JS整理,getCookie, getElementsByClassName , 添加删除事件

Cookie:

 

 1function getCookie(c_name)
 2{
 3    if (document.cookie.length>0)
 4  {
 5        c_start=document.cookie.indexOf(c_name + "=");
 6        if (c_start!=-1)
 7        { 
 8            c_start=c_start + c_name.length+1;
 9            c_end=document.cookie.indexOf(";",c_start);
            if (c_end==-1)
                c_end=document.cookie.length;
            return decodeURIComponent(document.cookie.substring(c_start,c_end));
        }
    }
    return null;
}

function setCookie(c_name,value,expiredays)
{
    var exdate=new Date();
    exdate.setDate(exdate.getDate()+expiredays);
    document.cookie=c_name+ "=" +escape(value)+((expiredays==null) ? "" : ";expires="+exdate);
}

getElementsByClassName:

 

 1function getElementsByClassName(searchClass, domNode, tagName) {
 2    alert(searchClass);
 3    if (domNode == null) domNode = document;
 4    if (tagName == null) tagName = '*';
 5    var el = new Array();
 6    var tags = domNode.getElementsByTagName(tagName);
 7    var tcl = " "+searchClass+" ";
 8    for(i=0,j=0; i<tags.length; i++) {
 9        var test = " " + tags[i].className + " ";
        if (test.indexOf(tcl) != -1)
        el[j++] = tags[i];
    }

    alert(el);
    return el;
}

 

Event

 

 1var EventUtil=new Object;
 2    //oTarget：目标；sEventType：事件名称；funName：事件触发的函数名；
 3    EventUtil.addEvent=function(oTarget,sEventType,funName){
 4        if(oTarget.addEventListener){//for DOM;
 5            oTarget.addEventListener(sEventType,funName, false);
 6        }else if(oTarget.attachEvent){
 7            oTarget.attachEvent("on"+sEventType,funName);
 8        }else{
 9            oTarget["on"+sEventType]=funName;
        }
    };

    EventUtil.removeEvent=function(oTarget,sEventType,funName){
        if(oTarget.removeEventListener){//for DOM;
            oTarget.removeEventListener(sEventType,funName, false);
        }else if(oTarget.detachEvent){
            oTarget.detachEvent("on"+sEventType,funName);
        }else{
            oTarget["on"+sEventType]=null;
        }
    };

 

 

比较实用的,不需要很多无用的代码.