localstorage学习笔记

console.log(localStorage);

//写入数据

localStorage.setItem('name','lily');

//读出数据

console.log(localStorage.getItem('name'));//lily

//缓存数据的长度

console.log(localStorage.length);// 1

//读取存储在localStorage的所有数据

console.log(localStorage.valueOf());// Storage {name: "lily", length: 1}

// 读取第一条数据的变量名

console.log(localStorage.key(0));//  name

//删除某个变量

localStorage.removeItem("name");

console.log(localStorage.getItem('name'));//  null

//检查localStorage里是否保存某个变量

localStorage.hasOwnProperty('name');// true

console.log(localStorage.hasOwnProperty('name'));//  false

localStorage.hasOwnProperty('sex');// false

console.log(localStorage.hasOwnProperty('sex'))//false

//将数组转为本地字符串

vararr= ['aa','bb','cc'];// ["aa","bb","cc"]

localStorage.arr=arr;//["aa","bb","cc"]

//localStorage.setItem('arr',arr);

console.log(localStorage.getItem('arr'));

localStorage.arr.toLocaleString();// "aa,bb,cc"

console.log('=====>'+localStorage.arr.toLocaleString());

//将json存储到localstorage里

varstudents= {

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

varnewStudents=localStorage.getItem("students");

newStudents=JSON.parse(students);//转为JSON

console.log(newStudents);// 打印出原先对象