例子

<ul id="edit" contenteditable="true">

    <li>修改我吧，然后刷新页面看看，^_^</li>

</ul>

JS代码：

var edit = document.getElementById("edit");

edit.onblur = function(){

    localStorage.setItem("tododata", this.innerHTML);

};

if(localStorage.getItem("tododata")){

    edit.innerHTML = localStorage.getItem("tododata");

}

var TOKEN_KEY = "jwtToken";

//取值

function getJwtToken() {
        return localStorage.getItem(TOKEN_KEY);
    }

//保存
    function setJwtToken(token) {
        localStorage.setItem(TOKEN_KEY, token);
    }

//删除
    function removeJwtToken() {
        localStorage.removeItem(TOKEN_KEY);
    }

参考下:https://www.cnblogs.com/st-leslie/p/5617130.html