json2.js的初步学习与了解（转）
轉(zhuǎn)載來源：http://apps.hi.baidu.com/share/detail/6092406
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json2.js的初步學(xué)習(xí)與了解
1.）該js的下載地址是：http://www.json.org/json2.js
2.）在頁面中引用該腳本：<script type="text/javascript" src="js/json2.js"></script>
3.）示例演示一：
//直接聲明json數(shù)據(jù)結(jié)構(gòu)
var myJSONObject = {"bindings": [
??????? {"ircEvent": "PRIVMSG", "method": "newURI", "regex": "^http://.*"},
??????? {"ircEvent": "PRIVMSG", "method": "deleteURI", "regex": "^delete.*"},
??????? {"ircEvent": "PRIVMSG", "method": "randomURI", "regex": "^random.*"}
??? ]
};
這個(gè)例子中，創(chuàng)建了一個(gè)對(duì)象，它只包含一個(gè)成員“bindings”。“bindings”是一個(gè)包含了3個(gè)對(duì)象的數(shù)組，而這每個(gè)對(duì)象都有"ircEvent"、"method"和"regex"3個(gè)成員。
這些成員可以用“.”或subscript 操作得到。
如：myJSONObject.bindings[0].method??? // "newURI"
??? myJSONObject.bindings[1].deleteURI??? // "newURI"
???
//聲明字符串,可對(duì)比一下json文本與我們正常文本的區(qū)別
var normalstring='[{persons:[{name:"jordan",sex:"m",age:"40"}, {name:"bryant",sex:"m",age:"28"}, {name:"McGrady",sex:"m",age:"27"} ]}]';
var jsontext='[{"persons":[{"name":"jordan","sex":"m","age":"40"}, {"name":"bryant","sex":"m","age":"28"}, {"name":"McGrady","sex":"m","age":"27"} ]}]';
我們可以使用eval()函數(shù)調(diào)用JavaScript的編譯器把JSON文本轉(zhuǎn)變成對(duì)象。因?yàn)镴SON是JavaScript的一個(gè)確切的子集，編譯器可以正確地解析JSON文本，然后生成一個(gè)對(duì)象結(jié)構(gòu)。
//調(diào)用eval函數(shù)轉(zhuǎn)換為json對(duì)象，
var myE = eval(normalstring);
//將json對(duì)象轉(zhuǎn)換為字符串
var text = JSON.stringify(myE);
//對(duì)比轉(zhuǎn)換后的json文本與聲明的文本區(qū)別
document.writeln('轉(zhuǎn)換后的json文本：'+text+'<br><br>聲明的json格式文本 '+jsontext+'<br><br>聲明的普通格式文本 '+normalstring+'<br><br>');
結(jié)果如下：
轉(zhuǎn)換后的json文本：[{"persons":[{"name":"jordan","sex":"m","age":"40"},{"name":"bryant","sex":"m","age":"28"},{"name":"McGrady","sex":"m","age":"27"}]}]
聲明的json格式文本 [{"persons":[{"name":"jordan","sex":"m","age":"40"},{"name":"bryant","sex":"m","age":"28"},{"name":"McGrady","sex":"m","age":"27"}]}]
聲明的普通格式文本 [{persons:[{name:"jordan",sex:"m",age:"40"}, {name:"bryant",sex:"m",age:"28"}, {name:"McGrady",sex:"m",age:"27"} ]}]
小結(jié)：轉(zhuǎn)換后的json文本和聲明的json格式文本內(nèi)容是相同的。
//當(dāng)安全比較重要的時(shí)候使用JSON解析就好一些。JSON解析只會(huì)識(shí)別JSON文本并且它更安全,下面調(diào)用json的parse函數(shù)對(duì)文本數(shù)據(jù)轉(zhuǎn)換生成json數(shù)據(jù)結(jié)構(gòu)
var myData = JSON.parse(jsontext);
完整的文件如下(區(qū)別：myJSONObject,jsontext,normalstring的不同)：
<%@ page language="java" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
?? <script type="text/javascript" src="js/json2.js"></script>
</head>
<body>
?? <script>
??? var normalstring='[{persons:[{name:"jordan",sex:"m",age:"40"}, {name:"bryant",sex:"m",age:"28"}, {name:"McGrady",sex:"m",age:"27"} ]}]';
??? var jsontext='[{"persons":[{"name":"jordan","sex":"m","age":"40"}, {"name":"bryant","sex":"m","age":"28"}, {"name":"McGrady","sex":"m","age":"27"} ]}]';
??? var myJSONObject = {"bindings": [
????????? {"ircEvent": "PRIVMSG", "method": "newURI", "regex": "^http://.*"},
????????? {"ircEvent": "PRIVMSG", "method": "deleteURI", "regex": "^delete.*"},
????????? {"ircEvent": "PRIVMSG", "method": "randomURI", "regex": "^random.*"}
?????? ]
??? };
???
??? //調(diào)用eval函數(shù)轉(zhuǎn)換為json對(duì)象，
??? var myE = eval(normalstring);
???
??? //將json對(duì)象轉(zhuǎn)換為字符串
??? var text = JSON.stringify(myE);
???
??? //對(duì)比轉(zhuǎn)換后的json文本與聲明的文本區(qū)別
??? document.writeln('轉(zhuǎn)換后的json文本：'+text+'<br><br>聲明的json格式文本 '+jsontext+'<br><br>聲明的普通格式文本 '+normalstring+'<br><br>');
??
??? //JSON解析
??? var myData = JSON.parse(jsontext);
?? </script>
</body>
</html>
4.）示例演示二：
//下面是對(duì)json對(duì)象的增刪查改操作
<%@ page language="java" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
?? <script type="text/javascript" src="js/json2.js"></script>
</head>
<body>
?? <script>
??? //聲明json對(duì)象
??? var jsonObj2={persons:[
???? {name:"jordan",sex:"m",age:"40"},
???? {name:"bryant",sex:"m",age:"28"},
???? {name:"McGrady",sex:"m",age:"27"}
??? ]};
??? var persons=jsonObj2.persons;
??? var str="";
??? var person={name:"yaoMing",sex:"m",age:"26"};
???
??? //以下為json對(duì)象的操作，去掉注釋可以查看操作結(jié)果
??? jsonObj2.persons.push(person);//數(shù)組最后加一條記錄
??? jsonObj2.persons.pop();//刪除最后一項(xiàng)
??? jsonObj2.persons.shift();//刪除第一項(xiàng)
??? jsonObj2.persons.unshift(person);//數(shù)組最前面加一條記錄 只要適合Javascript的方法都是可以用在JSON對(duì)象的數(shù)組中的！所以還有另外的方法splice( )進(jìn)行crud操作！ //刪除
??? jsonObj2.persons.splice(0,2);//開始位置,刪除個(gè)數(shù)
???
??? //替換不刪除
??? var self={name:"tom",sex:"m",age:"24"};
??? var brother={name:"Mike",sex:"m",age:"29"};
??? jsonObj2.persons.splice(1,0,self,brother,self);//開始位置,刪除個(gè)數(shù),插入對(duì)象
???
??? //替換并刪除
??? jsonObj2.persons.splice(0,1,self,brother);//開始位置,刪除個(gè)數(shù),插入對(duì)象
???
??? for(var i=0;i<persons.length;i++){
???? var cur_person=persons[i];
???? str+=cur_person.name+"'sex is "+cur_person.sex+" and age is "+cur_person.age+"<br><br>";
??? }
??? document.writeln(str);
??? //轉(zhuǎn)換為json文本
??? var myjsonobj = JSON.stringify(jsonObj2);
??? document.writeln(myjsonobj);
??? document.writeln(persons.length);
?? </script>
</body>
</html>
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轉(zhuǎn)載于:https://www.cnblogs.com/beijia/archive/2011/10/05/json2.html
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