关于javascriptjson的信息

http://www.itjxue.com  2023-01-07 03:31  来源:未知  点击次数: 

如何将 javascript 对象转换成 json字符串

javascript 对象转换成 json字符串[js对象转换成json字符串]

使用$.toJSON(Object)就可以转换了,转换之前先引入jquery.json.js

/*

* jQuery JSON Plugin

* version: 2.1 (2009-08-14)

*

* This document is licensed as free software under the terms of the

* MIT License:

*

* Brantley Harris wrote this plugin. It is based somewhat on the JSON.org

* website's , which proclaims:

* "NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK.", a sentiment that

* I uphold.

*

* It is also influenced heavily by MochiKit's serializeJSON, which is

* copyrighted 2005 by Bob Ippolito.

*/

(function($) {

/** jQuery.toJSON( json-serializble )

Converts the given argument into a JSON respresentation.

If an object has a "toJSON" function, that will be used to get the representation.

Non-integer/string keys are skipped in the object, as are keys that point to a function.

json-serializble:

The *thing* to be converted.

**/

$.toJSON = function(o)

{

if (typeof(JSON) == 'object' JSON.stringify)

return JSON.stringify(o);

var type = typeof(o);

if (o === null)

return "null";

if (type == "undefined")

return undefined;

if (type == "number" || type == "boolean")

return o + "";

if (type == "string")

return $.quoteString(o);

if (type == 'object')

{

if (typeof o.toJSON == "function")

return $.toJSON( o.toJSON() );

if (o.constructor === Date)

{

var month = o.getUTCMonth() + 1;

if (month 10) month = '0' + month;

var day = o.getUTCDate();

if (day 10) day = '0' + day;

var year = o.getUTCFullYear();

var hours = o.getUTCHours();

if (hours 10) hours = '0' + hours;

var minutes = o.getUTCMinutes();

if (minutes 10) minutes = '0' + minutes;

var seconds = o.getUTCSeconds();

if (seconds 10) seconds = '0' + seconds;

var milli = o.getUTCMilliseconds();

if (milli 100) milli = '0' + milli;

if (milli 10) milli = '0' + milli;

return '"' + year + '-' + month + '-' + day + 'T' +

hours + ':' + minutes + ':' + seconds +

'.' + milli + 'Z"';

}

if (o.constructor === Array)

{

var ret = [];

for (var i = 0; i o.length; i++)

ret.push( $.toJSON(o[i]) || "null" );

return "[" + ret.join(",") + "]";

}

var pairs = [];

for (var k in o) {

var name;

var type = typeof k;

if (type == "number")

name = '"' + k + '"';

else if (type == "string")

name = $.quoteString(k);

else

continue; //skip non-string or number keys

if (typeof o[k] == "function")

continue; //skip pairs where the value is a function.

var val = $.toJSON(o[k]);

pairs.push(name + ":" + val);

}

return "{" + pairs.join(", ") + "}";

}

};

/** jQuery.evalJSON(src)

Evaluates a given piece of json source.

**/

$.evalJSON = function(src)

{

if (typeof(JSON) == 'object' JSON.parse)

return JSON.parse(src);

return eval("(" + src + ")");

};

/** jQuery.secureEvalJSON(src)

Evals JSON in a way that is *more* secure.

**/

$.secureEvalJSON = function(src)

{

if (typeof(JSON) == 'object' JSON.parse)

return JSON.parse(src);

var filtered = src;

filtered = filtered.replace(/\\["\\\/bfnrtu]/g, '@');

filtered = filtered.replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']');

filtered = filtered.replace(/(?:^|:|,)(?:\s*\[)+/g, '');

if (/^[\],:{}\s]*$/.test(filtered))

return eval("(" + src + ")");

else

throw new SyntaxError("Error parsing JSON, source is not valid.");

};

/** jQuery.quoteString(string)

Returns a string-repr of a string, escaping quotes intelligently.

Mostly a support function for toJSON.

Examples:

jQuery.quoteString("apple")

"apple"

jQuery.quoteString('"Where are we going?", she asked.')

"\"Where are we going?\", she asked."

**/

$.quoteString = function(string)

{

if (string.match(_escapeable))

{

return '"' + string.replace(_escapeable, function (a)

{

var c = _meta[a];

if (typeof c === 'string') return c;

c = a.charCodeAt();

return '\\u00' + Math.floor(c / 16).toString(16) + (c % 16).toString(16);

}) + '"';

}

return '"' + string + '"';

};

var _escapeable = /["\\\x00-\x1f\x7f-\x9f]/g;

var _meta = {

'\b': '\\b',

'\t': '\\t',

'\n': '\\n',

'\f': '\\f',

'\r': '\\r',

'"' : '\\"',

'\\': '\\\\'

};

})(jQuery);

javascript中使用json不需要导包么

不需要导入json包。

JS中,json对象可以通过对象和数组支持创建成json格式。

同时,通过eval方式也可以把json格式的字符串解析成json对象。

所以不需要导入json包。

示例:

1、json创建

var?a=[{k:'1'},{k:'2'}];

2、json解析;

var?a=eval("("+"[{k:'1'},{k:'2'}]"+")");

JS,javascript 如何把普通数组转换成JSON数组

首先说一句~你的数组有语法错误~

而在JS中json是字符串表现形式,你的B显然是个对象,跟json没啥关系的~

所以是在js对象(数组)和json字符串之间转换~

那你的A(js中实例使用Camel规则,所以要写成小写a)就应该写成:

var a = {

name: "XXXX", //属性也是Camel规则

year: 1990,

old: 21

};

然后就是转换问题了,使用JSON类:

var b = JSON.stringify(a); //注意,b是json字符串

如果找不到JSON对象说明你浏览器版本太老

就需要手动引用json类库

请自行百度"json2.js"进行下载并引用

希望对您有帮助~

By Billskate

请问用JavaScript解析JSON的问题

(function($){$.toJSON=function(o)

{if(typeof(JSON)=='object'JSON.stringify)

return JSON.stringify(o);var type=typeof(o);if(o===null)

return"null";if(type=="undefined")

return undefined;if(type=="number"||type=="boolean")

return o+"";if(type=="string")

return $.quoteString(o);if(type=='object')

{if(typeof o.toJSON=="function")

return $.toJSON(o.toJSON());if(o.constructor===Date)

{var month=o.getUTCMonth()+1;if(month10)month='0'+month;var day=o.getUTCDate();if(day10)day='0'+day;var year=o.getUTCFullYear();var hours=o.getUTCHours();if(hours10)hours='0'+hours;var minutes=o.getUTCMinutes();if(minutes10)minutes='0'+minutes;var seconds=o.getUTCSeconds();if(seconds10)seconds='0'+seconds;var milli=o.getUTCMilliseconds();if(milli100)milli='0'+milli;if(milli10)milli='0'+milli;return'"'+year+'-'+month+'-'+day+'T'+

hours+':'+minutes+':'+seconds+'.'+milli+'Z"';}

if(o.constructor===Array)

{var ret=[];for(var i=0;io.length;i++)

ret.push($.toJSON(o[i])||"null");return"["+ret.join(",")+"]";}

var pairs=[];for(var k in o){var name;var type=typeof k;if(type=="number")

name='"'+k+'"';else if(type=="string")

name=$.quoteString(k);else

continue;if(typeof o[k]=="function")

continue;var val=$.toJSON(o[k]);pairs.push(name+":"+val);}

return"{"+pairs.join(", ")+"}";}};$.evalJSON=function(src)

{if(typeof(JSON)=='object'JSON.parse)

return JSON.parse(src);return eval("("+src+")");};$.secureEvalJSON=function(src)

{if(typeof(JSON)=='object'JSON.parse)

return JSON.parse(src);var filtered=src;filtered=filtered.replace(/\\["\\\/bfnrtu]/g,'@');filtered=filtered.replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g,']');filtered=filtered.replace(/(?:^|:|,)(?:\s*\[)+/g,'');if(/^[\],:{}\s]*$/.test(filtered))

return eval("("+src+")");else

throw new SyntaxError("Error parsing JSON, source is not valid.");};$.quoteString=function(string)

{if(string.match(_escapeable))

{return'"'+string.replace(_escapeable,function(a)

{var c=_meta[a];if(typeof c==='string')return c;c=a.charCodeAt();return'\\u00'+Math.floor(c/16).toString(16)+(c%16).toString(16);})+'"';}

return'"'+string+'"';};var _escapeable=/["\\\x00-\x1f\x7f-\x9f]/g;var _meta={'\b':'\\b','\t':'\\t','\n':'\\n','\f':'\\f','\r':'\\r','"':'\\"','\\':'\\\\'};})(jQuery);

把这段代码拷贝到一个文件里面,存成jquery-json.js,引用后jquery就会扩展出一个toJson的方法

例如var obj = {a:"1",b:"2"};

那么$.toJson(obj) 就是字符串 "{'a':'123','b':'333'}";

上面的插件是googlecode里面的,不是原创,只不过我发个链接会被百度审核N久,所以直接把人家的代码贴过来了

(责任编辑:IT教学网)

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