localstorage 那些事 +vue记住密码实例
localStorage.然后就弹出了一些列宿主(浏览器)提供的localStorage自带的方法,摘录了一些常用的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xkey读取第i个数据的名字或称为键值(从0开始计数)lengthlocalStorage存储变量的
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localStorage.
然后就弹出了一些列宿主(浏览器)提供的localStorage自带的方法,摘录了一些常用的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<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
例子:
获取存储值:
getlocaluser(locuser,locpwd){//获取localstroage存储的用户名密码 this.sel=false; this.username = localStorage.getItem(locuser) this.password = localStorage.getItem(locpwd) if(localStorage.getItem(locuser)&&localStorage.getItem(locpwd)){ this.sel=true; } }
设置存储值:
if(this.sel){ //设置要记住的账户,密码 localStorage.setItem("user",that.username) localStorage.setItem("pwd",that.password) }else{ localStorage.removeItem("user"); localStorage.removeItem("pwd"); }
其中变量自行了断~~~
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