关于json对象的删除

摘自 http://www.cnblogs.com/wuyifu/p/3424621.html

一个json对象在后台产生了，但是有些数据可能无效或者不合法，所以需要在前台作些例外处理，比如删除掉。

json的删除有很多种，直接用过 delete json对象方式。

举例如下
Js代码
var columns = [
      {name:"bigTitle",caption:reportData.bigTitle,children:[
    {name:"orgName",caption:"组织结构名称",100,mode:"string"},
    {name:"helpinfo",caption:reportData.columnCaption[0],
     children:[{name:"workday_month",caption:"工作日数",80,mode:"number",format:"#"},
               {name:"loggedday_month",caption:"登录天数",80,mode:"number",format:"#"}]
    },
    {name:"helpinfo",caption:reportData.columnCaption[1],
     children:[{name:"workday_week1",caption:"工作日数",70,mode:"number",format:"#"},
               {name:"loggedday_week1",caption:"登录天数",70,mode:"number",format:"#"}]
    },
    {name:"helpinfo",caption:reportData.columnCaption[2],
     children:[{name:"workday_week2",caption:"工作日数",70,mode:"number",format:"#"},
               {name:"loggedday_week2",caption:"登录天数",70,mode:"number",format:"#"}]
    },
    {name:"helpinfo",caption:reportData.columnCaption[3],
     children:[{name:"workday_week3",caption:"工作日数",70,mode:"number",format:"#"},
               {name:"loggedday_week3",caption:"登录天数",70,mode:"number",format:"#"}]
    },
    {name:"helpinfo",caption:reportData.columnCaption[4],
     children:[{name:"workday_week4",caption:"工作日数",70,mode:"number",format:"#"},
               {name:"loggedday_week4",caption:"登录天数",70,mode:"number",format:"#"}]
    },
    {name:"helpinfo",caption:reportData.columnCaption[5],
     children:[{name:"workday_week5",caption:"工作日数",70,mode:"number",format:"#"},
               {name:"loggedday_week5",caption:"登录天数",70,mode:"number",format:"#"}]
    }
      ]}
     ];

根据rtData.columnCaption 判断，如果为null，则删除该节点，不予显示。

用过 delete columns[0]['children'][6];

无效，报js错误，后来发现删除确实是删除了，但是最后还遗留了一个逗号，导致IE下报错，查了很多资料无解。

最后换了个解决方法。

columns[0]['children'].pop();

pop()方法表示删除最后一个节点。

工作日历的要求正好满足该要求，从后递减。

其他类似的方法有如下：
var person={name:"yaoMing",sex:"m",age:"26"};
jsonObj2.persons.push(person);//数组最后加一条记录
jsonObj2.persons.pop();//删除最后一项
jsonObj2.persons.shift();//删除第一项
jsonObj2.persons.unshift(person);//数组最前面加一条记录
只要适合Javascript的方法都是可以用在JSON对象的数组中的！所以还有另外的方法splice( )进行crud操作！
//删除
jsonObj2.persons.splice(0,1);//开始位置,删除个数
//替换不删除
var self={name:"tom",sex:"m",age:"24"};
var brother={name:"Mike",sex:"m",age:"29"};
jsonObj2.persons.splice(1,0,self,brother);//开始位置,删除个数,插入对象
//替换并删除
var self={name:"tom",sex:"m",age:"24"};
var brother={name:"Mike",sex:"m",age:"29"};
jsonObj2.persons.splice(0,1,self,brother);//开始位置,删除个数,插入对象