IE9以下报错：对象不支持“stopPropagation”属性或方法
if (event.stopPropagation) {
// 针对 Mozilla 和 Opera
event.stopPropagation();
}
else if (window.event) {
// 针对 IE
window.event.cancelBubble = true;
}
原文：http://www.cnblogs.com/sueris/p/6952577.html