localStorage

localStorage.setItem( key, val)

localStorage.getItem( key)

localStorage[key] = JSON.stringify(数组);

data = JSON.parse(localStorage[key]);

localStorage.setItem( 'name', JSON.stringify({name:1}))
localStorage.getItem( 'name')
"{"name":1}"

localStorage.setItem( 'name', JSON.stringify([1,2,3,4]))
localStorage.getItem( 'name')
"[1,2,3,4]"
JSON.parse(localStorage.getItem( 'name'))
[1, 2, 3, 4]

字符串存储 取出也是字符串类型

localStorage.setItem( 'num', 1)
localStorage.getItem( 'num')
"1"

如果已知存储的内容，单数字可以强转，一定要转换成数字才能使用