var bmi = weight / height**2;
console.log(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');
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*花前
var bmi = weight / height**2;
console.log(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');