Javascript supports the drop-down menu of province/city level 2 Association for area code input

The provincial/municipal level 2 linkage drop-down menu adds area code input. multiple sets of options share a group of data.
Select a region to obtain the region code. Enter the region code to automatically select a region.
The District codes of some cities are being collected.
<Select name = azone id = "azone" onChange = "this. value = this. options [this. selectedIndex]. value; altcls (); inps. value = optn. options [0]. value; "> <option value =" Province "disabled =" disabled "> province </option> </select> <select name = cls id =" cls "onChange =" if (this. options [0]. text! = 'Select City') inps. value = this. options [this. selectedIndex]. value; "> <option value = 0> select city </option> </select> <input type =" text "id =" inps "name =" inps "size =" 5" value = "" onkeyup = "if (this. value. length> 1) inti (0); findarea (); "> <select name = azone id =" azone1 "onChange =" this. value = this. options [this. selectedIndex]. value; altcls (); inps. value = optn. options [0]. value; "> <option value =" Province "disabled =" disabled "> province </option> </Select> <select name = cls id = "cls1" onChange = "if (this. options [0]. text! = 'Select City') inps. value = this. options [this. selectedIndex]. value; "> <option value = 0> select city </option> </select> <input type =" text "id =" inps1 "name =" inps "size =" 5" value = "" onkeyup = "if (this. value. length> 1) inti (1); findarea (); ">
[Ctrl + A select all Note: If you need to introduce external Js, You need to refresh it to execute]