无法将JSON解析为Javascript对象

I have this HTML box:

我有这个HTML框:

<span>Select depatament</span><span>
    <select id="department" onchange="EnableSlaveSelectBox(this)" data-slaveelaments='{"a": 1, "b": "2"}'>
       <option selected disabled>-Select-</option>
    </select>
</span>
<span>Sele