求数组中位数
function findMedian(Array s){
var n = s.length
var median
if(n % 2){
median = s[n/2];
}else{
median = (s[n/2] + s[n/2 -1])/2
}
}
function findMedian(Array s){
var n = s.length
var median
if(n % 2){
median = s[n/2];
}else{
median = (s[n/2] + s[n/2 -1])/2
}
}