<center>
<iframe  id="14012015" name="14012015" allowfullscreen="" frameborder="0" height="300" src="//www.youtube.com/embed/UtCLlQp5r90?autoplay=0;playlist=UtCLlQp5r90;loop=1;rel=0" width="500"></iframe>
</center>
<script>
window.onresize= A14012015;
window.onload= A14012015;
function A14012015(){
mp4ww=document.documentElement.clientWidth;
document.getElementById('14012015').width=mp4ww-450+"xp";
document.getElementById('14012015').height=(mp4ww-450)/1.7+"xp";
}
A14012015();
</script>

| YouTube | 自動改變螢幕大細 | iframe | document.documentElement | document.getElementById(id) | window.onresize | window.onload | center | script |