1 <?php
2
3 //php中生成json信息
4 //json_encode(数组/对象)
5
6 $color = array(‘red‘,‘blue‘,‘green‘); //【索引数组】
7 echo json_encode($color),"<br />"; //["red","blue","green"]
8
9 $animal = array(‘east‘=>‘tiger‘,‘north‘=>‘wolf‘,‘south‘=>‘monkey‘); //【关联数组】
10 echo json_encode($animal),"<br />";//{"east":"tiger","north":"wolf","south":"monkey"}
11
12 //【索引关联数组】
13 $animal2 = array(‘east‘=>‘tiger‘,‘north‘=>‘wolf‘,‘duck‘,‘south‘=>‘monkey‘);
14 echo json_encode($animal2),"<br />";//{"east":"tiger","north":"wolf","0":"duck","south":"monkey"}
15
16 //[{},{},{}]
17 //{"weatherinfo":{"city":"北京","cityid":"101010100","temp":"9","WD":"南风","WS":"2级","SD":"26%","WSE":"2","time":"10:20","isRadar":"1","Radar":"JC_RADAR_AZ9010_JB","njd":"暂无实况","qy":"1014"}}
18 //{名称:[],名称:[],名称:[]}
19
20
21 //【对象生成json信息】
22 class Person{
23 public $addr = "beijing";
24 public $height = 170;
25 public function study(){
26 echo "study php";
27 }
28 }
29 $tom = new Person();
30 //只是对象的属性给生成json信息
31 echo json_encode($tom);//{"addr":"beijing","height":170}
1.json
json_encode(数组/对象)------------>生成json信息，
json_decode(json信息); 反编码json信息
对json字符串信息进行反编码，变为当前语言可以识别的信息。
2. javascript接收处理json信息
通过eval()把接收的json字符串变成真实的对象信息
代码如下：
1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
2 <html>
3 <head>
4 <title>新建网页</title>
5 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
6 <meta name="description" content="" />
7 <meta name="keywords" content="" />
8
9 <script type="text/javascript">
10 function showweather(){
11 //利用ajax获得天气预报信息
12 //利用javascript+dom处理并显示天气信息
13 var xhr = new XMLHttpRequest();
14 xhr.onreadystatechange = function(){
15 if(xhr.readyState==4){
16 //alert(xhr.responseText);
17 console.log(typeof xhr.responseText);//string
18 //要把接收的“字符串”变为“对象”
19 //‘{"addr":"\u5317\u4eac","temp":"9-22","wind":"north4-5"}‘
20 eval("var info="+xhr.responseText);
21
22 var str = "地址："+info.addr+";温度:"+info.temp+";风向:"+info.wind;
23 document.getElementById(‘result‘).innerHTML = str;
24 }
25 }
26 xhr.open(‘get‘,‘./03.php‘);
27 xhr.send(null);
28 }
29 window.onload = function(){
30 showweather();
31 }
32
33 // //s字符串变为对象obj
34 // var s = "{name:‘tom‘,height:170}";
35 // //"var obj="+"{name:‘tom‘,height:170}"====>"var obj={name:‘tom‘,height:170}"
36 // //console.log("var obj="+s);
37 // eval("var obj="+s);
38 // console.log(obj);//Object { name="tom", height=170}
39
40 </script>
41
42 <style type="text/css">
43 </style>
44 </head>
45 <body>
46 <h2>获得天气预报接口信息</h2>
47 <div id="result"></div>
48 </body>
49 </html>
时间： 2024-10-26 05:15:47