画像のPC/SP切り替え

change_image.js

function changeImage(){
  var pcSuffix   = '_pc',
      spSuffix   = '_sp',
      breakPoint = 480;

  $('.resimg').each(function(){
    var $img = $(this);
    if ( window.innerWidth < breakPoint ) {
      $img.attr('src',$img.attr('src').replace(pcSuffix,spSuffix));
    } else {
      $img.attr('src',$img.attr('src').replace(spSuffix,pcSuffix));
    }
  });
}