localStorage用法小总结
API如下表所示
名称 | 作用 |
---|---|
clear | 清空localStorage上存储的数据 |
getItem | 读取数据 |
hasOwnProperty | 检查localStorage上是否保存了变量x,需要传入x |
key | 读取第i个数据的名字或称为键值(从0开始计数) |
length | localStorage存储变量的个数 |
propertyIsEnumerable | 用来检测属性是否属于某个对象的 |
removeItem | 删除某个具体变量 |
setItem | 存储数据 |
toLocaleString | 将(数组)转为本地字符串 |
valueOf | 获取所有存储的数据 |
清空localStorage
localStorage.clear() // undefined
存储数据
localStorage.setItem("name","caibin") //存储名字为name值为caibin的变量
读取数据
localStorage.getItem("name") //caibin,读取保存在localStorage对象里名为name的变量的值
localStorage.valueOf() //读取存储在localStorage上的所有数据
删除某个变量
localStorage.removeItem("name"); //undefined
检查localStorage里是否保存某个变量
// 这些数据都是测试的,是在我当下环境里的,只是demo哦~
localStorage.hasOwnProperty('name') // true
localStorage.hasOwnProperty('sex') // false
将数组转为本地字符串
var arr = ['aa','bb','cc']; // ["aa","bb","cc"]
localStorage.arr = arr //["aa","bb","cc"]
localStorage.arr.toLocaleString(); // "aa,bb,cc"
将JSON存储到localStorage里
var students = { xiaomin: { name: "xiaoming", grade: 1 }, teemo: { name: "teemo", grade: 3 } }
students = JSON.stringify(students); //将JSON转为字符串存到变量里
console.log(students); localStorage.setItem("students",students);//将变量存到localStorage里
var newStudents = localStorage.getItem("students");
newStudents = JSON.parse(students); //转为JSON
console.log(newStudents); // 打印出原先对象