Code Tạo button ẩn hiện nội dung

<div>
<div>
<input type="button" value="Xem" style="width:75px; font-size:11px; margin:0px; padding:4px; border="1"" onclick="if (this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display != '') { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = '';this.innerText = ''; this.value = 'Ẩn'; } else { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = 'none'; this.innerText = ''; this.value = 'Xem'; }">
</div>
<div>
<div style="display: none;  border:#4F4F4F 1px solid; padding: 4px; background:# ">


NỘI_DUNG 

</div>
</div>
</div>

Ví dụ:

    

NỘI_DUNG