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  • 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","",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:"","",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","",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:"","",height:"",menu:"red",tran:"",href:"http://music.qq.com",alt:"aaaaaaaaa",target:"_blank",top:"",bottom:"",left:"",right:""},{url:"","",height:"",menu:"red",tran:"",href:"http://music.qq.com",alt:"aaaaaaaaa",target:"_blank",top:"",bottom:"",left:"",right:""},{url:"","",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","",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:"","",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","",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:"","",height:"",menu:"red",tran:"",href:"http://music.qq.com",alt:"aaaaaaaaa",target:"_blank",top:"",bottom:"",left:"",right:""},{url:"","",height:"",menu:"red",tran:"",href:"http://music.qq.com",alt:"aaaaaaaaa",target:"_blank",top:"",bottom:"",left:"",right:""},{url:"","",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
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  • 原文地址：https://www.cnblogs.com/stonehuang/p/6603211.html
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