How to dynamically add option to select using js (detailed tutorial)

Below I will share with you a method of using js to dynamically add options to datalist or select. It has a good reference value and I hope it will be helpful to everyone.

Sometimes it is necessary to read information from the configuration file and then add it to the user's options, such as the option option of select. Here is an example for such a situation

The content is as follows:

     
  选择城市:
    

The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.

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