用正则判断手机品牌

var userAgent = navigator.userAgent;if(userAgent.match(/vivo/!)){
console.log("这是vivo手机")
}else if(userAgent.match(/samsung/i)){
console.log("这是三星手机")
}else if(userAgent.match(/huawei/i)){
cosole.log("这是华为手机")
}else if(....){
........
}

判断系统

  var userAgent = navigator.userAgent;var isAndroid = userAgent.indexOf('Android') > -1 || u.indexOf('Adr') > -1; var isiOS = !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/); if(isAndroid){
console.log("安卓系统")
}else if(isios){
console.log("ios系统")
}