bmi = weight / (height*height);
if (bmi <= 0){
alert('不能是负数');
}else{ if (bmi <= 18.5){
alert('过轻');
}else{ if (bmi <= 25){
alert('正常');
}else{ if (bmi <= 28){
alert('过重');
}else{ if (bmi <= 32){
alert('过于肥胖');
}else{ alert('请填正确填写身高体重');
}}}}}
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root李
bmi = weight / (height*height);
if (bmi <= 0){
alert('不能是负数');
}else{ if (bmi <= 18.5){
alert('过轻');
}else{ if (bmi <= 25){
alert('正常');
}else{ if (bmi <= 28){
alert('过重');
}else{ if (bmi <= 32){
alert('过于肥胖');
}else{ alert('请填正确填写身高体重');
}}}}}