js 实现insertAfter

 

function insertAfter(ele,html){
    var new_ele = document.createElement("div");
    new_ele.innerHTML = html;
    var parent = ele.parentNode || document.body;
    parent.insertBefore(new_ele.firstChild, ele.nextSibling);
}

var d = document.getElementById("test");
insertAfter(d,"<div>dddddddd</div>")

 

 

<div id="test">a
    <div>Item1</div>
    <div>Item2</div>
    <div>Item3</div>
    <div>Item4</div>b
</div>

 

var d = document.getElementById("test");
d.childNodes;//...
d.previousSibling;//null
d.nextSibling;//null
d.parentNode;//body
d.firstChild;//a
d.lastChild;//b
d.lastChild.textContent;//b
d.lastChild.previousSibling.innerHTML;//Item4

d.childElementCount;//4
d.lastElementChild;//<div>Item4</div>

d.childNodes.length;//9
d.childNodes[0];//"a"
d.childNodes[1];//<div>Item1</div>
d.childNodes[2];//""