浙江师范大学-网络继续教育学院-视频连播

浙江师范大学-网络继续教育学院-视频连播！

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Review: OK - script works, but has bugs

bingtuan
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Posted: 14 Desember 2022
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kecheng(course)

let over = course.getElementsByClassName("progress-bar")[0];语句错误，Uncaught TypeError: Cannot read properties of null (reading 'getElementsByClassName')

如在控制台测试，正常，看语句也是在window.onload之后调用的啊，为什么啊，望大神解决

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