打卡判断，增加前端浏览器mac获取，当mac获取为空时不判断

LR-20210131IOQH\Administrator

2021-06-10 6f34ab1ed6f8cb79a012a30a7b687e362c6f16c2

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.passwordbox-open {
  background: url('images/passwordbox_open.png') no-repeat center center;
}
.passwordbox-close {
  background: url('images/passwordbox_close.png') no-repeat center center;
}