DOM监听-监听节点变化-addEventListener_DOMSubtreeModified

snippet_addEventListener.js

//js_snippet_addEventListener_DOMSubtreeModified

function triggerPageEvent(frame) {
    var _targetElement = frame.document.getElementById('SlideLabel-Medium14').getElementsByTagName('span')[0];
    if(_targetElement.addEventListener){
          _targetElement.addEventListener('DOMSubtreeModified', function(){
          //todo anything you want
          getCurrentPageNo(_targetElement.innerHTML, frame);
      }, false);
    }else{
        console.error('addEventListener is not a function',400);
    }
}