例 1.6(replaceChildIEFF.html)
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
    <meta http-equiv="content-type" content="text/html; charset=utf-8"/>
<div id="contain">
    <div id="a">a </div>
    <div id="b">b </div>
    <div id="c">c </div>

var contain = document.getElementById("contain");
var b =  document.getElementById("b");
var p =  document.createElement("p");/*这句话后创建了一个<p>*/
Node.replaceChild() (Method)
A means of replacing child objects with new nodes and discarding the old ones.
The new node must be created using the createElement method.

Property/method value type: Node object
JavaScript syntax: - myNode.replaceChild(newNode, oldNode)
Argument list: newNode The node to be placed into the hierarchy
oldNode The node to be replaced

contain.replaceChild( p , b  );