关闭窗口时防止出现“没有权限”的错误

                  <script>
                    function closewin(){
                     window.close();
                    }
                    function ignoreError() {
                     window.close();
             return true;
           }            
           window.onerror = ignoreError;
                  </script>
                  <INPUT class="sub2" type="submit" size=3 value="还要去逛逛" name="Submit1" onClick="closewin()">