数组排序

var arr = [
    {a:'xx',b:10},
    {a:'dd',b:28},
    {a:'cc',b:38}
];

function compare(x){
    return function(a,b){
        var value1 = a[x];
        var value2 = b[x];
        return value1 - value2;
    }
}
console.log(arr.sort(compare('b')))