/**
 * addEventHandler方法
 * 跨浏览器实现事件绑定
 */

function addEventHandler(ele, event, hanlder) {
    if (ele.addEventListener) {
        ele.addEventListener(event, hanlder, false);
    } else if (ele.attachEvent) {
        ele.attachEvent("on"+event, hanlder);
    } else  {
        ele["on" + event] = hanlder;
    }
}