navigator:"appCodeName:Mozilla;appName:Microsoft Internet Explorer;appMinorVersion:Release Candidate 1;cpuClass:x86;プラットフォーム:Win32;systemLanguage:zh-cn;userLanguage:zh-cn;appVersion:4.0 (互換性; MSIE 8.0; Windows NT 5.1; Tridentu002F4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729);userAgent:Mozillau002F4.0 (互換性; MSIE 8.0; Windows NT 5.1; Tridentu002F4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0。 4506.2152; .NET CLR 3.5.30729);onLine:true;cookieEnabled:true"
alert(document.body.querySelectorAll);
var els = document.body.querySelectorAll('div');
alert(els[2]);// 2 > els.length-1
7. 拡張子: