弹出新窗口输入返回到原页面

a.html

<script>
 function openOther(v){
  var w = showModalDialog("b.html");
  v.val.value=w; 
 }
</script>

<form>
 <input name="val">
 <input type="button" onclick="openOther(this.form);" value="click">
</form>

<script>
 function sopen(vv){
  var w = showModalDialog("b.html");
  w = w + "";
  if( w != "undefined" ){
   vv.v.value = w;
  }
  
 }
</script>

<form>
 <input name="v">
 <input type="button" onclick="sopen(this.form);" value="open">
</form> 

 

b.html

<script>
 function returnText(v){
  window.returnValue = v.val.value;
  window.close(); 
 }
</script>

<form>
 <input name="val">
 <input type="button" onclick="returnText(this.form);" value="return">
</form>