切换css主题

    
  computed:  {
     curTheme (){
       return   this . $store . state . curTheme
    }
  },
 
changeTheme (){
     //  let newTheme = "light"
     let   newTheme   =   this . curTheme   ==   "dark" ? "light" : "dark"
     this . $store . commit ( "changeTheme" , newTheme )
 
     let   cssElement   =   document . getElementById ( "csId" )
     cssElement . parentNode . removeChild ( cssElement )
     // let currentCssTheme = sessionStorage.getItem("cssTheme")
     //   console.log(currentCssTheme)
     //   let newTheme = currentCssTheme == "black"?"white":"black"
       // sessionStorage.setItem("cssTheme",newTheme)
       newTheme   =   "/" + newTheme + "Theme.css"
       console . log ( newTheme )
       var   link   =   document . createElement ( 'link' );
       link . type   =   'text/css' ;
       link . id   =   "csId" ;   // 加上id方便后面好查找到进行删除
       link . rel   =   'stylesheet' ;
       link . href   =   newTheme
       // link.href = '/whiteTheme.css';
       document . getElementsByTagName ( "head" )[ 0 ]. appendChild ( link );     
   }