在页面的head中添加如下代码：

if (/Android (\d+\.\d+)/.test(navigator.userAgent)) {
    var version = parseFloat(RegExp.$1)
    if (version > 2.3) {
        var phoneScale = parseInt(window.screen.width) / 750
        document.write('<meta name="viewport" content="width=750,minimum-scale=' + phoneScale + ',maximum-scale=' + phoneScale + ',target-densitydpi=device-dpi">')
    } else {
        document.write('<meta name="viewport" content="width=750,target-densitydpi=device-dpi">')
    }
} else {
    document.write('<meta name="viewport" content="width=750,user-scalable=no,target-densitydpi=device-dpi,minimal-ui">')
}