应twinsen要求写了个转换js对象为json字符串的例子
这个是基本的实现：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> json-to-string </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="emu">
<META NAME="Keywords" CONTENT="json convert">
<META NAME="Description" CONTENT="convert a javascript object into a JSON string">
</HEAD>
<BODY>
<SCRIPT LANGUAGE="JavaScript">
<!--
var data={host:{url:"ad.market.com",page:[{name:"all",area:[{name:"rightbanner",tname:"all",tclass:"none",type:"jpg",ad:[{url:"abc.gif",width:"",height:"",menu:"red",tran:"",href:"http://music.qq.com",alt:"aaaaaaaaa",target:"_blank",top:"",bottom:"",left:"",right:""}]},{name:"leftbanner",tname:"all",tclass:"none",type:"jpg",ad:[{url:"",width:"",height:"",menu:"red",tran:"",href:"http://music.qq.com",alt:"aaaaaaaaa",target:"_blank",top:"",bottom:"",left:"",right:""}]}]},{name:"index.htm",area:[{name:"rightbanner",tname:"index.htm",tclass:"none",type:"swf",ad:[{url:"abcdef.swf",width:"",height:"",menu:"red",tran:"",href:"http://music.qq.com",alt:"aaaaaaaaa",target:"_blank",top:"",bottom:"",left:"",right:""}]},{name:"leftbanner",tname:"index.htm",tclass:"none",type:"text",ad:[{url:"",width:"",height:"",menu:"red",tran:"",href:"http://music.qq.com",alt:"aaaaaaaaa",target:"_blank",top:"",bottom:"",left:"",right:""},{url:"",width:"",height:"",menu:"red",tran:"",href:"http://music.qq.com",alt:"aaaaaaaaa",target:"_blank",top:"",bottom:"",left:"",right:""},{url:"",width:"",height:"",menu:"red",tran:"",href:"http://music.qq.com",alt:"aaaaaaaaa",target:"_blank",top:"",bottom:"",left:"",right:""}]}]}]}}
function obj2str(o){
var r = [];
if(typeof o =="string") return """+o.replace(/(['"/])/g,"/$1").replace(/( )/g,"/n").replace(/( )/g,"/r").replace(/( )/g,"/t")+""";
if(typeof o == "object"){
if(!o.sort){
r[0]="{"
for(var i in o){
r[r.length]=i;
r[r.length]=":";
r[r.length]=obj2str(o[i]);
r[r.length]=",";
}
r[r.length-1]="}"
}else{
r[0]="["
for(var i =0;i<o.length;i++){
r[r.length]=obj2str(o[i]);
r[r.length]=",";
}
r[r.length-1]="]"
}
return r.join("");
}
return o.toString();
}
alert(obj2str(data))
//-->
</SCRIPT>
</BODY>
</HTML>
<HTML>
<HEAD>
<TITLE> json-to-string </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="emu">
<META NAME="Keywords" CONTENT="json convert">
<META NAME="Description" CONTENT="convert a javascript object into a JSON string">
</HEAD>
<BODY>
<SCRIPT LANGUAGE="JavaScript">
<!--
var data={host:{url:"ad.market.com",page:[{name:"all",area:[{name:"rightbanner",tname:"all",tclass:"none",type:"jpg",ad:[{url:"abc.gif",width:"",height:"",menu:"red",tran:"",href:"http://music.qq.com",alt:"aaaaaaaaa",target:"_blank",top:"",bottom:"",left:"",right:""}]},{name:"leftbanner",tname:"all",tclass:"none",type:"jpg",ad:[{url:"",width:"",height:"",menu:"red",tran:"",href:"http://music.qq.com",alt:"aaaaaaaaa",target:"_blank",top:"",bottom:"",left:"",right:""}]}]},{name:"index.htm",area:[{name:"rightbanner",tname:"index.htm",tclass:"none",type:"swf",ad:[{url:"abcdef.swf",width:"",height:"",menu:"red",tran:"",href:"http://music.qq.com",alt:"aaaaaaaaa",target:"_blank",top:"",bottom:"",left:"",right:""}]},{name:"leftbanner",tname:"index.htm",tclass:"none",type:"text",ad:[{url:"",width:"",height:"",menu:"red",tran:"",href:"http://music.qq.com",alt:"aaaaaaaaa",target:"_blank",top:"",bottom:"",left:"",right:""},{url:"",width:"",height:"",menu:"red",tran:"",href:"http://music.qq.com",alt:"aaaaaaaaa",target:"_blank",top:"",bottom:"",left:"",right:""},{url:"",width:"",height:"",menu:"red",tran:"",href:"http://music.qq.com",alt:"aaaaaaaaa",target:"_blank",top:"",bottom:"",left:"",right:""}]}]}]}}
function obj2str(o){
var r = [];
if(typeof o =="string") return """+o.replace(/(['"/])/g,"/$1").replace(/( )/g,"/n").replace(/( )/g,"/r").replace(/( )/g,"/t")+""";
if(typeof o == "object"){
if(!o.sort){
r[0]="{"
for(var i in o){
r[r.length]=i;
r[r.length]=":";
r[r.length]=obj2str(o[i]);
r[r.length]=",";
}
r[r.length-1]="}"
}else{
r[0]="["
for(var i =0;i<o.length;i++){
r[r.length]=obj2str(o[i]);
r[r.length]=",";
}
r[r.length-1]="]"
}
return r.join("");
}
return o.toString();
}
alert(obj2str(data))
//-->
</SCRIPT>
</BODY>
</HTML>
要是想重载系统的native code函数（比如toString，join），就要根据不同的浏览器上不同的内部函数的具体表现做特殊对待了。比如重载toString函数在IE里面是默认遍历不到的，而firefox偏偏就可以。下面的例子在IE和firefox下面测试通过：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> json-to-string </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="emu">
<META NAME="Keywords" CONTENT="json convert">
<META NAME="Description" CONTENT="convert a javascript object into a JSON string">
</HEAD>
<BODY>
<SCRIPT LANGUAGE="JavaScript">
<!--
var data={host:{url:"ad.market.com",page:[{name:"all",area:[{name:"rightbanner",tname:"all",tclass:"none",type:"jpg",ad:[{url:"abc.gif",width:"",height:"",menu:"red",tran:"",href:"http://music.qq.com",alt:"aaaaaaaaa",target:"_blank",top:"",bottom:"",left:"",right:""}]},{name:"leftbanner",tname:"all",tclass:"none",type:"jpg",ad:[{url:"",width:"",height:"",menu:"red",tran:"",href:"http://music.qq.com",alt:"aaaaaaaaa",target:"_blank",top:"",bottom:"",left:"",right:""}]}]},{name:"index.htm",area:[{name:"rightbanner",tname:"index.htm",tclass:"none",type:"swf",ad:[{url:"abcdef.swf",width:"",height:"",menu:"red",tran:"",href:"http://music.qq.com",alt:"aaaaaaaaa",target:"_blank",top:"",bottom:"",left:"",right:""}]},{name:"leftbanner",tname:"index.htm",tclass:"none",type:"text",ad:[{url:"",width:"",height:"",menu:"red",tran:"",href:"http://music.qq.com",alt:"aaaaaaaaa",target:"_blank",top:"",bottom:"",left:"",right:""},{url:"",width:"",height:"",menu:"red",tran:"",href:"http://music.qq.com",alt:"aaaaaaaaa",target:"_blank",top:"",bottom:"",left:"",right:""},{url:"",width:"",height:"",menu:"red",tran:"",href:"http://music.qq.com",alt:"aaaaaaaaa",target:"_blank",top:"",bottom:"",left:"",right:""}]}]}]},toString:function(){return obj2str(this)}}
function obj2str(o){
var r = [];
if(typeof o =="string") return """+o.replace(/(['"/])/g,"/$1").replace(/( )/g,"/n").replace(/( )/g,"/r").replace(/( )/g,"/t")+""";
if(typeof o == "object"){
if(!o.sort){
r[0]="{"
for(var i in o){
r[r.length]=i;
r[r.length]=":";
r[r.length]=obj2str(o[i]);
r[r.length]=",";
}
if(!!document.all && !/^ ?functions*toString()s*{ ?s*[native code] ?s*} ?s*$/.test(o.toString)){
r[r.length]="toString:"+o.toString.toString();
r[r.length]=",";
}
r[r.length-1]="}"
}else{
r[0]="["
for(var i =0;i<o.length;i++){
r[r.length]=obj2str(o[i]);
r[r.length]=",";
}
r[r.length-1]="]"
}
return r.join("");
}
return o.toString();
}
alert(obj2str(data))
//-->
</SCRIPT>
</BODY>
</HTML>
<HTML>
<HEAD>
<TITLE> json-to-string </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="emu">
<META NAME="Keywords" CONTENT="json convert">
<META NAME="Description" CONTENT="convert a javascript object into a JSON string">
</HEAD>
<BODY>
<SCRIPT LANGUAGE="JavaScript">
<!--
var data={host:{url:"ad.market.com",page:[{name:"all",area:[{name:"rightbanner",tname:"all",tclass:"none",type:"jpg",ad:[{url:"abc.gif",width:"",height:"",menu:"red",tran:"",href:"http://music.qq.com",alt:"aaaaaaaaa",target:"_blank",top:"",bottom:"",left:"",right:""}]},{name:"leftbanner",tname:"all",tclass:"none",type:"jpg",ad:[{url:"",width:"",height:"",menu:"red",tran:"",href:"http://music.qq.com",alt:"aaaaaaaaa",target:"_blank",top:"",bottom:"",left:"",right:""}]}]},{name:"index.htm",area:[{name:"rightbanner",tname:"index.htm",tclass:"none",type:"swf",ad:[{url:"abcdef.swf",width:"",height:"",menu:"red",tran:"",href:"http://music.qq.com",alt:"aaaaaaaaa",target:"_blank",top:"",bottom:"",left:"",right:""}]},{name:"leftbanner",tname:"index.htm",tclass:"none",type:"text",ad:[{url:"",width:"",height:"",menu:"red",tran:"",href:"http://music.qq.com",alt:"aaaaaaaaa",target:"_blank",top:"",bottom:"",left:"",right:""},{url:"",width:"",height:"",menu:"red",tran:"",href:"http://music.qq.com",alt:"aaaaaaaaa",target:"_blank",top:"",bottom:"",left:"",right:""},{url:"",width:"",height:"",menu:"red",tran:"",href:"http://music.qq.com",alt:"aaaaaaaaa",target:"_blank",top:"",bottom:"",left:"",right:""}]}]}]},toString:function(){return obj2str(this)}}
function obj2str(o){
var r = [];
if(typeof o =="string") return """+o.replace(/(['"/])/g,"/$1").replace(/( )/g,"/n").replace(/( )/g,"/r").replace(/( )/g,"/t")+""";
if(typeof o == "object"){
if(!o.sort){
r[0]="{"
for(var i in o){
r[r.length]=i;
r[r.length]=":";
r[r.length]=obj2str(o[i]);
r[r.length]=",";
}
if(!!document.all && !/^ ?functions*toString()s*{ ?s*[native code] ?s*} ?s*$/.test(o.toString)){
r[r.length]="toString:"+o.toString.toString();
r[r.length]=",";
}
r[r.length-1]="}"
}else{
r[0]="["
for(var i =0;i<o.length;i++){
r[r.length]=obj2str(o[i]);
r[r.length]=",";
}
r[r.length-1]="]"
}
return r.join("");
}
return o.toString();
}
alert(obj2str(data))
//-->
</SCRIPT>
</BODY>
</HTML>
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