function wc1()
{ var coffee = document.forms[0].DW1
var txt = ""
alert (coffee.length);
for (i=0; i<coffee.length; ++i)
{
if (coffee[i].checked)
{
txt = txt + coffee[i].value;
}
}
document.getElementById("order1").innerHTML = "已完成项目:" + txt;
}
var coffee = document.forms[0].DW1是什么意思?
为什么alert (coffee.length);没有返回任何信息?