function onStyleChange(){
    alert(document.getElementById(‘digistat‘).className);
}
function onIeChange(p){#可以添加的按钮onchange事件
if(event.propertyName == ‘digistaterr‘){
    onStyleChange();
}
}
if(window.MutationObserver){
    var observer = new MutationObserver(function(mrs){
    if(mrs[0].attributeName == ‘class‘)
    onStyleChange();
});
observer.observe(document.getElementById(‘digistat‘), {
    ‘attributes‘: true
});
}