title: sessionStorage doesn't work with JSON.stringify or ?
body: <p>Why doesn't this work ? </p>
  
  <pre><code>function VarsStorage(act,varname,val){
    if(act == 'get'){
      return sessionStorage.getItem(varname+'Cache');
    }else if(act == 'set'){
      sessionStorage.setItem(varname+'Cache', val);   
    }
  }
  
  VarsStorage('set','addStocksList',JSON.stringify(holder));
  </code></pre>
  
  <p>I try many combinations of this code and it still doesn't work. </p>