YouTube在主页上的动态加载如何工作？

发布于 2025-02-01 17:46:15 字数 210 浏览 4 评论 0原文

我正在制作一个扩展程序，该扩展名将在主页上的每个视频下放置一个按钮，但是我很快发现，只需使用SelectAll语句就不可能。 Selectall语句唯一的事情是它在主页上检索前3行视频。我认为正在发生的事情是在加载页面后正在加载视频，因此元素在“ document_end”上不存在（这是我的Chrome扩展名将JS/CSS注入页面上的时候）。我会寻找类似活动听众的东西，但解释了为什么会发生这种情况。

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反目相谮 2025-02-08 17:46:15

您可以通过使用 mutationObserservers 在您的内容脚本中。

示例在下面的MDN Web文档中，您应该能够通过在回调函数中使用document.queryselectorall（）来调用并查找新元素。

// Keep track of DOM element changes under <html> and run callback with mutationsList and observer once DOM changes
// Select the node that will be observed for mutations
const targetNode = document.getElementById('some-id');

// Options for the observer (which mutations to observe)
const config = { attributes: true, childList: true, subtree: true };

// Callback function to execute when mutations are observed
const callback = function(mutationList, observer) {
    // Use traditional 'for loops' for IE 11
    for(const mutation of mutationList) {
        if (mutation.type === 'childList') {
            console.log('A child node has been added or removed.');
        }
        else if (mutation.type === 'attributes') {
            console.log('The ' + mutation.attributeName + ' attribute was modified.');
        }
    }
};

// Create an observer instance linked to the callback function
const observer = new MutationObserver(callback);

// Start observing the target node for configured mutations
observer.observe(targetNode, config);

// Later, you can stop observing
observer.disconnect();

You could solve this by using MutationObservers in your content script.

Example from mdn web docs below, you should be able to call and find new elements by using document.querySelectorAll() inside the callback function.

// Keep track of DOM element changes under <html> and run callback with mutationsList and observer once DOM changes
// Select the node that will be observed for mutations
const targetNode = document.getElementById('some-id');

// Options for the observer (which mutations to observe)
const config = { attributes: true, childList: true, subtree: true };

// Callback function to execute when mutations are observed
const callback = function(mutationList, observer) {
    // Use traditional 'for loops' for IE 11
    for(const mutation of mutationList) {
        if (mutation.type === 'childList') {
            console.log('A child node has been added or removed.');
        }
        else if (mutation.type === 'attributes') {
            console.log('The ' + mutation.attributeName + ' attribute was modified.');
        }
    }
};

// Create an observer instance linked to the callback function
const observer = new MutationObserver(callback);

// Start observing the target node for configured mutations
observer.observe(targetNode, config);

// Later, you can stop observing
observer.disconnect();

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