输入完密码按Enter完成登录

jsp代码：
<dl>
            <dt>密码</dt>
            <dd class="mt5">
            <input id="pwd" type='password'  name='j_password' onkeydown='test(this.form,event)'  autocomplete="off" class="ipt ipt-password" tabindex="2" onload="this.value=''"/>
             <div id="pas" class="error"></div>
            </dd>
          </dl>

js端代码：

function test(frm,event){
    var event=window.event?window.event:event; if(event.keyCode==13){
      frm.submit();
    }
  }