? 'start' : 'end']();
        })
        window._collapsedAnswerObserver = observer;
    }
    return window._collapsedAnswerObserver
}


// 默认收起回答