js事件形参兼容

function handleEvent(event) {
    event = event || window.event; // 兼容IE
    var target = event.target || event.srcElement; // 兼容IE
    console.log(target);
}

// 使用匿名函数包装
document.getElementById('myButton').onclick = function(event) {
    event = event || window.event;
    // 处理事件
};

// 兼容性事件绑定
function addEvent(element, eventType, handler) {
    if (element.addEventListener) {
        element.addEventListener(eventType, handler, false);
    } else if (element.attachEvent) { // 兼容IE8及以下
        element.attachEvent('on' + eventType, handler);
    } else {
        element['on' + eventType] = handler;
    }
}

addEvent(document.getElementById('myButton'), 'click', function(event) {
    event = event || window.event;
    var target = event.target || event.srcElement;
    console.log(target);
});