var bmi = weight/(height*height);
if (0<bmi<18.5){
console.log('过轻');
}else{
if(18.5<=bmi<25){
console.log('正常');
if(25<=bmi<28){
console.log('过重');
if(28<=bmi<32){
console.log('肥胖');
console.log('严重肥胖');}}}}
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yPa_A
var bmi = weight/(height*height);
if (0<bmi<18.5){
console.log('过轻');
}else{
if(18.5<=bmi<25){
console.log('正常');
}else{
if(25<=bmi<28){
console.log('过重');
}else{
if(28<=bmi<32){
console.log('肥胖');
}else{
console.log('严重肥胖');}}}}