简明现代魔法 -> JavaScript -> 与 JSON 相关的部分程序代码收集

与 JSON 相关的部分程序代码收集

2010-02-01

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 + ')');  

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：

//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());          
}  

//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 ：

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;       
}  

function test()      
{       
	var myJSONtext =       
    {         
		"bindings":       
        [         
        	{"ircEvent": "PRIVMSG", "method": "newURI", "regex": "^http://.*"},         
          	{"ircEvent": "PRIVMSG", "method": "deleteURI", "regex": "^delete.*"},         
            {"ircEvent": "PRIVMSG", "method": "randomURI", "regex": "^random.*"}         
        ]         
	};         
	var myObject = eval(myJSONtext);         
		alert("对象长度："+myObject.bindings.length);         
	for(var i=0;i<myObject.bindings.length;i++)
    {         
    	alert(myObject.bindings[i].method);         
    }        
}