的clientWidth我想則firstChild的客戶寬度如何獲得則firstChild
的CSS
.ot{width:100px;height:200px}
JS
var ra = document.getElementsByClassName("r")[0];
var n = ra.firstChild.clientHeight;
var ca = n ;
HTML
<div class="r"><div class="ot"></div></div>
希望通過r
類,爲什麼不ca
正顯示出200
w3schools.com/code/tryit.asp?filename=FATMX1JOJKP1 undefined – Anjali