JavaScript之事件绑定多个序列执行方法

//一种事件绑定多个方法：以加载事件为例
function addEventLoad(func,isLog) {
    var oldOnLoad = window.onload;
    if (typeof window.onload != 'function') {
        window.onload = func;
    } else {
        window.onload = function() {
            oldOnLoad();
            func();
        }
    }
    if(isLog != undefined && isLog == true)
        console.info("[addEventLoad:SUCCESS]:" + func);
    return this;
}

//拓展：一个节点绑定多种事件
function addEvent(element,eventType,handle,bol){
    if (typeof handle != 'function') {
        throw new Error("[addEvent] func must be a function."); 
    } else{
        if(element.nodeType){
            throw new Error("[addEvent]  arguments:'element' id not element node!");
        } else {
            if(element.addEventListener){           //如果支持addEventListener
                element.addEventListener(eventType, handle, bol);
            }else if(element.attachEvent){          //如果支持attachEvent
                element.attachEvent("on" + eventType, handle);//IE8 以下
            }else{                                  //否则使用兼容的onclick绑定
                element["on" + eventType] = handle;
            }
        }
    }
}

//拓展
function bind(element,eventType,fn){
    if(element.addEventListener){
        element.addEventListener(eventType, fn, false);
    }else if(element.attachEvent){
        element.attachEvent('on'+ eventType, fn);
    }
    console.log('[bind] bind success.');
}