我使用此JavaScript代码从移动版YouTube网站获取可下载的视频网址。在iOS上获取YouTube音频网址
[webView stringByEvaluatingJavaScriptFromString:@"function getURL() {var player = document.getElementById('player'); var video = player.getElementsByTagName('video')[0]; return video.getAttribute('src');} getURL();"];
Output URL: http://o-o.preferred.seabone-mil1.v22.nonxt2.c.youtube.com/videoplayback?el=results&begin=0&yms=5682703339584930992&itag=18&ip=87.0.0.0&app=youtube_mobile&signature=B8CD6B60D2609F5F137B885806F8FAECAA88492F.333D3F19876A77CECB264059A3852BD021401296&sparams=id%2Cexpire%2Cip%2Cipbits%2Citag%2Csource%2Cratebypass%2Ccp&len=254000&ratebypass=yes&source=youtube&expire=1323579819&sver=3&key=yt1&ipbits=8&cp=U0hRSFVSV19GU0NOMV9NTEFJOmV5Qk5wc3hWaUxG&id=b8e73777013e0b7e&ps=blazer
我想只对视频的音频做同样的事情。但我还没有成功。谁能帮我?