undefined href属性值javascript

Question

我想要href值，但这给了我undefined，为什么？

var hy = $('.Player a.sc-player').attr('href'); 

console.log(hy); 

<div id="Container"> 
    <header> 
    <div id="Player"> 
     <div class="Player"> 
     <a href="https://soundcloud.com/rapzilla/andy-mineo-stop-the-traffic" class="sc-player"></a> 
     <p>hellow</p> 
     <a href="" class="download_song">Download</a> 
     </div> 
    </div> 
    <!--/Player--> 
    </header>**strong text** 

Answer 1

$（文件）。就绪（函数（）{

alert($('.Player a.sc-player').attr('href')) 
});