event.currentTarget的值是null

用的浏览器是chrome 50,其实firefox上也测试过了.先看代码

<ul>
    <li>1</li>
    <li>2</li>
    <li class="ok">3</li>
</ul>
<script>
    document.querySelector('.ok').addEventListener('click', function (ev) {
        console.log('ev is: ');
        console.log(ev);
        console.log('event.currentTarget is: ');
        console.log(ev.currentTarget)
    });
</script>

问题的奇葩在于,打印出来的ev对象,可以看到currentTarget的值是null,但是直接访问的话,却发现他其实是由值的,这是为啥呢?

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http://stackoverflow.com/questions/26496176/when-loggin-an-event-object-currenttarget-is-null-but-when-logging-event-curre

看看