document.cookie

localStorage  存储格式都是字符串

有效期，清空缓存前，永远存在

作用域，限定在文档源级别

例

赋值

localStorage.a = 1；//注意存储的值为'1'

localStorage['a'] = 1；

删除

localStorage.removeItem('a');//清除a的值

localStorage.clear(); // 一无所有了所有数据都会干掉

取值

var a1 = localStorage['a'];//获取a的值

var a2 = localStorage.a;//获取a的值

var a3 = localStorage.getItem('a');//获取a的值

遍历

var  local_history = localStorage;

for(var tmp in local_history){

    console.log(tmp);

    console.log(local_history[tmp]);

//若value是url地址，则需要解密  decodeURI(local_history[tmp])

}