代码无效

Question

var weight = parseInt(prompt("What is your weight?"));
var height = parseInt(prompt("What is your height?"));
var bmi;  
bmi= weight/ height; 
var bmiResult = bmi.toFixed(2); 
alert("your weight is" + bmiResult); 

if (bmiResult>=30) {     
  alert("obese");
}
else if (bmiResult>25 || bmi<30) {     
  alert('overweight');
}
else if (bmiResult>18.5 || bmi<=25) {     
  alert('normal');
}
else if (bmiResult>=16 || <=18.5) {     
  alert('underweight');
}
else (bmiResult<16) {     
  alert('very underweight');
}

此代码似乎不起作用，我无法弄清楚为什么......我正在尝试根据用户输入的权重/高度来获取if / else语句。谁能解释为什么它不起作用？

Answer 1

您忘记将变量放在运算符<=

之前

下面：

bmi= weight/ height; 

var bmiResult = bmi.toFixed(2); 

alert("your weight is" + bmiResult); 

if (bmiResult>=30) {     
alert("obese");
}

else if (bmiResult>25 || bmi<30)
{     alert('overweight');
}

else if (bmiResult>18.5 || bmi<=25)
{     alert('normal');
}

else if (bmiResult>=16 || bmiResult<=18.5)    // <== their it is
{     alert('underweight');
}

else (bmiResult<16)
{     alert('very underweight');
}

Answer 2

else if (bmiResult>=16 || <=18.5) { alert('underweight'); }

||中的

错误＆lt; = 18.5你的意思是|| bmiResult＆LT = 18.5