javascript 未捕获的类型错误：无法读取 null 的属性“clientHeight”
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时间：2020-10-27 20:23:44 来源:igfitidea点击:
Uncaught TypeError: Cannot read property 'clientHeight' of null
提问by dillonbrannick
I don't know why it can't find the height. Any help would be appreciated.
我不知道为什么它找不到高度。任何帮助，将不胜感激。
var h = document.getElementById('big_button').clientHeight,
center = -h / 2;
window.onload = function () {
document.getElementById('big_button_container2').style.marginTop = 'center';
};
采纳答案by Andrew Robinson
You can use document.getElementsByClass instead as you have only elements with class names not IDs.
您可以改用 document.getElementsByClass，因为您只有具有类名而不是 ID 的元素。
i.e.
IE
var h = document.getElementsByClassName('big_button')[0].clientHeight,
center = -h / 2;
window.onload = function () {
document.getElementsByClassName('big_button_container2')[0].style.marginTop = 'center';
};
