我这个哪里错了?
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>挑战题</title>
</head>
<body>
<button id="demo">加载</button>
<div id="ab"></div>
<script>
var arr=[
{name:"mike",sex:"man",age:"10"},
{name:"july",sex:"man",age:"10"},
{name:"james",sex:"man",age:"10"}];
$("#demo").bind("click",function()
{
$.each(arr,function()
{
$("#ab").append($(this).name+$(this).sex+$(this).age);
})
})
</script>
</body>
</html>