数组中出现次数超过一半的数字

一：
function MoreThanHalfNum_Solution(numbers) { var obj = {}; var length = numbers.length; numbers.forEach(function(d) { if (obj[d]) { obj[d]++; } else { obj[d] = 1; } }) for (var i in obj) { if (obj[i] > Math.floor(length / 2)) { return i; } } return 0; }
二：

function MoreThanHalfNum(arr) { arr.sort(); if(arr.length%2===0){ console.log(arr[arr.length/2]) }else { console.log(arr[(arr.length-1)/2]) } } var arr=[0,1,2,3,3,3,3]; MoreThanHalfNum(arr); //3