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HTML

              
                .wrapper
  section.sw-sec
    h1.sw-title 640*480
    #res1.sw-res(data-w="640", data-h="480")
    
  section.sw-sec
    h1.sw-title 1920*1080
    #res2.sw-res(data-w="1920", data-h="1080")
    
  section.sw-sec
    h1.sw-title 720*480
    #res3.sw-res(data-w="720", data-h="480")
    
    
  section.sw-sec
    h1.sw-title 任意のサイズ
    
    .sw-option
      .sw-option-input
        .sw-option-sec
          span.sw-option-context.x 横:
          input#ratio-w.sw-option-val(type="text", value="1920")
        .sw-option-sec
          span.sw-option-context.y 縦:
          input#ratio-h.sw-option-val(type="text", value="1080")
      .sw-option-result
        button#res-btn.sw-res-btn(type="button") 計算
        #res4.sw-res
    
  
    
  
      
              
            
!

CSS

              
                .wrapper
  padding: 20px
  
.sw
  &-sec
    margin-bottom 2em
  &-title
    font-size 98%
    
  &-option
    &-input
      margin-bottom 20px
    &-sec
      margin-bottom 10px
      &:last-child
        margin-bottom 0
    &-context
      display inline-block
        
  &-res-btn
    cursor pointer
    margin-bottom 20px
    &:focus
      outline: none
  
              
            
!

JS

              
                /**
 * 最大公約数を求める
 */
function gcd(x, y){
  if(y === 0) return x
  return gcd(y, x % y)
 }


/**
 * 予め決めておいたアスペクト比の計算
 */
const arr = ['res1','res2','res3']
for(let i = 0, iLen = arr.length; i < iLen; i++){
  const id = arr[i]
  const res = document.getElementById(id)
  const w = res.dataset.w
  const h = res.dataset.h
  const g = gcd(w,h)
  const ratio_w = w / g
  const ratio_h = h / g
  
  res.innerHTML = `結果:${ratio_w}:${ratio_h}`
}


const btn = document.getElementById('res-btn')
const ops_res = document.getElementById('res4')
const ops_w = document.getElementById('ratio-w')
const ops_h = document.getElementById('ratio-h')


/**
 * 任意に入力したサイズのアスペクト比を計算
 */
btn.addEventListener('click', ()=>{
  const w = ops_w.value - 0
  const h = ops_h.value - 0
  const g = gcd(w,h)
  const x = w / g
  const y = h / g
  
  ops_res.innerHTML = `結果:${x}:${y}`
}, false)








              
            
!
999px

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