CreateTime--2016年10月12日09:28:09
迁移时间--2017年5月16日10:19:12
Author:Marydon二、javascript-JSON
说明：本文主要讲的是在javascript中对JSON数据的操作，若想看java中如何对JSON对象进行操作，请见数据格式汇总2-java文章
（一）格式介绍
标准格式：
{"键":值,"键":值,"键":值}（值可以是数字，不加双引号；也可以是字符串，需加双引号；值也可以包含一个对象）
格式一：值存储的是多个对象
{"data":[{"TERM":"第一期","WANGWU":199,"LISI":229,"ZHAOLIU":233,"SANQI":234,"ZHANGSAN":233},{"TERM":"第二期","WANGWU":156,"LISI":186,"ZHAOLIU":179,"SANQI":206,"ZHANGSAN":234},{"TERM":"第三期","WANGWU":133,"LISI":161,"ZHAOLIU":246,"SANQI":185,"ZHANGSAN":240},{"TERM":"第四期","WANGWU":194,"LISI":126,"ZHAOLIU":190,"SANQI":207,"ZHANGSAN":229},{"TERM":"第五期","WANGWU":149,"LISI":166,"ZHAOLIU":209,"SANQI":174,"ZHANGSAN":197}],"code":0,"expMsg":"","msg":"操作成功"} 格式二：多个对象组成的数组
var row = '[{"TERM":"第一期","WANGWU":199,"LISI":229,"ZHAOLIU":233,"SANQI":234,"ZHANGSAN":233},{"TERM":"第二期","WANGWU":156,"LISI":186,"ZHAOLIU":179,"SANQI":206,"ZHANGSAN":234},{"TERM":"第三期","WANGWU":133,"LISI":161,"ZHAOLIU":246,"SANQI":185,"ZHANGSAN":240},{"TERM":"第四期","WANGWU":194,"LISI":126,"ZHAOLIU":190,"SANQI":207,"ZHANGSAN":229},{"TERM":"第五期","WANGWU":149,"LISI":166,"ZHAOLIU":209,"SANQI":174,"ZHANGSAN":197}]'; （二）操作JSON
2.2.1 json赋值
在js中，[]表示数组；{}表示Json对象。
以将map形式的字符串转成JSON对象为例举例
方式一：声明JSON对象
/** * 将map形式的字符串转成JSON对象 * @param {string} mapStr * java-Map格式字符串 */function mapstringToJSON (mapStr) { // 1.去除字符串中所有的" mapStr = mapStr.replace(/"/g, ""); // 2.去除掉"{}" mapStr = mapStr.substring(1, mapStr.length - 1); // 3.将map字符串用逗号拆分成数组 var strs = mapStr.split(","); // 声明一个长度为2的数组 var keyValue = new Array(2); // JSON-键 var key = ""; // JSON-值 var value = ""; // 声明一个JSON对象 var json = {}; // 4.迭代map键值对 $(strs).each(function(index, str) { keyValue = str.split("=");//按等号拆分成数组 key = $.trim(keyValue[0]); value = $.trim(keyValue[1]); json[key] = value;// 动态值 //json.key死值 }); return json;}var mapString = "{home=index, ForganizeCode=0, theme=window7, userAreaId=215, userManOrgs=10}";var jsonObj = mapstringToJSON(mapString);for (var key in jsonObj) { console.log(jsonObj[key]);} 注意：说说JSON对象中的"."与"[]"操作符的区别：
上面的key是动态的值，若用点操作，即json.key，其结果就是json对象中有且只有一个键：key，其他的键都没有加上；
赋值上：点操作指定的是死键，[]操作既可用作表示死键，又可用作表示动态的键。
取值上：没太大区别。
方式二：字符串拼接
/** * 将map形式的字符串转成JSON对象 * @param {string} mapStr * java-Map格式字符串 */function mapstringToJSON (mapStr) { // 1.去除字符串中所有的" mapStr = mapStr.replace(/"/g, ""); // 2.去除掉"{}" mapStr = mapStr.substring(1, mapStr.length - 1); // 3.将map字符串用逗号拆分成数组 var strs = mapStr.split(","); //JSON字符串 var jsonStr = ""; //声明一个长度为2的数组 var keyValue = new Array(2); //JSON-键 var key = ""; //JSON-值 var value = ""; // 4.迭代map键值对 $(strs).each(function(index, str) { keyValue = str.split("=");//按等号拆分成数组 key = '"' + keyValue[0].trim() + '"'; value = '"' + keyValue[1].trim() + '"'; jsonStr += key + ":" + value + ",";//标准的JSON拼接格式 }); // 5.去除最后一个逗号并拼接"{}" jsonStr = "{" + jsonStr.substring(0, jsonStr.length - 1) + "}"; // 6.json字符串转成JSON对象 var json = eval('(' + jsonStr + ')'); return json;}var mapString = "{home=index, ForganizeCode=0, theme=window7, userAreaId=215, userManOrgs=10}";var jsonObj = mapstringToJSON(mapString);for (var key in jsonObj) { console.log(jsonObj[key]);} 注意：
JSON字符串拼接原则：
1.键必须有双引号，不能是单引号；
2.键值对之间用逗号隔开；
3.键与值之间使用冒号。
2.2.2 json格式取值
UpdateTime--2016年10月25日11:37:09
2.2.2.1 json格式的字符串取值
数据格式
var jsonStr = '{"data":[{"FSTATE":"1","FRCODE":"410000","FZJM":"YFBJK","ROWNO":"1","FREMARK":"","FDEPTNAME":"预防保健科","FPLVCODE":"","FDEPTCODE":"01"},{"FSTATE":"1","FRCODE":"410000","FZJM":"QKYLK","ROWNO":"2","FREMARK":"","FDEPTNAME":"全科医疗科","FPLVCODE":"","FDEPTCODE":"02"},{"FSTATE":"1","FRCODE":"410000","FZJM":"NK","ROWNO":"3","FREMARK":"","FDEPTNAME":"内科","FPLVCODE":"","FDEPTCODE":"03"},{"FSTATE":"1","FRCODE":"410000","FZJM":"WK","ROWNO":"4","FREMARK":"","FDEPTNAME":"外科","FPLVCODE":"","FDEPTCODE":"04"},{"FSTATE":"1","FRCODE":"410000","FZJM":"FCK","ROWNO":"5","FREMARK":"","FDEPTNAME":"妇产科","FPLVCODE":"","FDEPTCODE":"05"}],"code":0,"msg":"操作成功！","expMsg":""}'; 取值方法
//取对象var jsonObj = eval('('+jsonStr+')');console.log(jsonObj.msg);//取数组元素var jsonObj = eval('('+jsonStr+')');var jsonObj2 = jsonObj.data;for (var i = 0; i 2.2.2.2 json格式取值
数据格式
var jsonStr = {"data":[{"FSTATE":"1","FRCODE":"410000","FZJM":"YFBJK","ROWNO":"1","FREMARK":"","FDEPTNAME":"预防保健科","FPLVCODE":"","FDEPTCODE":"01"},{"FSTATE":"1","FRCODE":"410000","FZJM":"QKYLK","ROWNO":"2","FREMARK":"","FDEPTNAME":"全科医疗科","FPLVCODE":"","FDEPTCODE":"02"},{"FSTATE":"1","FRCODE":"410000","FZJM":"NK","ROWNO":"3","FREMARK":"","FDEPTNAME":"内科","FPLVCODE":"","FDEPTCODE":"03"},{"FSTATE":"1","FRCODE":"410000","FZJM":"WK","ROWNO":"4","FREMARK":"","FDEPTNAME":"外科","FPLVCODE":"","FDEPTCODE":"04"},{"FSTATE":"1","FRCODE":"410000","FZJM":"FCK","ROWNO":"5","FREMARK":"","FDEPTNAME":"妇产科","FPLVCODE":"","FDEPTCODE":"05"}],"code":0,"msg":"操作成功！","expMsg":""}; 取值方法
//取对象console.log(jsonStr.msg);//取数组元素var jsonObj2 = jsonStr.data;for (var i = 0; i
2.2.2.3 json数组字符串格式的取值
数据格式
var jsonStr = '[{"FSTATE":"1","FRCODE":"410000","FZJM":"YFBJK","ROWNO":"1","FREMARK":"","FDEPTNAME":"预防保健科","FPLVCODE":"","FDEPTCODE":"01"},{"FSTATE":"1","FRCODE":"410000","FZJM":"QKYLK","ROWNO":"2","FREMARK":"","FDEPTNAME":"全科医疗科","FPLVCODE":"","FDEPTCODE":"02"},{"FSTATE":"1","FRCODE":"410000","FZJM":"NK","ROWNO":"3","FREMARK":"","FDEPTNAME":"内科","FPLVCODE":"","FDEPTCODE":"03"},{"FSTATE":"1","FRCODE":"410000","FZJM":"WK","ROWNO":"4","FREMARK":"","FDEPTNAME":"外科","FPLVCODE":"","FDEPTCODE":"04"},{"FSTATE":"1","FRCODE":"410000","FZJM":"FCK","ROWNO":"5","FREMARK":"","FDEPTNAME":"妇产科","FPLVCODE":"","FDEPTCODE":"05"}]'; 取值方法
//取数组元素var jsonObj = eval('('+jsonStr+')');for (var i = 0; i 2.2.2.4 json格式数组的取值
数据格式
var jsonObj = [{"FSTATE":"1","FRCODE":"410000","FZJM":"YFBJK","ROWNO":"1","FREMARK":"","FDEPTNAME":"预防保健科","FPLVCODE":"","FDEPTCODE":"01"},{"FSTATE":"1","FRCODE":"410000","FZJM":"QKYLK","ROWNO":"2","FREMARK":"","FDEPTNAME":"全科医疗科","FPLVCODE":"","FDEPTCODE":"02"},{"FSTATE":"1","FRCODE":"410000","FZJM":"NK","ROWNO":"3","FREMARK":"","FDEPTNAME":"内科","FPLVCODE":"","FDEPTCODE":"03"},{"FSTATE":"1","FRCODE":"410000","FZJM":"WK","ROWNO":"4","FREMARK":"","FDEPTNAME":"外科","FPLVCODE":"","FDEPTCODE":"04"},{"FSTATE":"1","FRCODE":"410000","FZJM":"FCK","ROWNO":"5","FREMARK":"","FDEPTNAME":"妇产科","FPLVCODE":"","FDEPTCODE":"05"}]; 取值方法
//取数组元素for (var i = 0; i
2.2.2.5 判断JSON对象是否为空
jQuery.isEmptyObject(JSONObj)
（三）格式转换
3.3.1 json格式字符串与JSON对象的相互转化
3.3.1.1 json格式字符串转换成JSON对象
方法：使用eval('(' + 字符串 + ')')
json格式字符串转换成object类型的数组（为了便于理解，可以看成java中的JSONArray）
var jsonArray = eval("("+row+")");console.log(jsonArray);//"[object Object],[object Object],[object Object],[object Object],[object Object]" 3.3.1.2 object类型（java中的JSONArray）转化成json字符串
方法：使用JSON.stringify()
var str = JSON.stringify(jsonArray);console.log(str);//"[{"TERM":"第一期","WANGWU":199,"LISI":229,"ZHAOLIU":233,"SANQI":234,"ZHANGSAN":233},{"TERM":"第二期","WANGWU":156,"LISI":186,"ZHAOLIU":179,"SANQI":206,"ZHANGSAN":234},{"TERM":"第三期","WANGWU":133,"LISI":161,"ZHAOLIU":246,"SANQI":185,"ZHANGSAN":240},{"TERM":"第四期","WANGWU":194,"LISI":126,"ZHAOLIU":190,"SANQI":207,"ZHANGSAN":229},{"TERM":"第五期","WANGWU":149,"LISI":166,"ZHAOLIU":209,"SANQI":174,"ZHANGSAN":197}]" 3.3.2 JSON对象转换成map字符串
/** * 将JSON对象转换成map形式的字符串 * @param {Object} jsonObj * JSON对象 */function JSONToMapstring (jsonObj) { var mapString = ""; //遍历JSON对象 for (var item in jsonObj) { mapString += item + "=" + jsonObj[item] + ",";//标准的java—Map字符串拼接格式 } //去除最后一个逗号并转成map形式字符串 mapString = "{" + mapString.substring(0, mapString.length - 1) + "}"; return mapString;} 举例：
//接着上面的例子var result = JSONToMapstring(jsonObj);console.log(result);//"{home=index,ForganizeCode=0,theme=window7,userAreaId=215,userManOrgs=10}"