<input type="checkbox" name="cb" value="1" />aa
<input type="checkbox" name="cb" value="2" />bb
<input type="checkbox" name="cb" value="3" />cc
<input type="checkbox" name="cb" value="4" />dd
<br/>
<input type="button" value="提交" onclick="checkedValues()" />

function checkedValues(){
var arr=new Array();
var checkbox=document.getElementByName('cb');
for(var i=0;i<checkbox.length();i++){
if(checkbox[i].checked==true){
arr.push(checkbox[i].value);
alert(checkbox[i].value);
}
}
}