javascript限制所选个数
<script>
var max =3
var j = 0;
function chk(obj1){
var obj = document.getElementsByName(obj1.name);
if(obj1.checked){
j++;
if(j==max){
for (i = 0; i < obj.length; i++){
if(obj[i].checked==false){
obj[i].disabled=true;
}
}
}
}
else{
j--;
for(var i=0;i <obj.length;i++){
if(obj[i].disabled==true){
obj[i].disabled=false;
}
}
}
}
</script>
<INPUT type= "checkbox " name= "uid1 " value= "1 " onClick= "chk(this); ">
<INPUT type= "checkbox " name= "uid1 " value= "2 " onClick= "chk(this); ">
<INPUT type= "checkbox " name= "uid1 " value= "3 " onClick= "chk(this); ">
<INPUT type= "checkbox " name= "uid1 " value= "4 " onClick= "chk(this); ">
<INPUT type= "checkbox " name= "uid1 " value= "5 " onClick= "chk(this); ">
- 51.la

招生简章


