'use strict'; var age = 20; if (age >= 6) { if (age >= 18) { alert('adult'); } else { alert('teenager'); } } else { alert('kid'); }
'use strict'; var height = parseFloat(prompt('请输入身高(m):')); var weight = parseFloat(prompt('请输入体重(kg):')); //var bmi = parseFloat(weight/height/height); var bmi = parseFloat(weight / (Math.pow(height, 2))); if (isNaN(bmi) || bmi <= 0) { alert('请输入数字'); } else { if (bmi < 18.5) { alert('过轻'); } else if (bmi >= 18.5 && bmi < 25) { alert('正常'); } else if (bmi >= 25 && bmi < 28) { alert('过重'); } else if (bmi >= 28 && bmi < 32) { alert('肥胖'); } else { alert('严重肥胖'); } }
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秘密武器10