JavaScript implements three-level cascading special effects example sharing

This article mainly introduces JavaScript to implement three-level cascading special effects. Select the provincial capital and the corresponding county drop-down box will appear. At the same time, the city drop-down box will change. It has certain reference value. Interested friends can refer to it. I hope it can help. to everyone.

     
    　　//onchange():控件的value值改变后调用方法  ----省份--- 浙江省 河南省   ---市区---   ---县区---   

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