Javascript基础教程之argument 详解

<script type="text/javascript">
    function sayHello () {
        if (arguments[0] == "bye")
        return;
        else
       alert( "hello" + arguments[0]);

    }
</script>

<script type="text/javascript">
    function cNumbArg () {
        return arguments.length;
    }
    document.write(cNumbArg(25,2255,"您好")+"<br>");//返回3
    document.write(cNumbArg()+"<br>");//0
    document.write(cNumbArg(1111)+"<br>");//1
</script>

<script type="text/javascript">
    function fnAdd () {
        if (arguments.length == 0)
        return;
        else if (arguments.length == 1)
         return  arguments[0] + 5;
        else (arguments.length >1 )
        var iSum  =0
        for(var i=0;i< arguments.length;i++)
       iSum += arguments[i];
        return iSum;
    }
    document.write(fnAdd(5)+"<br>");
    document.write(fnAdd(10)+"<br>");
    document.write(fnAdd(10,20)+"<br>");
    document.write(fnAdd(10,20,30,40)+"<br>");
</script>