TA貢獻1803條經(jīng)驗 獲得超3個贊
IE9+，F(xiàn)F，Webkit：
使用突變觀察員回到不受歡迎的地方突變事件如有需要：
(下面的例子是，如果僅針對附加或刪除節(jié)點的DOM更改)
var observeDOM = (function(){
var MutationObserver = window.MutationObserver || window.WebKitMutationObserver;
return function( obj, callback ){
if( !obj || !obj.nodeType === 1 ) return; // validation
if( MutationObserver ){
// define a new observer
var obs = new MutationObserver(function(mutations, observer){
callback(mutations);
})
// have the observer observe foo for changes in children
obs.observe( obj, { childList:true, subtree:true });
}
else if( window.addEventListener ){
obj.addEventListener('DOMNodeInserted', callback, false);
obj.addEventListener('DOMNodeRemoved', callback, false);
}
}
})();
//------------< DEMO BELOW >----------------
// add item
var itemHTML = "<li><button>list item (click to delete)</button></li>",
listElm = document.querySelector('ol');
document.querySelector('body > button').onclick = function(e){
listElm.insertAdjacentHTML("beforeend", itemHTML);
}
// delete item
listElm.onclick = function(e){
if( e.target.nodeName == "BUTTON" )
e.target.parentNode.parentNode.removeChild(e.target.parentNode);
}
// Observe a specific DOM element:
observeDOM( listElm, function(m){
var addedNodes = [], removedNodes = [];
m.forEach(record => record.addedNodes.length & addedNodes.push(...record.addedNodes))
m.forEach(record => record.removedNodes.length & removedNodes.push(...record.removedNodes))
console.clear();
console.log('Added:', addedNodes, 'Removed:', removedNodes);
});
// Insert 3 DOM nodes at once after 3 seconds
setTimeout(function(){
listElm.removeChild(listElm.lastElementChild);
listElm.insertAdjacentHTML("beforeend", Array(4).join(itemHTML));
}, 3000);
<button>Add Item</button>
<ol>
<li><button>list item (click to delete)</button></li>
<li><button>list item (click to delete)</button></li>
<li><button>list item (click to delete)</button></li>
<li><button>list item (click to delete)</button></li>
<li><em>…More will be added after 3 seconds…</em></li>
</ol>
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