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[英]Javascript blocking multible scripts with mutation observer doese't work
[英]Simple mutation observer example in JavaScript doesn't work
我尝试在我的网页中添加MutationObserver
来跟踪图像src
更改,但这不起作用。
这是使用的代码:
setTimeout(function() { document.getElementById("img").src = "http://i.stack.imgur.com/aQsv7.jpg" }, 2000); var target = document.querySelector('#img'); var observer = new MutationObserver(function(mutations) { mutations.forEach(function(mutation) { console.log(mutation.type); }); }); var config = { attributes: true, childList: false, characterData: false }; observer.observe(target, config); observer.disconnect();
<img src="http://i.stack.imgur.com/k7HT5.jpg" id="img" class="pic" height="100">
如果您调用disconnect
方法,您将不再收到通知:
disconnect()
阻止MutationObserver实例接收DOM突变的通知。 在再次使用observe()方法之前,将不会调用观察者的回调。
setTimeout(function() { document.getElementById("img").src = "http://i.stack.imgur.com/aQsv7.jpg" }, 2000); setTimeout(function() { document.getElementById("img").src = "http://i.imgur.com/Xw6htaT.jpg" }, 4000); var target = document.querySelector('#img'); var observer = new MutationObserver(function(mutations) { mutations.forEach(function(mutation) { console.log(mutation.type); }); }); var config = { attributes: true, childList: true, characterData: true }; observer.observe(target, config); // otherwise observer.disconnect(); observer.observe(target, config);
<img src="http://i.stack.imgur.com/k7HT5.jpg" id="img" class="pic" height="100">
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