'use strict';

var height = parseFloat(prompt('请输入身高(m):'));
var weight = parseFloat(prompt('请输入体重(kg):'));

var bmi = weight/(height*height);

if (bmi>32){
    alert("严重肥胖")
}else if(bmi>28){
    alert("肥胖")
}else if(bmi>25){
    alert("过重")
}else if(bmi>18.5){
    alert("正常")
}else{
    alert("过轻")
}