Json 的介绍:
JSON 可以将 JavaScript 对象中表示的一组数据转换为字符串,然后就可以在函数之间轻松地传递这个字符串,或者在异步应用程序中将字符串从 Web 客户机传递给服务器端程序。
按照最简单的形式,可以用下面这样的 JSON 表示名称/值对:
{ "firstName": "Brett" }
这样的键/值对也可以是多个:
{"name":"aaa","sex":"男","age":"20"}
从语法方面来看,这与名称/值对相比并没有很大的优势,但是在这种情况下 JSON 更容易使用,而且可读性更好。
值的数组
当需要表示一组值时,JSON 不但能够提高可读性,而且可以减少复杂性。
如果使用 JSON,就只需将多个带花括号的记录分组在一起:
{ "people": [
{ "firstName": "Brett","lastName":"McLaughlin","email": "111111" },
{ "firstName": "Jason","lastName":"Hunter","email": "22222" },
{ "firstName": "Elliotte","lastName":"Harold","email": "33333" }
]}
可以使用相同的语法表示多个值(每个值包含多个记录):
{ "programmers": [
{ "firstName": "Brett","email": "3333" },"email": "1222" },"email": "3333" }
],
"authors": [
{ "firstName": "Isaac","lastName": "Asimov","genre": "science fiction" },
{ "firstName": "Tad","lastName": "Williams","genre": "fantasy" },
{ "firstName": "Frank","lastName": "Peretti","genre": "christian fiction" }
],
"musicians": [
{ "firstName": "Eric","lastName": "Clapton","instrument": "guitar" },
{ "firstName": "Sergei","lastName": "Rachmaninoff","instrument": "piano" }
]
}
Json也可以这样写:
{ "listaccountsresponse" : { "count":1,"account" : [ {"id":5,"name":"xian1","accounttype":0,"domainid"
:2,"domain":"Server","receivedbytes":649444,"sentbytes":175467975,"vmlimit":"20","vmtotal":2,"vmavailable"
:"18","iplimit":"20","iptotal":1,"ipavailable":"19","volumelimit":"20","volumetotal":2,"volumeavailable"
:0,"templateavailable":"20","vmstopped":0,"vmrunning":2,"state":"enabled","user":[{"id":5,"username"
:"xian1","firstname":"Eric","lastname":"Tang","email":"Wang-Ngai.Tang@pccw.com","created":"2012-03-22T09
:36:44+0800","account":"xian1","domainid":2,"timezone"
:"Asia/Shanghai"}]} ] } }
ajax对Json格式数据的解析:
1.对简单json格式的解析:
{ "firstName": "Brett" }
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