js模仿jquery里的几个方法parent, parentUntil, children

有时工作需要, 也是接着上一章的方法, 用js模仿jquery里的几个方法parent, parentUntil, children.

 

function parent(node){

    return node.parentNode || null;

}



function parentUntil(node, parentNode){

    while(parent(node) != parentNode){

        node = parent(node);

    }

    return parentNode;

}



function children(parentNode){

    var children,

        length,

        nodeArray = [],

        i = 0;

    if(parentNode.nodeType === 1){

        children = parentNode.children || parentNode.childNodes; //兼顾一下ff3.6以下的版本, 当然也可以不考虑了, 直接用children

        length = children.length;

        for(; i < length; i++){

            if(children[i].nodeType !== 1){

                continue;

            }

            nodeArray.push(children[i]);

        }

        return nodeArray;

    }

    else{

        return null;

    }

}