javascript - addClass("test") give error: TypeError: undefined is not a function -

in console have:

$(".mycssclass")[0].parentnode <li><span class="mycssclass">some text</span></li>

i want add css class parent span, tag <li>

i tried this:

$(".mycssclass")[0].parentnode.addclass("test") typeerror: undefined not function

i use jquery 1.5.2

addclass method of jquery objects. when use $(".mycssclass")[0], have real element, not jquery wrapper.

then, can:

wrap jquery object again:

$($(".mycssclass")[0].parentnode).addclass("test")

only work jquery objects:

$(".mycssclass").eq(0).parent().addclass("test")

add class plain javascript (not supported on old browsers):
```
$(".mycssclass")[0].parentnode.classlist.add("test") 
```

GHI