JSON相关

//转换

一个JSON数据类型的字付串，然后在JavaScript脚本中用eval()函数改变成JSON对象，就可以直接访问了。感觉这样比较方便，也更灵活一点。要注意的是要在返回的字符串两端加一对小括号：

var json1 = web_TreeView_TreeDemo.GetJson().value;

    json1 = eval('(' + json1 + ')');

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1. function showJSON()      
2. {          
3. var user =           
4.      {           
5. "username":"andy",          
6. "age":20,          
7. "info": { "tel": "123456", "cellphone": "98765"},          
8. "address":          
9.              [          
10.                  {"city":"beijing","postcode":"222333"},          
11.                  {"city":"newyork","postcode":"555666"}          
12.              ]          
13.      }          
15.      alert(user.username);          
16.      alert(user.age);          
17.      alert(user.info.cellphone);          
18.      alert(user.address[0].city);          
19.      alert(user.address[0].postcode);        
20.      user.username = "Tom";          
21.      alert(user.username);          
23. }  

function showJSON()   
 {       
    var user =        
    {        
        "username":"andy",       
        "age":20,       
        "info": { "tel": "123456", "cellphone": "98765"},       
        "address":       
            [       
                {"city":"beijing","postcode":"222333"},       
                {"city":"newyork","postcode":"555666"}       
            ]       
    }       
           
    alert(user.username);       
    alert(user.age);       
    alert(user.info.cellphone);       
    alert(user.address[0].city);       
    alert(user.address[0].postcode);     
    user.username = "Tom";       
    alert(user.username);       
     
}

将字符串转 －> json 对象：

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1. //使用eval函数将字符串转化成json对象          
2. function myEval()       
3.     {             
4. var str = '{ "name": "Violet", "occupation": "character" }';             
5. var obj = eval('(' + str + ')');            
7.     alert(obj.toJSONString());             
8.     }    

//使用eval函数将字符串转化成json对象          
   function myEval()    
   {          
   var str = '{ "name": "Violet", "occupation": "character" }';          
   var obj = eval('(' + str + ')');         
     
   alert(obj.toJSONString());          
   }

查看复制到剪切板打印

1. //使用 json.js 中的parseJSON方法   
2. function myEval2() {             
3. var str = '{ "name": "Violet", "occupation": "character" }';             
4. var obj = str.parseJSON();             
5.     alert(obj.toJSONString());    

//使用 json.js 中的parseJSON方法   
   function myEval2() {          
   var str = '{ "name": "Violet", "occupation": "character" }';          
   var obj = str.parseJSON();          
   alert(obj.toJSONString());

将 json 对象 －> 字符串转 ：

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1. function showCar() {          
2. var carr = new Car("Dodge", "Coronet R/T", 1968, "yellow");          
3.      alert(carr.toJSONString());          
4. }          
6. function Car(make, model, year, color)        {          
7. this.make   =   make;          
8. this.model   =   model;          
9. this.year   =   year;          
10. this.color   =   color;          
11. }     

function showCar() {       
    var carr = new Car("Dodge", "Coronet R/T", 1968, "yellow");       
    alert(carr.toJSONString());       
}       
      
function Car(make, model, year, color)       {       
     this.make  =  make;       
     this.model  =  model;       
     this.year  =  year;       
     this.color  =  color;       
}

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1. function test()      
2.    {       
3. var myJSONtext =       
4.          {         
5. "bindings":       
6.              [         
7.                  {"ircEvent": "PRIVMSG", "method": "newURI", "regex": "^http://.*"},         
8.                  {"ircEvent": "PRIVMSG", "method": "deleteURI", "regex": "^delete.*"},         
9.                  {"ircEvent": "PRIVMSG", "method": "randomURI", "regex": "^random.*"}         
10.              ]         
11.          };         
12. var myObject = eval(myJSONtext);         
13.          alert("对象长度："+myObject.bindings.length);         
14. for(var i=0;i<myObject.bindings.length;i++){         
15.              alert(myObject.bindings[i].method);         
16.          }        
17.    }