Add set/get object capacity to localStorage 为localStorage增加读、写Object的能力

addSetGet2localStorage.js

if (typeof Storage === 'undefined') {
  window.localStorage = {};
  localStorage.setItem = function (key, val) {
    this[key] = val;
  };
  localStorage.getItem = function (key) {
    return this[key];
  };
  window.localStorage.setObject = function (key, value) {
    this[key] = value;
  };
  window.localStorage.getObject = function (key) {
    return this[key];
  };
} else {
  Storage.prototype.setObject = function (key, value) {
    this.setItem(key, JSON.stringify(value));
  };

  Storage.prototype.getObject = function (key) {
    var value = this.getItem(key);
    return value && JSON.parse(value);
  };
}