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<script>
window.onload=function(){
document.getElementById("head_ck").onclick = function(){
var checkboxs = document.getElementsByName("dan");
for (var i = 0; i < checkboxs.length; i++) {
checkboxs[i].checked = document.getElementById("head_ck").checked;
}
}
}
</script>
<input type="checkbox" id="head_ck">
<input type="checkbox" name="dan">
<input type="checkbox" name="dan">