定义js数组的方式有：
var arr = ();
var arr = [];
var arr = new Array();
如何拼接成一个json字段。
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> obj TO JSON Demo </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
</HEAD>
<SCRIPT type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></SCRIPT>
<script type="text/javascript" src="js/jquery.json-2.4.min.js"></script>
<BODY>
<h2>利用jquery-json将js对象转化为JSON床</h2>
<INPUT TYPE="button" VALUE="生成JSON串" ONCLICK="" id="testBut"><br/>
<div id="showDiv" style="display:none"> <div>
</BODY>
<script type="text/javascript">
function student(sid,name,age,classInfo){
this.sid=sid;
this.name=name;
this.aeg=age;
this.classInfo=classInfo;
}
function classInfo(classname,teacher){
this.classname=classname;
this.teacher=teacher;
}
$(function(){
$("#testBut").click(function(){
var students = new Array();
arry = new classInfo('三年级一班','项正伟');
students[0]=new student(2014001,'蔡子旭',23,arry);
students[1]=new student(2014002,'张苞',24,arry);
students[2]=new student(2014003,'张颌',33,arry);
var jsonStr=$.toJSON(students);
$("#showDiv").show();
$("#showDiv").text(jsonStr); });
});
</script>
</HTML>