我的js代码如下，if后面的语句永远等不到执行，请问怎么破？

<script type="text/javascript"> $(document).ready(function(){ window.localStorage.checkInDate=null; window.localStorage.checkOutDate=null; $("#test1").html(window.localStorage.checkInDate); $("#test2").html(window.localStorage.checkOutDate); $("span").bind("click",function(){ $("#test1").html("hello"); if (window.localStorage.checkInDate==null) { window.localStorage.checkInDate = $(this).attr("title"); $("#test1").html(window.localStorage.checkInDate); } else { window.localStorage.checkOutDate = $(this).attr("title"); $("#test2").html(window.localStorage.checkOutDate); } }); }); </script>

 var a = {};  
 window.localStorage.checkInDate = a;   
 window.localStorage.checkOutDate = null;                   
 console.log(window.localStorage.checkInDate);  // "[Ojbect Ojbect]"
 console.log(window.localStorage.checkOutDate); // "null"   
 console.log(typeof (window.localStorage.checkInDate));  // string
 console.log(typeof (window.localStorage.checkOutDate)); // string