JSON排序

//排序之前
var arrs=[{"PageID":"1"},{"PageID":"10"},{"PageID":"2"},{"PageID":"3"},{"PageID":"4"},{"PageID":"5"},{"PageID":"6"},{"PageID":"7"},{"PageID":"8"},{"PageID":"9"}]

//由小到大排序    
function down(x,y){
    return x.PageID - y.PageID;
}
//由大到小排序
function up(x,y){
    return y.PageID - x.PageID;
}

//排序之后
arrs.sort(down);
//[{"PageID":"1"},{"PageID":"2"},{"PageID":"3"},{"PageID":"4"},{"PageID":"5"},{"PageID":"6"},{"PageID":"7"},{"PageID":"8"},{"PageID":"9"},{"PageID":"10"}]
arrs.sort(up);
//[{"PageID":"10"},{"PageID":"9"},{"PageID":"8"},{"PageID":"7"},{"PageID":"6"},{"PageID":"5"},{"PageID":"4"},{"PageID":"3"},{"PageID":"2"},{"PageID":"1"}]