console 命令行工具 X clear

console

document.getElementById("aaa").innerText=navigator.userAgent;
var agent = window.navigator.userAgent.toLowerCase();
var ipad = agent.indexOf('ipad') > -1 || agent.indexOf('macintosh') > -1 && 'ontouchend' in document;
document.getElementById("bbb").innerText="iPad: "+(ipad == true);

<div id="aaa"></div>
<div id="bbb"></div>