json数组添加数据java 向json数组中添加数据

一，添加和删除

1，一维数组

test = {}; //空json对像 
 test[‘firstname’] = “tank”; //添加二个元素 
 test[‘lastname’] = “zhang”; 
 console.log(test); //查看 delete test[‘lastname’]; //删除json中的某个元素 
 console.log(test);

2，二维数组

test1 = [{“name”:”tank”,”total”:”100”},{“name”:”zhang”,”total”:”23”},{“name”:”hao”,”total”:”325”}]; 
 add = {“name”:”may”}; test1.push(add); //添加一个元素 
 console.log(test1); delete test1[2]; //删除一个元素 
 console.log(test1); test1.splice(index,1); //test里是一个list index是数据的位置

二，排序

1，一维数组

test = [“100”,”23”,”325”]; //定义个数组 
function sortNumber(a,b) //定义排序方法 
 { 
 return a - b 
 } test1_sort=test.sort(sortNumber); 
console.log(test1_sort);

2，二维数组

test1 = [{"name":"tank","total":"100"},{"name":"zhang","total":"23"},{"name":"hao","total":"325"}];  

sort_by = function(field, reverse, primer){         //定义排序方法  

   var key = primer ?  
       function(x) {return primer(x[field])} :  
       function(x) {return x[field]};  

   reverse = [-1, 1][+!!reverse];  

   return function (a, b) {  
       return a = key(a), b = key(b), reverse * ((a > b) - (b > a));  
     }   

}  

test1_sort=test1.sort(sort_by('total', true, parseInt));    //根据total，升序排  
console.log(test1_sort);   

test1_sort=test1.sort(sort_by('name', false, ''));          //根据name，倒序排  
console.log(test1_sort);