html5：localStorage储存

实例：刷新值会增长，关掉浏览器，再打开，值会在原基础上增长

if(localStorage.pagecount){
    localStorage.pagecount=Number(localStorage.pagecount)+1;
}else{
    localStorage.pagecount=1;
}
document.write(localStorage.pagecount);

设置和取值两种方法：

1、操作dot

设值
localStorage.hello = ‘world‘;
localStorage.zhangsan = ‘lisi‘;
取值：
var value_of_hello_in_localStorage = localStorage.hello;
var value_of_zhangsan_in_localStorage = localStorage.zhangsan

2、get setItem

设值：
localStorage.setItem("hello", "world");
localStorage.setItem("zhangsan", "lisi");
取值：
localStorage.getItem("hello");
localStorage.getItem("zhangsan");