vue如何添加全局函数或全局变量以及单页面的title设置总结

var setTitle = function (title) {
     var u = navigator.userAgent
     var isAndroid = u.indexOf('Android') > -1 || u.indexOf('Linux') > -1
     var isiOS = !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/)
     if (isAndroid) {
      document.title = title
     } else if (isiOS) {
      var $body = $('body')
      document.title = title
      var $iframe = $('')
      $iframe.on('load', function () {
       window.setTimeout(function () {
        $iframe.off('load').remove()
       }, 0)
      }).appendTo($body)
     }
    }

setTitle('XXOO')