Array.prototype.OrderByAsc = function (func) {
var m = {};
for (var i = 0; i < this.length; i++) {
for (var k = 0; k < this.length; k++) {
if (func(this[i]) < func(this[k])) {
m = this[k];
this[k] = this[i];
this[i] = m;
}
}
}
return this;
}
Array.prototype.OrderByDesc = function (func) {
var m = {};
for (var i = 0; i < this.length; i++) {
for (var k = 0; k < this.length; k++) {
if (func(this[i]) > func(this[k])) {
m = this[k];
this[k] = this[i];
this[i] = m;
}
}
}
return this;
}

var arr = [{ name: 'aaa', grade: 20 }, { name: 'ccc', grade: 30 }, { name: 'bbb', grade: 40 }];
var orderArr = arr.OrderByDesc(function (a) {
return a.grade;
});

for (var i = 0; i < orderArr.length; i++) {
document.write(orderArr[i].name);
}