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>

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>

 原文链接