采集出来的代码
<p id='shipin'><iframe id='aaa' height=300 width=100% src="http://v.qq.com/iframe/player.html?vid=vid.replace(/^[\s\uFEFF\xA0] |[\s\uFEFF\xA0] $/g,"");
a.removeAttribute('src');
var obj = window.__getVideoWh(a),
mydiv = document.createElement('img');
mydiv.className = "img_loading";
mydiv.src="data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVQImWNgYGBgAAAABQABh6FO1AAAAABJRU5ErkJggg==";
mydiv.setAttribute("data-vid",vid);
mydiv.style.cssText = "width: " obj.w "px !important;height: " obj.h "px !important;";
a.style.display = "none";
insertAfter(mydiv,a);
a.style.cssText = ";width: " obj.w "px !important;height: " obj.h "px !important;";
a.setAttribute("width",obj.w);
a.setAttribute("height",obj.h);
a.setAttribute("data-vh",obj.vh);
a.setAttribute("data-vw",obj.vw);
a.setAttribute("src",location.protocol "//v.qq.com/iframe/player.html?&auto=0" frameborder=0 allowfullscreen></iframe></p>
微信的js里面的 iframe 代码
(function(){
var iframe = document.getElementsByTagName('iframe');
for (var i=0,il=iframe.length;i<il;i ) {
var a = iframe[i];
var src_ = a.getAttribute('src')||a.getAttribute('data-src')||"";
if(!/http(s)*\:\/\/v\.qq\.com\/iframe\/(preview|player)\.html\?/.test(src_)){
continue;
}
var vid = getQuery("vid",src_);
if(!vid){
continue;
}
vid=vid.replace(/^[\s\uFEFF\xA0] |[\s\uFEFF\xA0] $/g,"");
a.removeAttribute('src');
var obj = window.__getVideoWh(a),
mydiv = document.createElement('img');
mydiv.className = "img_loading";
mydiv.src="data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVQImWNgYGBgAAAABQABh6FO1AAAAABJRU5ErkJggg==";
mydiv.setAttribute("data-vid",vid);
mydiv.style.cssText = "width: " obj.w "px !important;height: " obj.h "px !important;";
a.style.display = "none";
insertAfter(mydiv,a);
a.style.cssText = ";width: " obj.w "px !important;height: " obj.h "px !important;" ;
a.setAttribute("width",obj.w);
a.setAttribute("height",obj.h);
a.setAttribute(" data-vh",obj.vh);
a.setAttribute("data-vw",obj.vw);
a.setAttribute("data-src",location.protocol "//v.qq.com/iframe/player.html?vid=" vid "&width=" obj.vw "&height=" obj.vh "&auto=0");
}
})();
})();
Why is this string of js code collected automatically? When there is a video, it is displayed. When there is no video, it is collected. Please explain the above code
