基于JS实现移动端访问PC端页面时跳转到对应的移动端网页

//判断是否移动端，如果是则跳转到指定的URL地址
function browserRedirect(url) {
//只读的字符串，声明了浏览器用于 HTTP 请求的用户代理头的值
var sUserAgent = navigator.userAgent.toLowerCase();
var bIsIphoneOs = sUserAgent.match(/iphone os/i) == "iphone os";
var bIsMidp = sUserAgent.match(/midp/i) == "midp";
var bIsUc7 = sUserAgent.match(/rv:1.2.3.4/i) == "rv:1.2.3.4";
var bIsUc = sUserAgent.match(/ucweb/i) == "ucweb";
var bIsAndroid = sUserAgent.match(/android/i) == "android";
var bIsCE = sUserAgent.match(/windows ce/i) == "windows ce";
var bIsWM = sUserAgent.match(/windows mobile/i) == "windows mobile";
if (bIsIphoneOs || bIsMidp || bIsUc7 || bIsUc || bIsAndroid || bIsCE || bIsWM) {
window.location.replace(url);
}
}

<script src="../js/wap.js"></script>
<script type="text/javascript">browserRedirect("http://ycdoit.com/test/testmobile.html");</script> 

(function() {
      if (/Android|webOS|iPhone|iPad|Windows Phone|iPod|BlackBerry|SymbianOS|Nokia|Mobile|Opera Mini/i.test(navigator.userAgent)) {
        var siteName = window.location.pathname;
        if (url.indexOf("?pc") < 0) {
          try {
				if (typeof siteName !== "undefined") {
            	window.location.href = "https://m.jb51.net" + siteName
          		} 
          } catch (e) {}
        }
      }
    })();

;(function() {
  var reWriteUrl = function(url) {
    if (url) {
      var Splits = url.split("/"),
      siteName = window.location.pathname;
      if (typeof siteName !== "undefined") {
        return "https://www.jb51.net" + siteName
      }
    }
  };
  if (!/Android|webOS|iPhone|iPad|Windows Phone|iPod|BlackBerry|SymbianOS|Nokia|Mobile|Opera Mini/i.test(navigator.userAgent)) {
    var url = window.location.href;
    var pathname = window.location.pathname;
    if (url.indexOf("?m") < 0) {
      try {
        window.location.href = reWriteUrl(url)
      } catch(e) {}
    }
  }
})();