简易 localStorage/sessionStorage 封装

ls.js

(function(window, undefined) {

  // 编码
  function encode(str) {
    return encodeURIComponent(JSON.stringify(str));
  }

  // 解码
  function decode(str) {
    if (undefined == str) {
      return str;
    }

    try { // 解码可能失败
      str = JSON.parse(decodeURIComponent(str));
    } catch (e) {
      str = undefined
    }

    return str;
  }

  var Storage = [localStorage, sessionStorage];

  // 取值，赋值，删除
  function ls(key, val, session) {
    var s = Storage[session ? 1 : 0];

    if (undefined === val) { // 取值
      return decode(s.getItem(key));
    } else if (null === val) {
      s.removeItem(key);
    } else {
      s.setItem(key, encode(val));
    }
  }

  // ls 别名
  function ss(key, val) {
    return ls(key, val, true);
  }

  // 清理
  ls.clear = function(session) {
    Storage[session ? 1 : 0].clear();
  };

  // ls.clear 别名
  ss.clear = function() {
    ls.clear(true);
  };

  window.ls = ls;
  window.ss = ss;
})(window);