Question

我刚开始使用Chrome扩展程序。我正在尝试构建一个简单的扩展程序，允许我快速下载我当前所在的某个Youtube视频的mp3。第一步是检测当前网站是否是Youtube，我有问题。调试器没有说什么，所以我真的不知道问题是什么。这是代码：

// COPYRIGHT Gofilord May 2014
// Download mp3 songs from Youtube easily and quickly
// javascript file


var url = ''; // store the url of the current youtube song
var btn_group = $('.download-btn-group'); // caching
var errors = $('.errors');


// both are dynamic elements
// they show up accordingly 
btn_group.hide();
errors.hide();

// get current tab's URL 
// for sending that URL to the API of the mp3 converter
chrome.tabs.getSelected(null, function(tab) {
    url = tab.url;
});

// function to check if the current website is indeed Youtube
// add-on works ONLY on youtube.
function isYoutube() {
  if (url.toLowerCase().indexOf('www.youtube.com') >= 0) // if Youtube's address is    existing in the url
    return true; // that means the user is in youtube.
  return false;
}


if (isYoutube()) // if it's youtube
  btn_group.show(); // show the download buttons
else 
  errors.show(); // show a msg saying the website isn't youtube

谢谢！

检测当前标签是否为Chrome扩展程序中的Youtube时出现问题

0 个答案: