扩张jQuery对json字符串的转换

//扩展jQuery对json字符串的转换  
	jQuery.extend({    
		/** * @see 将json字符串转换为对象 * @param json字符串 * @return 返回object,array,string等对象 */    
		evalJSON: function(strJson) {      
			return eval("(" + strJson + ")");    }  });  
	jQuery.extend({    
		/** * @see 将javascript数据类型转换为json字符串 * @param 待转换对象,支持object,array,string,function,number,boolean,regexp * @return 返回json字符串 */    
		toJSON: function(object) {      
			
			var type = typeof object;      
			if ('object' == type) {        
				if (Array == object.constructor) type = 'array';        
				else if (RegExp == object.constructor) type = 'regexp';        
				else type = 'object';      }      
			switch (type) {      
			case 'undefined':      
				case 'unknown':        
					return;        
					break;      
					case 'function':      
					case 'boolean':      
					case 'regexp':        
						return object.toString();        
						break;      
					case 'number':        
						return isFinite(object) ? object.toString() : 'null';        
						break;      
					case 'string':        
						return '"' + 
							object.replace(/(\\|\")/g, "\\$1").replace(/\n|\r|\t/g, 
									function() {          
							var a = arguments[0];          
							return (a == '\n') ? '\\n': (a == '\r') ? '\\r': (a == '\t') ? '\\t': ""  
								}) + '"';        
						break;     
					case 'object':        
						if (object === null) return 'null';        
						var results = [];        
						for (var property in object) {          
							var value = jQuery.toJSON(object[property]);          
							if (value !== undefined) results.push(jQuery.toJSON(property) + ':' + value);        
							}        
						return '{' + results.join(',') + '}';        
						break;      
					case 'array':        
						var results = [];        
						for (var i = 0; i < object.length; i++) {          
							var value = jQuery.toJSON(object[i]);          
							if (value !== undefined) results.push(value);        
						}        
						return '[' + results.join(',') + ']';        
						break;      
					}    
			}  });