检测浏览器是否允许设置localStorage.setItem（）;

Question

When using IE11 and using javascript's localStorage features, the browser console blocks javascript from being executed by throwing a message 'access denied' because of security settings within the browser.

Is there a way to detect via javascript of these settings are enabled?

I tried:

if(localStorage.setItem('testvar','123')){ alert('ok');}else{ alert('not ok');}

but still caused the rest of the script to halt.

thank you

Answer 1

function supports_html5_storage() {
  try {
    if ('localStorage' in window && window['localStorage'] !== null)
        {
          localStorage.setItem("testitem",true);
          localStorage.removeItem("testitem");
          return true;
        }
  } catch (e) {
    return false;
  }

}

Source: diveintohtml5

EDIT: Added localStorage.setItem to check, not only if it exists but if it is writable.