JUQERY的问题，帮我看看，那里错了
var arr={7,8,9};
  $.each(arr,function(item) { alert(item); });


var arr={"tou";30,"joy";20,"lily";40};
$.each(arr,function(key,value){alert(key+""+value);});



在vs2010上一直没调试成功，是什么原因，帮我看看吧

------解决方案--------------------
你应该这样
<script>
var arr=[7,8,9];//定义数组，{}是定义对象
$.each(arr,function(item) { alert(this + " = " + item); });


var arr2={"tou":30,"joy":20,"lily":40};//定义对象是:而不是;
$.each(arr2,function(key,value){alert(key+" = "+value);});
</script>

------解决方案--------------------
var arr=[7,8,9];
$.each(arr,function(item) { alert(arr[item]); });


var arr={"tou":30,"joy":20,"lily":40};
$.each(arr,function(key,value){alert(key+""+value);});

看一下Javascript: The Good Parts这本书，里面对javascript的数组有详细的分析