ShowHide Password When Checkbox in Checked using JavaScript

JavaScript
function changeType()
{
}

Password TextBox
form name="myform" action="#" method="post"
input type = "password" class="form-control" name="password" id = "pass" class="pass" required="" placeholder = "" style = "height:50px;width:330px;font-size: 40px;"

CheckBox
input type = "checkbox" name = "show" style = "height:60px;width:19px; font-size: 18px;" value='0' onchange="changeType()"
/form