js常用方法

 摘自《JavaScript_DOM编程艺术》

1.在html加载完时加载方法

function addLoadEvent(func){

    var oldonload = window.onload;

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

        window.onload = func;

    }else{

        window.onload = function(){

            oldonload();

            func();

        }

    }

}

 

2.在现有元素后插入一个新元素

function insertAfter(newElement, targetElement) {

    var parent = targetElement.parentNode;

    if (parent.lastChild == targetElement) {

        parent.appendChild(newElement);

    } else {

        parent.insertBefore(newElement, targetElement.nextSibling);

    }

}