如何阅读JavaScript cookie？ [重复]

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这个问题在这里已有答案：

How do I create and read a value from cookie? 15 answers
如何从cookie创建和读取值？ 15个答案

I want to output a random number from JavaScript function that will be saved in cookie and will be called at the end of the application?

我想从JavaScript函数中输出一个随机数，该函数将保存在cookie中并在应用程序结束时调用？

  <script>
    document.getElementById("demo").innerHTML = Math.floor(Math.random()*50)*2;
   document.cookie="document.getElementById("demo").value";

</script>

<script>
      var x = document.value;
  document.getElementById("number").innerHTML = "x"
</script>

2 个解决方案

#1

This is from Mozilla Document.cookie docs:

这是来自Mozilla Document.cookie docs：

document.cookie = "name=oeschger";
document.cookie = "favorite_food=tripe";
alert(document.cookie);
// displays: name=oeschger;favorite_food=tripe

#2

Check out the W3Schools tutorial on cookies. As for your case, this is how you implement it:

查看关于cookie的W3Schools教程。至于你的情况，这就是你实现它的方式：

<!-- Start of the Application -->
<script>
document.getElementById("demo").innerHTML = Math.floor(Math.random()*50)*2;

// Following functions from W3Schools
function setCookie(cname, cvalue, exdays) {
    var d = new Date();
    d.setTime(d.getTime() + (exdays*24*60*60*1000));
    var expires = "expires="+d.toUTCString();
    document.cookie = cname + "=" + cvalue + "; " + expires;
}
function getCookie(cname) {
    var name = cname + "=";
    var ca = document.cookie.split(';');
    for(var i=0; i<ca.length; i++) {
        var c = ca[i];
        while (c.charAt(0)==' ') c = c.substring(1);
        if (c.indexOf(name) == 0) return c.substring(name.length,c.length);
    }
    return "";
}

// set a cookie "number" to the `innerHTML` of the element with Id `demo`.
setCookie("number",document.getElementById("demo").innerHTML,365);
</script>

<!-- End of the application -->
<script>
// get the value of the cookie "number" that was set earlier
var x = getCookie("number");

// Change the Id to whatever you need
document.getElementById("whatever").innerHTML = x;
</script>

#1