Javascript音频暂停按钮工作，但不会再次恢复

Question

我正在尝试在Javascript上构建一个Swing Era点唱机。几乎一切都有效，除了'针'。我希望我不是唯一仍然使用乙烯基的人！可以说暂停按钮应该能够从音频暂停的位置恢复，就像抬起针并将其放在同一位置一样。它现在只能暂停。

这是JS代码，或者我认为是相关的摘录：

  var playtext = $("div#play").text()
  var playing = false

  function Jukebox(){
    this.tune = $("audio")[0];

    Jukebox.prototype.play = function(){ 
      this.tune.play();
      playing = true;
    }

    Jukebox.prototype.pause = function(){
      this.tune.pause(); //Apparently, pause is a built-in function?!
      playing = false;
    }

    Jukebox.prototype.needle = function(){
      if (playing = true) {
        this.tune.pause();
        playing = false; 
      }
      if (playing = false) {
        this.tune.play();
        playing = true; //After it is paused, it cannot play again?!  Why?
      }
    }

Answer 1

查看此声明

if(playing === true)

而不是

if(playing = true)

Answer 2

我明白了。我在这里使用冗余语言。答案是：

Jukebox.prototype.needle = function(){
  if (playing) {
    this.tune.pause();
    playing = false; 
  }
  else {
    this.tune.play();
    playing = true; //After it is paused, it cannot play again?!  Why?
  }