(function () { var phoneWidth = parseInt(window.screen.width); var phoneScale = phoneWidth / 640; var ua = navigator.userAgent; if (/Android (\d+\.\d+)/.test(ua)) { var version = parseFloat(RegExp.$1); if (version > 2.3) { // andriod 2.3以上 document.write('<meta name="viewport" content="width=640, minimum-scale = ' + phoneScale + ', maximum-scale = ' + phoneScale + ', target-densitydpi=device-dpi">'); } else { // andriod 2.3 document.write('<meta name="viewport" content="width=640, target-densitydpi=device-dpi">'); } // IOS及其他系统 } else { document.write('<meta name="viewport" content="width=640, user-scalable=no">'); } })()