以前判断网站的访客全部用的是 userAgent 来判断的，基本上都是判断 userAgent，一些简单点的终端没有什么问题，可是用过一段时间发现有的手机终端不会跳转，后面研究了下百度 siteapp，发现他的函数写的挺好的，可以直接拿来用，判断的也比较全面。
使用 userAgent
判断（iPhone|iPod|Android|ios|iPad）
- function uaredirect(murl) {
- try {
- if (document.getElementById("bdmark") != null) {
- return;
- }
- var urlhash = window.location.hash;
- if (!urlhash.match("fromapp")) {
- if ((navigator.userAgent.match(/(iPhone|iPod|Android|ios|iPad)/i))) {
- location.replace(murl);
- }
- }
- } catch(err) {}
- }
使用百度 siteapp 判断
- <script src="http://siteapp.baidu.com/static/webappservice/uaredirect.js" type="text/javascript"></script>
- <script type="text/javascript">uaredirect("http://m.baidu.com");</script>
我们来看看 uaredirect 的源代码
- function uaredirect(f) {
- try {
- if (document.getElementById("bdmark") != null) {
- return
- }
- var b = false;
- if (arguments[1]) {
- var e = window.location.host;
- var a = window.location.href;
- if (isSubdomain(arguments[1], e) == 1) {
- f = f + "/#m/" + a;
- b = true
- } else {
- if (isSubdomain(arguments[1], e) == 2) {
- f = f + "/#m/" + a;
- b = true
- } else {
- f = a;
- b = false
- }
- }
- } else {
- b = true
- }
- if (b) {
- var c = window.location.hash;
- if (!c.match("fromapp")) {
- if ((navigator.userAgent.match(/(iPhone|iPod|Android|ios)/i))) {
- location.replace(f)
- }
- }
- }
- } catch(d) {}
- }
- function isSubdomain(c, d) {
- this.getdomain = function(f) {
- var e = f.indexOf("://");
- if (e > 0) {
- var h = f.substr(e + 3)
- } else {
- var h = f
- }
- var g = /^www./;
- if (g.test(h)) {
- h = h.substr(4)
- }
- return h
- };
- if (c == d) {
- return 1
- } else {
- var c = this.getdomain(c);
- var b = this.getdomain(d);
- if (c == b) {
- return 1
- } else {
- c = c.replace(".", "\.");
- var a = new RegExp("\." + c + "$");
- if (b.match(a)) {
- return 2
- } else {
- return 0
- }
- }
- }
- };
压缩代码
- function uaredirect(f){try{if(document.getElementById("bdmark")!=null){return}var b=false;if(arguments[1]){var e=window.location.host;var a=window.location.href;if(isSubdomain(arguments[1],e)==1){f=f+"/#m/"+a;b=true}else{if(isSubdomain(arguments[1],e)==2){f=f+"/#m/"+a;b=true}else{f=a;b=false}}}else{b=true}if(b){var c=window.location.hash;if(!c.match("fromapp")){if((navigator.userAgent.match(/(iPhone|iPod|Android|ios)/i))){location.replace(f)}}}}catch(d){}}function isSubdomain(c,d){this.getdomain=function(f){var e=f.indexOf("://");if(e>0){var h=f.substr(e+3)}else{var h=f}var g=/^www./;if(g.test(h)){h=h.substr(4)}return h};if(c==d){return 1}else{var c=this.getdomain(c);var b=this.getdomain(d);if(c==b){return 1}else{c=c.replace(".","\.");var a=new RegExp("\."+c+"$");if(b.match(a)){return 2}else{return 0}}}};
