MutationObserver wrapper to wait for the specified CSS selector
目前为
此脚本不应直接安装，它是一个供其他脚本使用的外部库。如果您需要使用该库，请在脚本元属性加入：// @require https://update.cn-greasyfork.org/scripts/12228/137072/setMutationHandler.js
/* EXAMPLE:
setMutationHandler(document, '.container p.some-child', function(nodes) {
// single node:
nodes[0].remove();
// or multiple nodes:
nodes.forEach(function(node) {
node.style.display = 'none';
});
//this.disconnect(); // disconnect the observer, this is useful for one-time jobs
return true; // continue enumerating current batch of mutations
});
*/
// ==UserScript==
// @name setMutationHandler
// @description MutationObserver wrapper to wait for the specified CSS selector
// @namespace wOxxOm.scripts
// @author wOxxOm
// @grant none
// @version 2.0.6
// ==/UserScript==
function setMutationHandler(baseNode, selector, cb, options) {
var queue = [];
var ob = new MutationObserver(function handler(mutations) {
if (mutations && mutations.length > 100) {
if (!queue.length)
setTimeout(handler, 0);
queue.push(mutations);
return;
}
do {
if (!mutations) {
mutations = queue.shift();
if (!mutations)
return;
}
for (var i=0, ml=mutations.length, m; (i<ml) && (m=mutations[i]); i++) {
switch (m.type) {
case 'childList':
if (m.addedNodes[0] && m.addedNodes[0].nodeType == 3) { // TEXT_NODE
if (m.target.matches(selector) && !cb.call(ob, [m.target], m))
return;
continue;
}
for (var j=0, nodes=m.addedNodes, nl=nodes.length, n; (j<nl) && (n=nodes[j]); j++)
if (n.nodeType == 1) { // ELEMENT_NODE
if (n.matches(selector))
n = [n];
else if (n.querySelector(selector))
n = Array.prototype.slice.call(n.querySelectorAll(selector));
else
continue;
if (!cb.call(ob, n, m))
return;
}
break;
case 'attributes':
if (m.target.matches(selector) && !cb.call(ob, [m.target], m))
return;
break;
case 'characterData':
if (m.target.parentNode && m.target.parentNode.matches(selector) && !cb.call(ob, [m.target.parentNode], m))
return;
break;
}
}
mutations = null;
} while (queue.length);
});
ob.observe(baseNode, options || {subtree:true, childList:true});
return ob;
}