localStorage用法小总结

首先在开发者工具的Console中，输入了：localStorage.
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<localStorage.length;i++){ 
    console.log('localStorage里存储的第'+i+'条数据的名字为：'+localStorage.key(i)+',值为：'+localStorage.getItem(localStorage.key(i)));
    }

删除某个变量

localStorage.removeItem("name"); //undefined
localStorage // 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') // 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

localStorage用法总结

localStorage用法小总结

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