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Day390：下面的代码有什么问题？怎么优化？ #393

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qappleh opened this issue Sep 3, 2021 · 1 comment

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js

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qappleh commented Sep 3, 2021

// what's wrong here?
let noscript = document.getElementById('noscript');
noscript.innerHTML = '<p>Please enable JavaScript.</p>';
document.body.appendChild(noscript);

注：本题转自推特一国外的小哥。

The text was updated successfully, but these errors were encountered:

qappleh added the js label

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qappleh commented Sep 6, 2021

1、使用DOM没有判空；
2、id和变量名不应该使用html标签，命名不规范；
3、不能对为空或null的dom使用innerHTML属性；
4、appendChild()方法的参数不能是空或null；

可以在浏览器运行一下，看一下报错！

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