How to make a checkbox select only one item_javascript skills

In js:

Copy code The code is as follows:

function chooseOne(chk){
//First get the collection object of chekcBox with the same name
var obj = document.getElementsByName("chk");
for (i=0; i//Judge Whether the i element in the obj collection is cb, if not it means it has not been selected
if (obj[i]!=chk) obj[i].checked = false;
//To check at least one If so, remove the else line above and replace it with the following line
else obj[i].checked = true;
}
}

jsp page:

Copy code The code is as follows: