判断用户当前设备终端型号 – 设备侦测工具

2017-08-08 分类：别具匠心作者：管理员阅读（15992）

判断用户当前是什么设备，甚至可以侦测出手机型号乃至系统版本。此代码来自SUI Mobile源码，我只是搬运工，需要借助zepto.js

SUI Mobile官方提供的zepto.js（CDN），懒人必备

1	<script type='text/javascript' src='//g.alicdn.com/sj/lib/zepto/zepto.min.js' charset='utf-8'></script>

源码如下：

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$(function(){
(function ($) {
"use strict";
var device = {};
var ua = navigator.userAgent;

var android = ua.match(/(Android);?[\s\/]+([\d.]+)?/);
var ipad = ua.match(/(iPad).*OS\s([\d_]+)/);
var ipod = ua.match(/(iPod)(.*OS\s([\d_]+))?/);
var iphone = !ipad && ua.match(/(iPhone\sOS)\s([\d_]+)/);

device.ios = device.android = device.iphone = device.ipad = device.androidChrome = false;

// Android
if (android) {
device.os = 'android';
device.osVersion = android[2];
device.android = true;
device.androidChrome = ua.toLowerCase().indexOf('chrome') >= 0;
}
if (ipad || iphone || ipod) {
device.os = 'ios';
device.ios = true;
}
// iOS
if (iphone && !ipod) {
device.osVersion = iphone[2].replace(/_/g, '.');
device.iphone = true;
}
if (ipad) {
device.osVersion = ipad[2].replace(/_/g, '.');
device.ipad = true;
}
if (ipod) {
device.osVersion = ipod[3] ? ipod[3].replace(/_/g, '.') : null;
device.iphone = true;
}
// iOS 8+ changed UA
if (device.ios && device.osVersion && ua.indexOf('Version/') >= 0) {
if (device.osVersion.split('.')[0] === '10') {
device.osVersion = ua.toLowerCase().split('version/')[1].split(' ')[0];
}
}

// Webview
device.webView = (iphone || ipad || ipod) && ua.match(/.*AppleWebKit(?!.*Safari)/i);

// Minimal UI
if (device.os && device.os === 'ios') {
var osVersionArr = device.osVersion.split('.');
device.minimalUi = !device.webView &&
(ipod || iphone) &&
(osVersionArr[0] * 1 === 7 ? osVersionArr[1] * 1 >= 1 : osVersionArr[0] * 1 > 7) &&
$('meta[name="viewport"]').length > 0 && $('meta[name="viewport"]').attr('content').indexOf('minimal-ui') >= 0;
}

// Check for status bar and fullscreen app mode
var windowWidth = $(window).width();
var windowHeight = $(window).height();
device.statusBar = false;
if (device.webView && (windowWidth * windowHeight === screen.width * screen.height)) {
device.statusBar = true;
}
else {
device.statusBar = false;
}

// Classes
var classNames = [];

// Pixel Ratio
device.pixelRatio = window.devicePixelRatio || 1;
classNames.push('pixel-ratio-' + Math.floor(device.pixelRatio));
if (device.pixelRatio >= 2) {
classNames.push('retina');
}

// OS classes
if (device.os) {
classNames.push(device.os, device.os + '-' + device.osVersion.split('.')[0], device.os + '-' + device.osVersion.replace(/\./g, '-'));
if (device.os === 'ios') {
var major = parseInt(device.osVersion.split('.')[0], 10);
for (var i = major - 1; i >= 6; i--) {
classNames.push('ios-gt-' + i);
}
}

}
// Status bar classes
if (device.statusBar) {
classNames.push('with-statusbar-overlay');
}
else {
$('html').removeClass('with-statusbar-overlay');
}

// Add html classes
if (classNames.length > 0) $('html').addClass(classNames.join(' '));

// keng..
device.isWeixin = /MicroMessenger/i.test(ua);

$.device = device;
})(Zepto);

$.device提供了一些基本的设备侦测信息可供使用。举例如下

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console.log($.device)
// --------
{
android: true
androidChrome: false
ios: false
ipad: false
iphone: false
isWeixin: false
os: "android"
osVersion: "4.4.1"
pixelRatio: 3
statusBar: false
webView: null
}

同时提供$.compareVersion工具用以方便的进行版本号比较：

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// arg1 > arg2, return 1; arg1 == arg2, return 0; arg1 < arg2, return -1
$.compareVersion('8.0', '7.1.1')
// return 1
$.compareVersion('4.2', $.device.osVersion)
// return -1
$.compareVersion('5.0', '5.0')
// return 0

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