一、判断浏览器是否支持localStorage

    if (!window.localStorage) {
        console.log("浏览器不支持localStorage")
    } else {
        console.log("浏览器支持localStorage")
    }

二、往localStorage中写入内容：

    var DemoStorage = window.localStorage;
    //写入方法1：
    DemoStorage.name = "Tom";
    //写入方法2：
    DemoStorage["age"] = 18;
    //写入方法3：
    DemoStorage.setItem("hobby", "sport");
    
    console.log(DemoStorage.name,typeof DemoStorage.name);
    console.log(DemoStorage.age, typeof DemoStorage.age);
    console.log(DemoStorage.hobby, typeof DemoStorage.hobby);
    /*输出结果:
    Tom string
    18 string
    sport string*/

以上的代码的例子中：age输入的是一个number，但是输出时是一个string，可见localStorage只能存储string类型的数据。

三、localStorage的删除：

1、删除localStorage中所有的内容：

Storage.clear() 不接受参数，只是简单地清空域名对应的整个存储对象。

    var DemoStorage = window.localStorage;
    
    DemoStorage.name = "Tom";
    DemoStorage.age = 18;
    DemoStorage.hobby = "sport";
    
    console.log(DemoStorage);
    //输出：Storage {age: "18", hobby: "sport", name: "Tom", length: 3}
    DemoStorage.clear();
    console.log(DemoStorage);
    //输出: Storage {length: 0}

2、删除某个健值对：

Storage.removeItem() 接受一个参数——你想要移除的数据项的键，然后会将对应的数据项从域名对应的存储对象中移除。

    var DemoStorage = window.localStorage;

    DemoStorage.name = "Tom";
    DemoStorage.age = 18;
    DemoStorage.hobby = "sport";

    console.log(DemoStorage);
    //输出：Storage {age: "18", hobby: "sport", name: "Tom", length: 3}
    DemoStorage.removeItem("age");
    console.log(DemoStorage);
    //输出：Storage {hobby: "sport", name: "Tom", length: 2}