Detailed explanation of the steps to implement drop-down box linkage with JS

This time I will bring you a detailed explanation of the steps to implement drop-down box linkage with JS. What are the precautions for JS to implement drop-down box linkage? The following is a practical case, let's take a look.

  
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Use innerHTML,

IE browser does not support this method, so the improvement method is:

  
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Can be compatible with Firefox, IE, etc.

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

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