当客户端无法访问google时候,用bing 代替google 来搜索

controllers/search.js

@@ -1,5 +1,9 @@
 exports.index = function (req, res, next) {
   var q = req.query.q;
   q = encodeURIComponent(q);
-  res.redirect('https://www.google.com.hk/#hl=zh-CN&q=site:cnodejs.org+' + q);
+  if(req.query.notGG){
+    res.redirect('https://cn.bing.com/search?q=site:cnodejs.org+' + q)
+  }else{
+    res.redirect('https://www.google.com.hk/#hl=zh-CN&q=site:cnodejs.org+' + q);
+  }
 };

test/controllers/search.test.js

@@ -10,4 +10,12 @@ describe('test/controllers/search.test.js', function () {
         done(err);
       });
   });
+  it('should redirect to bing search when google is not reacheable', function (done) {
+    request.get('/search').query({q: 'node 中文',notGG:'1'})
+      .expect(302)
+      .end(function (err, res) {
+        res.headers['location'].should.equal('https://cn.bing.com/search?q=site:cnodejs.org+node%20%E4%B8%AD%E6%96%87');
+        done(err);
+      });
+  });
 });

views/layout.html

@@ -77,6 +77,7 @@
 
       <form id='search_form' class='navbar-search' action="/search">
         <input type='text' id='q' name='q' class='search-query span3' value=''/>
+        <input type='hidden' id='notGG' name='notGG' value='' />
       </form>
       <ul class='nav pull-right'>
         <li><a href='/'>首页</a></li>
@@ -146,8 +147,33 @@
   ga('create', '<%-config.google_tracker_id%>', 'auto');
   ga('send', 'pageview');
 </script>
+
 <% } %>
 
+<script>
+  function checkSiteReachable(url,callback) {
+      var timer = setTimeout(function(){
+          callback(false);
+      },2000)
+
+      var img = document.createElement("img");
+      img.onload = function() {
+          clearTimeout(timer);
+          callback(true);
+      }
+      img.onerror = function() {
+          clearTimeout(timer);
+          callback(false);
+      }
+      img.src = url+"/favicon.ico";
+  }
+  checkSiteReachable('https://www.google.com',function(reachable){
+    if(!reachable){
+      document.querySelector('#notGG').value = '1';
+    }
+  })
+</script>
+
 <% if (config.cnzz_tracker_id) { %>
 <div style="display:none;">
   <script src="//s95.cnzz.com/z_stat.php?id=<%- config.cnzz_tracker_id %>&web_id=<%- config.cnzz_tracker_id %>" language="JavaScript"></script>