div中的div上下居中

方法1:

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.parent {
          width:800px;
          height:500px;
          border:2px solid #000;
          position:relative;
}
 .child {
            width:200px;
            height:200px;
            marginauto;  
            positionabsolute;  
            top0left0bottom0right0
            background-colorred;
}

方法2:

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.parent {
            width:800px;
            height:500px;
            border:2px solid #000;
            display:table-cell;
            vertical-align:middle;
            text-aligncenter;
        }
        .child {
            width:200px;
            height:200px;
            display:inline-block;
            background-colorred;
        }

方法3:

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.parent {
            width:800px;
            height:500px;
            border:2px solid #000;
            display:flex;
            justify-content:center;
            align-items:center;
        }
        .child {
            width:200px;
            height:200px;
            background-colorred;
        }

方法4:

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.parent {
            width:800px;
            height:500px;
            border:2px solid #000;
            position:relative;
        }
        .child {
            width:300px;
            height:200px;
            margin:auto;
            position:absolute;/*设定水平和垂直偏移父元素的50%,
再根据实际长度将子元素上左挪回一半大小*/
            left:50%;
            top:50%;
            margin-left-150px;
            margin-top:-100px;
            background-colorred;
        }
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