localStorage的基本使用
localStorage.setItem('test1','name')
undefined
localStorage.setItem('test2','age')
undefined
localStorage.getItem('test2')
"age"
localStorage.key(0)
"test2"
localStorage.key(1)
"test1"
var userInfo = {'name':'shanxiongtao','age':'10'}
undefined
localStorage.setItem('userInfo',JSON.stringify(userInfo))
undefined
JSON.parse(localStorage.getItem('userInfo'))
{name: "shanxiongtao", age: "10"}