Question

我有一个bmi计算器并将条件转换为switch语句以使其更清晰。但是，现在代码正在破坏，并且不会导致设置var结果，因此可以显示它。

我在这里缺少什么想法？

JS

 $('#calculatebutton').click(function () {
         var weight = parseInt($('#weight-lb').val()),
             heightInches = parseInt($('#height-ft').val()) + parseInt($('#height-in').val()),
             heightsqaured = (heightInches) * (heightInches),
             result = ((weight) / (heightsqaured) * 703);


              switch(result) {

                case (result < 16):
                     var rating = 'You are severely underweight';
                     break;


                case (result > 16) && (result < 18.5):
                     var rating = 'You are underweight';
                     break;


                case (result > 18.5) && (result < 25):
                     var rating = 'You are healthy';
                     break;


                case (result > 25) && (result < 30):
                     var rating = 'You are overweight';
                     break;


                case (result > 30) && (result < 35):
                     var rating = 'You are moderately obese';
                     break;


                case (result > 80):
                     var rating = 'This result seems unlikely, please check that the information you have entered is correct';
                     break;       
            }

            $('#result').html('Your BMI is ' + result.toFixed(1) + '. ' + rating + '.');

     });

JS小提琴 http://jsfiddle.net/o12xpy2s/

Answer 1

变化：

switch(result) {

...为：

switch(true) {

您的switch个案件都是true或false条件。因此，将switch表达式switch(expression)设置为其中一个。在这里，您需要查找列出的true的{{1}}条件。

切换案例失败，返回NaN

1 个答案: