js实现图片的闪烁

<script>
var pic = document.getElementsByTagName('img')[0];
var status = 1;
function run()
{

    if (status == 1) {
        pic.style.display = 'block';
        status = 0;
    } else {
        pic.style.display = 'none';
        status = 1;
    }

}

setInterval('run()',100);

</script>