[TOC] ## URL ### url 生成 ``` var url1 = new URL('index.html', 'http://example.com'); url1.href // "http://example.com/index.html" var url2 = new URL('page2.html', 'http://example.com/page1.html'); url2.href // "http://example.com/page2.html" var url3 = new URL('..', 'http://example.com/a/b.html') url3.href // "http://example.com/" ``` ### url 解析 ``` var url = new URL('http://user:passwd@www.example.com:4097/path/a.html?x=111#part1'); url.href // "http://user:passwd@www.example.com:4097/path/a.html?x=111#part1" url.protocol // "http:" url.hostname // "www.example.com" url.host // "www.example.com:4097" url.port // "4097" url.origin // "http://www.example.com:4097" url.pathname // "/path/a.html" url.search // "?x=111" url.searchParams // URLSearchParams {} url.hash // "#part1" url.password // "passwd" url.username // "user" ```