MutationObserver

[shoutingwei]

var target=document.getElementById('target');
var i=0
var observe=new MutationObserver(function (mutations,observe) {
    i++   
});
observe.observe(target,{ childList: true});
target.appendChild(docuemnt.createTextNode('1'));
target.appendChild(docuemnt.createTextNode('2'));
target.appendChild(docuemnt.createTextNode('3'));
console.log(i)                //1

var observe=new MutationObserver(function (mutations,observe) {
    console.log(mutations);
    //observe.discount();     
});

observe.observe(target,{ childList: true});
target.appendChild(document.createTextNode('新增Text节点'));   //增加节点，观察到变化
target.childNodes[0].remove();                                //删除节点，可以观察到
target.childNodes[0].textContent='改变子节点的后代';             //不会观察到

MutationEvent	MutationObserver options
DOMNodeInserted	{ childList: true, subtree: true }
DOMNodeRemoved	{ childList: true, subtree: true }
DOMSubtreeModified	{ childList: true, subtree: true }
DOMAttrModified	{ attributes: true, subtree: true }
DOMCharacterDataModified	{ characterData: true, subtree: true }