具有全局变量的本地存储

Question

I am doing quiz show. If the user knows the questions, his money and his score will increase. At first, I gave them money and a score. you know. and I keep the score and the money in the local depot. but when the game is reopened the money and score will be my first defined value. how do I prevent it?

var cnt=1000;
var score = 0; 

cnt and score are the global variables. I use local storage.

 localStorage.setItem("score ", score );
 localStorage.setItem("cnt", cnt);

When you give the right answer,

if (deger == crntUserr) {
    DevExpress.ui.dialog.alert('Correct');
    cnt = cnt + 100;
    score = score + 10;
}

I do not want it to have an initial value

Answer 1

You should start the app while immediately reading your localStorage.

var cnt = Number(localStorage.getItem('cnt')) || 1000;
var score = Number(localStorage.getItem('score')) || 0; 

off course upon stopping the application or onChange

if (deger == crntUserr) {
    DevExpress.ui.dialog.alert('Correct');
    cnt = cnt + 100;
    score = score + 10;

    // store the new value
    localStore.setItem('cnt', cnt);
    localStore.setItem('score', score);
}

Answer 2

You never update your localStorage value, so when restart app, they still have initial value so change your function to this :

if (deger == crntUserr) {
    DevExpress.ui.dialog.alert('Correct');

    var cntStorage= JSON.parse(localStorage.getItem('cnt'));
    var scoreStorage= JSON.parse(localStorage.getItem('score'));

    cnt = cntStorage + 100;
    score = scoreStorage + 10;

    localStorage.setItem('cnt', JSON.stringify(cnt));
    localStorage.setItem('score', JSON.stringify(score));
}