var bmi =weight/(Math.pow(height,2)); (bmi<=18.5)&&(alert('低于18.5:过轻'))||((bmi>18.5)&&(bmi<=25))&&(alert('18.5-25:正常'))||((bmi>25)&&(bmi<=28))&&(alert('25-28:过重'))||((bmi>28)&&(bmi<=32))&&(alert('28-32:肥胖'))||(bmi>32)&&(alert('高于32:严重肥胖'));
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