localStorage在无痕模式下存在，但调用其方法会抛异常; localStorage is exist in incognito mode, but invoking functions of localStorage will throw exceptions.

localStorage.js

/**
 * 是否支持localStorage
 */
function isSupportStorage() {
  if(!localStorage) return false;
  try {
    localStorage.setItem('__test__', '__test__');
    localStorage.removeItem('__test__');
    return true;
  } catch(e) {
    return false;
  }
}