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Aug 17th, 2017
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  1. (function(){
  2.  
  3. //htmlタグを変数に
  4. var htmlTag = document.documentElement;
  5.  
  6. //userAgentを変数に
  7. var userAgent = window.navigator.userAgent.toLowerCase();
  8.  
  9. //OS,ブラウザを変数に
  10. var osList = ['android','iphone','ipad'];
  11. //PCかどうか判定フラグ
  12. var pcFlag = true;
  13. //スペースを定数に
  14. var SPACE = ' ';
  15.  
  16. //OSを判定してhtmlタグにクラスをつける
  17. for (var i = 0, len = osList.length; i < len; i++) {
  18.  
  19. if (userAgent.indexOf(osList[i]) !== -1) {
  20. htmlTag.className += SPACE + osList[i];
  21. pcFlag = false;
  22. break;
  23. }
  24. }
  25.  
  26. //osList('android','iphone','ipad')のどれでもなければ、PCと判定
  27. if (pcFlag === true) {
  28. htmlTag.className += SPACE + 'pc';
  29. }
  30.  
  31. })();
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