图片大于div时的居中显示

当图片大于div时，想要图片居中显示，如果图片等比例缩小可能会导致图片不能填充整个div，如果直接将图片不设置宽高，将其外层div设置overflow:hidden；这时即使外层div设置了水平垂直居中，图片也不是居中的效果：

解决方法：

1- 把图片设置为背景图片

1 2	`<div` `class="face-img-contain"` `id="face-img-back">` `</div>`

.face-img-contain{
    width:348px;
    height:436px;
    margin:0 auto;
    margin-top: 14px;
    position: relative;
    background-image: url(../images/face-img/test-22.png); 
    background-repeat: no-repeat;
    background-position: center;
    background-size: cover;
    display: flex;
    justify-content: center;
    align-items: center;
    border: 1px solid gainsboro;
}

1 2	`若是后台返回的地址，别忘了拼接方法正确` `$("#face-img-back").css("background-image","url("+faceImg+")");`

2- 给图片设置相对div的100%的宽高，再设置object-fit:cover;

<div class="face-img-contain-new-new">
    <img src="../images/face-img/test-22.png" alt="" class="face-img-defined1" id="face-img-photo">
</div>
 
.face-img-contain-new-new{
    width:348px;
    height:436px;
    margin:0 auto;
    margin-top: 14px;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    border: 1px solid gainsboro;
}
.face-img-defined1{
    width:100%;
    height:100%;
    object-fit: cover;
}