var height = parseFloat(prompt('请输入身高(m):'));
var weight = parseFloat(prompt('请输入体重(kg):'));
var bmi = weight/(height**2);
console.log(height**2);
console.log(`身高:${height}m,体重:${weight}kg,BMI:${bmi}`);

if(bmi< 18.5){
    console.log('过轻');
}else if(bmi<25){
    console.log('正常');
}else if(bmi<28){
    console.log('过重');
}else if(bmi<32){
    console.log('肥胖');
}else {
    console.log('严重肥胖')
}