Javascript中的arguments 对象

function fn(a,b,c)
{
    var s = "";
    var i;
    s += "函数传入参数个数:" + fn.arguments.length + "/n";
    for (i=0;i<fn.arguments.length;i++)
    {
        s += "函数传入参数" + i +":" + fn.arguments[i] + "/n";
    }
    s += "函数实际参数个数:" + fn.arguments.callee.length + "/n";
    document.all.t.innerText = s
}