js中的push和join方法用法

<script type="text/javascript">
function delWork(id){
var boxes = document.getElementsByName("commonPage.idBox");
var selected = new Array();
for (var i=0; i<boxes.length; i++) {
if(boxes[i].checked){
//push()把一个元素添加到数组的尾部
selected.push(boxes[i].value);
}
}
// join()方法将数组中的所有元素转换成字符串，然后连接起来，这刚好和String的split()方法是一个相反的操作。join()默认是使用“,”作为分隔符，当然你也可以在方法中指定分隔符
var idStr = selected.join();
if(idStr == ''){
alert('还没有选择班次！');
return false;
}

if(confirm('确定要删除选中的记录?')){

var url = '${webRoot}/base/marquee/work-delete.action?commonPage.idBox='+idStr;
var myAjax = new Ajax.Request(url, {method:"post", onComplete:callback, asynchronous:true});

}
}

function callback(response){
alert(response.responseText);
//var url = "${webRoot}/base/marquee/work-queryWorks.action";
var url = "${webRoot}/base/marquee/workQuery.action";
window.location.href = url;

window.parent.document.getElementById("info").src = "";
}

</script>

转自： http://liminhappygirl.iteye.com/blog/1245041