js对json数组排序

data=["a","z","c","w","j"];    
alert (data.sort( ));  

上面的排序方法可以毫无问题地对数组进行排序，因为它是一个字符串元素数组。

JSON 返回类型是一个对象数组。因此 sort 方法不能直接用于对数组进行排序。但是，我们可以使用comparer 函数作为“sort”方法的参数来实现排序。

function compare(a, b) {    
  if (a is less than b by some ordering criterion) {    
    return -1;    
  }    
  if (a is greater than b by the ordering criterion) {    
    return 1;    
  }    
  // a must be equal to b    
  return 0;    
}  

comparer 函数的返回值基本上标识了后续数组元素的排序顺序。总结如下：

• 如果 ComparingFunction(a, b) < 0，则 a 将被排序到比 b 低的索引。因此a将首先出现。 
• 如果 ComparingFunction (a, b) 返回 0，则 a 和 b 将保留各自的位置。排序顺序不会有任何变化。 
• 如果 ComparingFunction (a, b) > then 0，则 b 将被排序到比 a 更低的索引。因此 b 将首先出现。

var array = [{    
    "EmployeeName": "John",    
    "Experience": "12",    
    "Technology": "SharePoint"    
}, {    
    "EmployeeName": "Charles",    
    "Experience": "9",    
    "Technology": "ASP.NET"    
}, {    
    "EmployeeName": "Jo",    
    "Experience": "3",    
    "Technology": "JAVA"    
}, {    
    "EmployeeName": "Daine",    
    "Experience": "7",    
    "Technology": "Sql Server"    
}, {    
    "EmployeeName": "Zain",    
    "Experience": "6",    
    "Technology": "C#"    
}];    
//Comparer Function    
function GetSortOrder(prop) {    
    return function(a, b) {    
        if (a[prop] > b[prop]) {    
            return 1;    
        } else if (a[prop] < b[prop]) {    
            return -1;    
        }    
        return 0;    
    }    
}    
    
array.sort(GetSortOrder("EmployeeName")); //Pass the attribute to be sorted on    
document.write("Sorted Employee Names : ");    
for (var item in array) {    
    document.write("<br>" + array[item].EmployeeName);    
}    
    
array.sort(GetSortOrder("Technology")); //Pass the attribute to be sorted on    
document.write("<br><br> Sorted Technology Names : ");    
for (var item in array) {    
    document.write("<br>" + array[item].Technology);    
}  

Output 

Sorted Employee Names:

Zain

Sorted Technology Names:

SharePoint

Sql Server

当 AJAX 调用返回 JSON 数组时，此辅助方法会派上用场，该数组必须经过排序并动态绑定到 html DOM 以供最终用户显示。