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javascript - 如何将 cookie 的值设置为 0 如果

问题描述

所以，我一直在玩弄这个，我对 JS 感到很糟糕，但我觉得我真的很接近弄清楚它，所以即使只是被指向正确的方向也会有所帮助。

现在，我的音频可以通过 cookie 在页面更改中持续播放，这部分效果很好。但是，当歌曲源更改时，我真的希望歌曲从 0 开始。（现在它只是继续以 cookie 当前持有的值播放。）

这是我到目前为止所拥有的：

var song = document.getElementsByTagName("audio")[0];
var source = song.currentSrc;
var originalSource = source;
var played = false;
var tillPlayed = getCookie("timePlayed");
function update()
{
    if(!played){
        if(tillPlayed){
        if (source == originalSource){
                song.currentTime = tillPlayed;
                song.play();
                played = true;
            }
            else {
            song.currentTime = 0;
            cong.currentTime = tillPlayed;
            song.play();
            played = true;                  
            }
    }
    else {
        song.play();
        played = true;
    }
    }

    else {
    setCookie('timePlayed', song.currentTime);
    }
}
setInterval(update,0);

它只是让歌曲根本无法播放。

看起来它应该是正确的，我现在只是不知道为什么它不起作用。

任何人都有让它发挥作用的任何提示吗？

编辑：我已经将额外的代码移到了原始函数中，这就是我现在所拥有的。它仍然无法正常工作，音乐将再次播放，但不会重置 cookie。

cookie 确实发挥了应有的作用，我只是想改变它

标签： javascriptaudiocookies

解决方案

看起来您正在将 cookie 中的值分配给 song.currentTime 在重置后立即

song.currentTime = 0; 
song.currentTime = tillPlayed;

根据您的整体实现，您可以解决此解决方案变体中的注释中描述的几种方法：

var song = document.getElementsByTagName("audio")[0];/* orgiinal source song of the html player */
var source = getCookie("mySong");
if (source) /* You may different/additional logic for your exact use case*/
    song.currentSrc = source /*Set audio player's source */
else    
    source = song.currentSrc; /*Save audio player source */
var originalSource = source;
var played = false;
var tillPlayed = getCookie("timePlayed");
function update()
{
    if(!played)
    {
        if(tillPlayed)
        {
            if (source == originalSource) /* Note this this will only detect if the audio has since we came into the page. */
            {
                song.currentTime = tillPlayed;
                song.play();
                played = true;
            }
            else 
            {
                song.currentTime = 0;
                /* Since we just reset we do not want to retrieve the existing value in the cookie*/
                /* cong.currentTime = tillPlayed; */
                setCookie('timePlayed', song.currentTime);  /* Store the reset value in the cookie.  If the condition at the end is removed, you don't need to do this here. */
                setCookie('mySong', song.currentSrc);
                song.play();
                played = true;                  
            }
        }
        else 
        {
            song.play();
            played = true;
        }
    }
    /* If it does not interfere with existing logic, 
    consider removing the else and always storing the value in the cookie here. 
    */
    else 
    {
        setCookie('timePlayed', song.currentTime);
        setCookie('mySong', song.currentSrc);
    }
}
setInterval(update,0); /* Note that values of < 10ms resolve to 10ms */

希望有帮助

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