'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);
alert(bmi);
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');
}