join("&nbsp")

这样就可以了

myarr.join(" ");

object.join(" ");空格作为分割符

<script type="text/javascript">

    var myarr1= new Array("86","010")

    var myarr2= new Array("84697581");

    var myarr3= myarr1.concat(myarr2);

    document.write(myarr3,"<br/>");

    document.write(myarr3.join(" "));

</script>