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());          

   }

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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.    }