读JavaScript DOM编程艺术笔记

1.获得当前元素的下一个元素

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function getNextElement(node){

    if(node.nodeType==1){

        return node;

    }

    if(node.nextSibling){

        return getNextElement(node.nextSibling);

    }

    return null;

};

2.外部引入的js，添加页面加载方法

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function addLoadEvent(func){

    var oldonload=window.onload;

    if(typeof window.onload!='function'){

        window.onload=func;

    }else{

        window.onload=function(){

            oldonload();

            func();

        }

    }

};

3.insertAfter方法

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function insertAfter(newElement,targetElement){

    var parent=targetElement.parentNode;

    if(parent.lastChild==targetElement){

        parent.appendChild(newElement);

    }else{

        parent.insertBefore(newElement,targetElement.nextSibling);

    }

};

4.添加class

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function addClass(element,value){

    if(!element.className){

        element.className=value;

    }else{

        newClassName=element.className;

        element.className=newClassName+" "+value;  

    }

}