jquery操作数据，写入json类型的变量

<ul>
    <li class="_photo-item" data-type="a" data-path="0">1</li>
    <li class="_photo-item" data-type="b" data-path="1">1</li>
    <li class="_photo-item" data-type="c" data-path="2">1</li>
    <li class="_photo-item" data-type="d" data-path="3">1</li>
    <li class="_photo-item" data-type="e" data-path="4">1</li>
    <li class="_photo-item" data-type="f" data-path="5">1</li>
    <li class="_photo-item" data-type="g" data-path="6">1</li>
    <li class="_photo-item" data-type="h" data-path="7">1</li>
    <li class="_photo-item" data-type="i" data-path="8">1</li>
    <li class="_photo-item" data-type="g" data-path="9">1</li>
</ul>
<script type="text/javascript">
    $(function () {
        var suns = $('._photo-item').length;
        var employees =[
                {"paths":" ","types":" "},
            ];
        console.log(employees);
        for (var i = 0; i < suns; i++) {
            employees[i].paths = $('._photo-item').eq(i).data('path');
            employees[i].types = $('._photo-item').eq(i).data('type');
            console.log("是否循环:"+i);
        };  
        console.log(employees); 
    })
</script>

为什么，i只循环了一次，只写入了第一次的数据。
而且报错，paths为空