(function () {
    'use strict';
    var str = 'how many times how many they are total',
        ary = [],
        obj = {};
    ary = str.split(' ');
    ary.forEach(function (index) {
        console.log(ary[index]);
        if (!obj[index])obj[index]=0 ;
        obj[index] += 1;
    });
    alert(JSON.stringify(obj));
}());

//2.
function compare(a, b) {
  if(a.id<b.id) return -1;
  if(a.id>b.id) return 1;
  return 0;
}
var ary = [ {id:1, name:'n1'}, {id:3, name:'n3'}, {id:4, name:'n4'}, {id:2, name:'n2'} ];
console.log(JSON.stringify(ary.sort(compare)));

//3.
function isTwoAParam() {
   for(var i=0, len=arguments.length; i < len; i=i+1) {
       if(arguments[i] === 2) return true;
   }
   return false;
}