var average = function(salary) {
let mix = salary[0]
let max = salary[0]
let sum = 0
if ( salary.length >= 3 ) {
for(let i = 0 ; i<salary.length; i++) {
sum += salary[i]
if(salary[i] > max) {
max = salary[i]
}
if(salary[i]< mix){
mix = salary[i]
}
}
return (sum-max-mix) / (salary.length-2)
}else {
return 0
}
}
console.log('这是',average([3,5,7]))