一个插件

jQuery.extend({  
   toJSON: function(object) { 
     var type = typeof object; 
     if ('object' == type) { 
	   if(object){
	   		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; 
     } 
   } 
});

 /**
             * 针对某一用户保存权限
             *    1,2,3,4,5
             */
            savePrivilege: function(){
				var checkedNodes = privilege.pFunction.privilegeTree.zTree.getCheckedNodes(true);//所有选择的权限
				var mids = "";
				for(var i=0;i<checkedNodes.length;i++){
					if(i<checkedNodes.length-1){
						mids = mids+checkedNodes[i].mid+",";	
					}else{
						mids = mids+checkedNodes[i].mid;
					}
				}
				var parameter = {
					uid:privilege.data.user.uid,mids:mids,checkedNodes  //mids是一样的
				};
            	$.post("privilegeAction_savePrivilege.action",parameter,function(data){
					
				});
            },