常用的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 localStorage // Storage {length: 0} 存储数据
localStorage.setItem("name","caibin") //存储名字为name值为caibin的变量localStorage.name = "caibin"; // 等价于上面的命令localStorage // Storage {name: "caibin", length: 1} 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.name // "caibin"localStorage.valueOf() //读取存储在localStorage上的所有数据localStorage.key(0) // 读取第一条数据的变量名(键值)//遍历并输出localStorage里存储的名字和值for(var i=0; i 删除某个变量
localStorage.removeItem("name"); //undefinedlocalStorage // Storage {length: 0} 可以看到之前保存的name变量已经从localStorage里删除了 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') // truelocalStorage.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JSONconsole.log(newStudents); // 打印出原先对象
转自:http://www.jianshu.com/p/39ba41ead42e