HTML联动下拉框的内容使用js显示到文本域textarea

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>textarea</title></head><body><form name="form" method="post" action="">  <p>    <select name="sel" id="sel_p" onchange="address(1,this);">      <option>江西省</option>      <option>广东省</option>      <option>辽宁省</option>    </select>  </p>  <p>    <select name="sel" id="sel_c" onchange="address(2,this);">      <option>樟树市</option>      <option>广州市</option>      <option>大连市</option>    </select>  </p>  <p>    <select name="sel" id="sel_z" onchange="address(3,this);">      <option>临江镇</option>      <option>海珠区</option>      <option>金州区</option>    </select>  </p>  <p>    <textarea id="outPut" name="outPut"></textarea>  </p></form></body><script language="javascript" type="text/javascript">function address(num,v_sel){    var x_p =  document.getElementById("sel_p").value;    var x_c =  document.getElementById("sel_c").value;    var x_z =  document.getElementById("sel_z").value;        if(x_p && x_c && x_z){      document.getElementById("outPut").value = x_p + x_c + x_z;    }}</script></html>

效果如下

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