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练习

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var bmi = weight/height*height;
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');
}

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