路由模块router实现step1

时间：2023-12-27 13:43:37

hashchange事件

需要解决的问题：
1.IE6/7及兼容模式下的IE8不支持onhashchange事件，（而且hash改变不会产生history）
    解决办法：用定时器来检测hash的变化；用隐藏的iframe调用document.write方法来产生历史；
2.hash的提取有兼容性问题：
   * IE6会取少一总分hash，
     如http://www.cnblogs.com/rubylouvre#stream/xxxxx?lang=zh_c
     IE6 > location.hash = #stream/xxxxx
     其他浏览器 > location.hash = #stream/xxxxx?lang=zh_c
   * firefox会对hash进行decodeURIComponent
     比如 http://www.cnblogs.com/rubylouvre/#!/home/q={%22thedate%22:%2220121010~20121010%22}
     firefox 15 => #!/home/q={"thedate":"20121010~20121010"}
     其他浏览器 => #!/home/q={%22thedate%22:%2220121010~20121010%22}
3.html5 history api 兼容pushState与replaceState， 研究一下history.js
 <!DOCTYPE html>

 <html>

 <head>

     <meta charset="utf-8"/>

     <title></title>

 </head>

 <body>

 <a href="#a">a</a>

 <a href="#b">b</a>

 <a href="#c">c</a>

 <script src="http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.7.2.min.js"></script>

 <script>

     (function(global, $) {

         var hashchange = 'hashchange', doc = document, documentMode = doc.documentMode,

                 supportHashChange = ('on' + hashchange in window) && (documentMode === void 0 || documentMode > 7);

         var hash = '#', last_hash = getHash(), history_hash, timeoutID, delay = 50, iframe;

         function getHash(url) {

             url = url || doc.location.href;

             return '#' + url.replace(/^[^#]*#?(.*)$/, '$1');

         }

         //为了产生历史

         function setHistory(curHash, history_hash) {

             var d = iframe.document;

             if (curHash != history_hash) {

                 d.open();

                 d.write('<DOCTYPE html><html><body>' + curHash + '</body></html>');

                 d.close();

             }

         }

         function setup() {

             if (!supportHashChange) {//IE6.7及混杂模式下的IE8,不支持onhashchange事件，所以采用iframe+定时器模拟

                 if (!iframe) {

                     var $el = $('<iframe tabindex="-1" width="0" height="0" style="display:none" title="empty"></iframe>');

                     $el.appendTo(doc.body);

                     iframe = $el[0].contentWindow;

                     $el.on('load', function() {

                         $el.off('load');

                         var d = iframe.document;

                         d.open();

                         d.write('<DOCTYPE html><html><body>' + hash + '</body></html>');

                         d.close();

                         timeoutID = setInterval(poll, delay);

                     });

                 }

                 function poll() {

                     hash = getHash();

                     history_hash = iframe.document.body.innerText;

                     if (hash != last_hash) {//当前窗口的hash改变

                         //console.log('current hash:' + hash + ',last hash:' + last_hash);

                         setHistory(last_hash = hash, history_hash);

                         //todo 在这里fire hashchange事件

                     } else if (history_hash != hash) {//如果按下回退健或前进健

                         //console.log('history hash:' + history_hash + ',current hash:' + hash)

                         location.href = location.href.replace(/#.*/, '') + history_hash;

                     }

                 }

             }

         }

         setup();

     })(window, $);

 </script>

 </body>

 </html>

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