javascript - 切换功能 Vanilla javascript

Question

我想在点击温度时在度数和华氏度之间切换。

当点击度数时我已经设法做到这一点，它被更改为华氏度，但是现在我如何在点击华氏度时将它改回度数？

    temp.addEventListener('click', degreeToF);

    function degreeToF() {
     const f = manchester.current.temp_c * 1.8 + 32;
     temp.innerHTML = f.toFixed(0) + '<span class="degrees"> f </span>';
    }

这是我的代码笔:https://codepen.io/o-sewell/pen/mRyEyW

Answer 1

var showing = 'F';
temp.addEventListener('click', degreeToF);

function degreeToF() {
 if(showing === 'F'){
   // convert to C
   showing = 'C';
   const f = (manchester.current.temp_c - 32 ) * 5/9;
   temp.innerHTML = f.toFixed(0) + '<span class="degrees"> c </span>';
 } else {
   // convert to 
   showing = 'F';
   const f = manchester.current.temp_c * 1.8 + 32;
   temp.innerHTML = f.toFixed(0) + '<span class="degrees"> f </span>';

 }
}