Implementation method of js secondary region selection_javascript skills

To realize the selection of secondary regions, there are roughly two forms of expression on the front end. First, you put two text boxes. When you click on the first text box, a list of provinces appears. When you click on the second text box, the list of the province appears. Urban list; the second is to put two drop-down boxes, select one in the first drop-down box, and then select the corresponding urban area in the second drop-down box. Of course, there are other ways, I will do one here, That is, the drop-down selection, the code is as follows:
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Copy code The code is as follows:

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本来の目的 このデモではループを使用して配列を生成しますが、よく考えてください。これはセカンダリ リージョンのカスケードであるため、誰でも明確に見えるように、より標準化された方がよいでしょう。と選択が明確になりましたが、この記事はほとんどが地名です。