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<script>
function checkbox()
{
var str=document.getElementsByName("box");
var objarray=str.length;
var chestr="";
for (i=0;i<objarray;i++)
{
if(str[i].checked == true)
{
chestr+=str[i].value+",";
}
}
if(chestr == "")
{
alert("ÇëÏÈÑ¡Ôñ¸´Ñ¡¿ò¡«£¡");
}
else
{
alert("¸´Ñ¡¿òµÄÖµÊÇ£º"+chestr);
}
}
</script>
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