【cocos creator】localStorage存，读取数据，json与字符串转换

localStorage存数据

userData：数据名
JSON.stringify(userData)：json文件（也可以是数据

var userData = {
id: Id,//存id
name: Name,//存姓名
};
cc.sys.localStorage.setItem(‘userData’, JSON.stringify(userData));

读取：

        var str = cc.sys.localStorage.getItem('userData');//读取数据
        var userData = JSON.parse(str);//转为json格式id
        this.name = userData.name;//读取姓名
        this.id = userData.id;//读取id

// Learn cc.Class:
//  - [Chinese] https://docs.cocos.com/creator/manual/zh/scripting/class.html
//  - [English] http://docs.cocos2d-x.org/creator/manual/en/scripting/class.html
// Learn Attribute:
//  - [Chinese] https://docs.cocos.com/creator/manual/zh/scripting/reference/attributes.html
//  - [English] http://docs.cocos2d-x.org/creator/manual/en/scripting/reference/attributes.html
// Learn life-cycle callbacks:
//  - [Chinese] https://docs.cocos.com/creator/manual/zh/scripting/life-cycle-callbacks.html
//  - [English] https://www.cocos2d-x.org/docs/creator/manual/en/scripting/life-cycle-callbacks.html

cc.Class({
    extends: cc.Component,

    properties: {
        // foo: {
        //     // ATTRIBUTES:
        //     default: null,        // The default value will be used only when the component attaching
        //                           // to a node for the first time
        //     type: cc.SpriteFrame, // optional, default is typeof default
        //     serializable: true,   // optional, default is true
        // },
        // bar: {
        //     get () {
        //         return this._bar;
        //     },
        //     set (value) {
        //         this._bar = value;
        //     }
        // },
    },

    // LIFE-CYCLE CALLBACKS:

    onLoad() {
        this.name = "";
        this.id = 0;
        this.readMsg();
    },

    start() {

    },

    save: function () {
        this.saveMsg(this.id, this.name);
    },

    saveMsg: function (Id, Name) {
        var userData = {
            id: Id,
            name: Name,
        };
        cc.sys.localStorage.setItem('userData', JSON.stringify(userData));//存数据
    },

    readMsg: function () {
        if (cc.sys.localStorage.getItem('userData') ) {
            var str = cc.sys.localStorage.getItem('userData');//读取数据
            str = str.replace(/\ +/g, "");//去掉空格
            str = str.replace(/[\r\n]/g, "");//去掉回车换行
            var userData = JSON.parse(str);
            this.name = userData.name;
            this.id = userData.id;
        } else {
            this.save();
        }
    }


    // update (dt) {},
});

json与字符串转换

JSON.stringify()的作用是将 JavaScript 对象转换为 JSON 字符串，而JSON.parse()可以将JSON字符串转为一个对象。

删除

window.localStorage.removeItem('key')
//清除所有
//window.localStorage.clear()