封装常用代码

getElementsByClassName

附上一片关于getElementsByClassName的文章一篇   http://hszy00232.blog.163.com/blog/static/43022753201042051443548/

function getElementsByClassName(oElem, strTagName, strClassName){   
    var arrElements = (strTagName == '*' && oElem.all) ? oElem.all : oElem.getElementsByTagName(strTagName);
    var returnArrElements = new Array();   
    var oRegExp =  new RegExp('(^|\\s)' + strClassName + '($|\\s)');   
    for(var i=0; i<arrElements.length; i++){   
        if (oRegExp.test(arrElements[i].className)){   
            returnArrElements.push(arrElements[i]);   
            }   
        }   
    return (returnArrElements);
}

addClass  removeClass

function addClass(element, className){
    if(!element.className){
    element.className = className;
    }
    else{
        element.className+= " "+className;        
    }
}
function removeClass(element, className){
    if (!element) return;
    var elementClassName = element.className;
    if (elementClassName.length == 0) return;
    if(elementClassName == className){
        element.className = "";
        return;
    }
    if(elementClassName.match(new RegExp("(^|\\s)" + className + "(\\s|$)"))){
        element.className = elementClassName.replace((new RegExp("(^|\\s)" + className + "(\\s|$)"))," ");
    }
}

 数据

var get = {
    byId: function(id) {
        return document.getElementById(id)
    },
    byClass: function(sClass, oParent) {
        var aClass = [];
        var aElem = this.byTagName("*", oParent);
        for(var i = 0; i < aElem.length; i++) aElem[i].className == sClass && aClass.push(aElem[i]);
        return aClass
    },
    byTagName: function(elem, obj) {
        return (obj || document).getElementsByTagName(elem)
    }
};