js 二维数组匹配另外一个数组的值

Question

有一个二维数组和一个一维数组，根据一维数组提供的值，找到对应二维数组中的元素二维数组 数字是编号[  ["1","商务"]，  ["2","健身"]，  ["3","游泳"],  ["4","餐饮"],  ["5","休闲"]，  ["6","住宿"]][1,3,5]对应 ["1","商务"]  ["3","游泳"] ["5","休闲"]

Answer 1

Array.prototype.myFilter=function(ary){

  return this.filter(function(item){

     return  ary.indexOf(Number(item[0]))!=-1;

  })

}

var a=[

  ["1","商务"],

  ["2","健身"],

  ["3","游泳"],

  ["4","餐饮"],

  ["5","休闲"],

  ["6","住宿"]

];

    var b=[1,3,5];

    console.log(a.myFilter(b))