<script>function ArgTest(){
var i, s, numargs = arguments.length;
if (numargs < 3)
alert(arguments[0])
else
alert(arguments[2])
}
ArgTest("a","b","c")
ArgTest("a","b")
</script>
var i, s, numargs = arguments.length;
if (numargs < 3)
alert(arguments[0])
else
alert(arguments[2])
}
ArgTest("a","b","c")
ArgTest("a","b")
</script>
function ArgTest(){
var i, c, numargs = arguments.length;
if (numargs < 3)
c=1
else
c=arguments[2]
alert(c)
}
ArgTest("a","b",32323)
ArgTest("a","b")
</script>
function vars(a){
b = a || '没输入参数';
alert(b);
}
</script>