求一个JS数组重新排序的算法

Question

 $scope.testArr = [      {id:"1",name:"yi"},      {id:"2",name:"er"},      {id:"3",name:"san"},      {id:"4",name:"si"}     ]  <div class="list">      <div ng-repeat="item in testArr" ng-click="foward(item)">{{item.name}}</div>   </div>问题：根据首次点击选中的项 重新生成数组 当前选中的项为数组的第一个元素，依次类推例如首次点击的是id为2的项 则新数组为:[{id:"2",name:"er"},{id:"3",name:"san"}, {id:"4",name:"si"}, {id:"1",name:"yi"}]首次选中的是id为3的项 新数组为[{id:"3",name:"san"}, {id:"4",name:"si"},{id:"1",name:"yi"}{id:"2",name:"er"}]

Answer 1

function reSort(arr,index){
    index = index || 0;    if( !arr || arr.length === 0 || index > arr.length ) return arr;    var front = arr.slice(0,index);    var end = arr.slice(index);    return end.concat(front);
}var arr =  [
     {id:"1",name:"yi"},
     {id:"2",name:"er"},
     {id:"3",name:"san"},
     {id:"4",name:"si"}
    ];

reSort(arr,1);