源码如下 <!doctype html> p.innerHTML = o.toString ? o.toString() : o; el.appendChild(p); } function outputData() { var el = document.getElementById('log'); el.innerHTML = ''; log('screen.width: ' + screen.width); log('screen.height: ' + screen.height); log('window.outerWidth: ' + window.outerWidth); log('window.outerHeight: ' + window.outerHeight); log('window.innerWidth: ' + window.innerWidth); log('window.innerHeight: ' + window.innerHeight); log('document.documentElement.clientWidth: ' + document.documentElement.clientWidth); log('document.documentElement.clientHeight: ' + document.documentElement.clientHeight); var box = document.getElementById('box'); log('div#box width: ' + box.offsetWidth); log('window.devicePixelRatio: ' + window.devicePixelRatio);